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Chen, Junjie 3de6842994 DCS UMN 20240521 version 
Reviewed-by: Mützel, Andrea <andrea.muetzel@t-systems.com>
Co-authored-by: Chen, Junjie <chenjunjie@huawei.com>
Co-committed-by: Chen, Junjie <chenjunjie@huawei.com>
2024-07-05 08:59:46 +00:00

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[
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Service Overview",
"uri":"dcs-pd-0326001.html",
"doc_type":"usermanual",
"p_code":"",
"code":"1"
},
{
"desc":"Distributed Cache Service (DCS) is an online, distributed, in-memory cache service compatible with Redis. It is reliable, scalable, usable out of the box, and easy to man",
"product_code":"dcs",
"title":"What Is DCS?",
"uri":"en-us_topic_0054235826.html",
"doc_type":"usermanual",
"p_code":"1",
"code":"2"
},
{
"desc":"Many large-scale e-commerce websites and video streaming and gaming applications require fast access to large amounts of data that has simple data structures and does not",
"product_code":"dcs",
"title":"Application Scenarios",
"uri":"dcs-pd-0326002.html",
"doc_type":"usermanual",
"p_code":"1",
"code":"3"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"DCS Instance Types",
"uri":"dcs-pd-200312001.html",
"doc_type":"usermanual",
"p_code":"1",
"code":"4"
},
{
"desc":"A single-node DCS Redis instance has only one node and does not support data persistence. They are suitable for cache services that do not require data reliability.You ca",
"product_code":"dcs",
"title":"Single-Node Redis",
"uri":"CacheSingleNode.html",
"doc_type":"usermanual",
"p_code":"4",
"code":"5"
},
{
"desc":"This section describes master/standby DCS Redis instances.You cannot upgrade the Redis version for an instance. For example, a master/standby DCS Redis 4.0 instance canno",
"product_code":"dcs",
"title":"Master/Standby Redis",
"uri":"CacheMasterSlave.html",
"doc_type":"usermanual",
"p_code":"4",
"code":"6"
},
{
"desc":"DCS for Redis provides Proxy Cluster instances, which use Linux Virtual Server (LVS) and proxies to achieve high availability. Proxy Cluster instances have the following ",
"product_code":"dcs",
"title":"Proxy Cluster Redis",
"uri":"CacheCluster.html",
"doc_type":"usermanual",
"p_code":"4",
"code":"7"
},
{
"desc":"Redis Cluster DCS instances use the native distributed implementation of Redis. Redis Cluster instances have the following features:They are compatible with native Redis ",
"product_code":"dcs",
"title":"Redis Cluster",
"uri":"CacheProxy.html",
"doc_type":"usermanual",
"p_code":"4",
"code":"8"
},
{
"desc":"Table 1 describes the differences between different Redis instance types in terms of features and commands.",
"product_code":"dcs",
"title":"Comparing DCS Redis Instance Types",
"uri":"dcs-pd-191224001.html",
"doc_type":"usermanual",
"p_code":"4",
"code":"9"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"DCS Instance Specifications",
"uri":"en-us_topic_0054235835.html",
"doc_type":"usermanual",
"p_code":"1",
"code":"10"
},
{
"desc":"This section describes DCS Redis 3.0 instance specifications, including the total memory, available memory, maximum number of connections allowed, maximum/assured bandwid",
"product_code":"dcs",
"title":"Redis 3.0 Instance Specifications",
"uri":"dcs-pd-0916001.html",
"doc_type":"usermanual",
"p_code":"10",
"code":"11"
},
{
"desc":"This section describes DCS Redis 4.0 and 5.0 instance specifications, including the total memory, available memory, maximum number of connections allowed, maximum/assured",
"product_code":"dcs",
"title":"Redis 4.0 and 5.0 Instance Specifications",
"uri":"dcs-pd-0916002.html",
"doc_type":"usermanual",
"p_code":"10",
"code":"12"
},
{
"desc":"This section describes DCS Redis 6.0 instance specifications, including the total memory, available memory, maximum number of connections allowed, maximum/assured bandwid",
"product_code":"dcs",
"title":"Redis 6.0 Instance Specifications",
"uri":"dcs-pd-0916004.html",
"doc_type":"usermanual",
"p_code":"10",
"code":"13"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Command Compatibility",
"uri":"dcs-pd-200312003.html",
"doc_type":"usermanual",
"p_code":"1",
"code":"14"
},
{
"desc":"DCS for Redis 3.0 is developed based on Redis 3.0.7 and is compatible with open-source protocols and commands.This section describes DCS for Redis 3.0's compatibility wit",
"product_code":"dcs",
"title":"Redis 3.0 Commands",
"uri":"dcs-pd-200713005.html",
"doc_type":"usermanual",
"p_code":"14",
"code":"15"
},
{
"desc":"DCS for Redis 4.0 is developed based on Redis 4.0.14 and is compatible with open-source protocols and commands.This section describes DCS for Redis 4.0's compatibility wi",
"product_code":"dcs",
"title":"Redis 4.0 Commands",
"uri":"dcs-pd-200916001.html",
"doc_type":"usermanual",
"p_code":"14",
"code":"16"
},
{
"desc":"DCS for Redis 5.0 is developed based on Redis 5.0.14 and is compatible with open-source protocols and commands.This section describes DCS for Redis 5.0's compatibility wi",
"product_code":"dcs",
"title":"Redis 5.0 Commands",
"uri":"dcs-pd-200813002.html",
"doc_type":"usermanual",
"p_code":"14",
"code":"17"
},
{
"desc":"DCS for Redis 6.0 is compatible with Redis 6.2.7 and with open-source protocols and commands.This section describes DCS for Redis 6.0's command compatibility, including s",
"product_code":"dcs",
"title":"Redis 6.0 Commands",
"uri":"dcs-pd-210209002.html",
"doc_type":"usermanual",
"p_code":"14",
"code":"18"
},
{
"desc":"Web CLI is a command line tool provided on the DCS console. This section describes Web CLI's compatibility with Redis commands, including supported and disabled commands.",
"product_code":"dcs",
"title":"Web CLI Commands",
"uri":"dcs-pd-190826001.html",
"doc_type":"usermanual",
"p_code":"14",
"code":"19"
},
{
"desc":"Some Redis commands are supported by Redis Cluster DCS instances for multi-key operations in the same slot. For details, see Table 1.Some commands support multiple keys b",
"product_code":"dcs",
"title":"Command Restrictions",
"uri":"dcs-pd-200813003.html",
"doc_type":"usermanual",
"p_code":"14",
"code":"20"
},
{
"desc":"This section describes restrictions on some Redis commands.In case of a large amount of cached data, running the KEYS command may block the execution of other commands fo",
"product_code":"dcs",
"title":"Other Command Usage Restrictions",
"uri":"dcs-pd-200813004.html",
"doc_type":"usermanual",
"p_code":"14",
"code":"21"
},
{
"desc":"Whether you use DCS as the frontend cache or backend data store, DCS is always ready to ensure data reliability and service availability. The following figure shows the e",
"product_code":"dcs",
"title":"Disaster Recovery and Multi-Active Solution",
"uri":"GlobalDRPolicy.html",
"doc_type":"usermanual",
"p_code":"1",
"code":"22"
},
{
"desc":"When creating a DCS Redis instance, you can select the cache engine version and the instance type.VersionDCS supports Redis 3.0/4.0/5.0/6.0. The following table describes",
"product_code":"dcs",
"title":"Comparing Redis Versions",
"uri":"RedisDifference.html",
"doc_type":"usermanual",
"p_code":"1",
"code":"23"
},
{
"desc":"DCS supports single-node, master/standby, and cluster instances, ensuring high read/write performance and fast data access. It also supports various instance management o",
"product_code":"dcs",
"title":"Comparing DCS and Open-Source Cache Services",
"uri":"dcs-pd-0326003.html",
"doc_type":"usermanual",
"p_code":"1",
"code":"24"
},
{
"desc":"An instance is the minimum resource unit provided by DCS.For details, see DCS Instance Specifications and DCS Instance Types.Projects are used to group and isolate OpenSt",
"product_code":"dcs",
"title":"Basic Concepts",
"uri":"dcs-pd-200312004.html",
"doc_type":"usermanual",
"p_code":"1",
"code":"25"
},
{
"desc":"If you need to assign different permissions to employees in your enterprise to access your DCS resources, Identity and Access Management (IAM) is a good choice for fine-g",
"product_code":"dcs",
"title":"Permissions",
"uri":"dcs-pd-210626001.html",
"doc_type":"usermanual",
"p_code":"1",
"code":"26"
},
{
"desc":"DCS is used together with other services, including VPC, ECS, IAM, Cloud Eye, CTS, and Object Storage Service (OBS).A VPC is an isolated virtual network environment on th",
"product_code":"dcs",
"title":"Related Services",
"uri":"dcs-pd-0326006.html",
"doc_type":"usermanual",
"p_code":"1",
"code":"27"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Accessing DCS",
"uri":"en-us_topic_0054235836.html",
"doc_type":"usermanual",
"p_code":"1",
"code":"28"
},
{
"desc":"There are two ways to access DCS:Using the management consoleThe DCS provides a web-based management console. To launch the DCS console, create an account on the manageme",
"product_code":"dcs",
"title":"How to Access DCS",
"uri":"en-us_topic_0054235837.html",
"doc_type":"usermanual",
"p_code":"28",
"code":"29"
},
{
"desc":"The public cloud system provides two types of user permissions by default: user management and resource management.User management refers to the management of users, user",
"product_code":"dcs",
"title":"User Permissions",
"uri":"en-us_topic_0054247786.html",
"doc_type":"usermanual",
"p_code":"28",
"code":"30"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Permissions Management",
"uri":"dcs-ug-210626003.html",
"doc_type":"usermanual",
"p_code":"",
"code":"31"
},
{
"desc":"This chapter describes how to use IAM to implement fine-grained permissions control for your DCS resources. With IAM, you can:Create IAM users for employees based on your",
"product_code":"dcs",
"title":"Creating a User and Granting DCS Permissions",
"uri":"dcs-ug-210626004.html",
"doc_type":"usermanual",
"p_code":"31",
"code":"32"
},
{
"desc":"Custom policies can be created to supplement the system-defined policies of DCS. For the actions that can be added to custom policies, see section \"Permissions Policies a",
"product_code":"dcs",
"title":"DCS Custom Policies",
"uri":"dcs-ug-210626005.html",
"doc_type":"usermanual",
"p_code":"31",
"code":"33"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Getting Started",
"uri":"dcs-ug-0326007.html",
"doc_type":"usermanual",
"p_code":"",
"code":"34"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Creating an Instance",
"uri":"dcs-ug-0312003.html",
"doc_type":"usermanual",
"p_code":"34",
"code":"35"
},
{
"desc":"Before creating a DCS instance, identify your requirements and complete the following preparations:Decide on the required cache engine version.Different Redis versions ha",
"product_code":"dcs",
"title":"Identifying Requirements",
"uri":"PurchasePreparation.html",
"doc_type":"usermanual",
"p_code":"35",
"code":"36"
},
{
"desc":"To access DCS instances through a Virtual Private Cloud (VPC), create a VPC and configure security groups and subnets for it before using DCS. A VPC provides an isolated ",
"product_code":"dcs",
"title":"Preparing Required Resources",
"uri":"dcs-ug-0312004.html",
"doc_type":"usermanual",
"p_code":"35",
"code":"37"
},
{
"desc":"You can create one or more DCS Redis instances with the required computing capabilities and storage space based on service requirements.The system automatically schedules",
"product_code":"dcs",
"title":"Creating a DCS Redis Instance",
"uri":"dcs-ug-0326008.html",
"doc_type":"usermanual",
"p_code":"35",
"code":"38"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Accessing an Instance",
"uri":"dcs-ug-0916002.html",
"doc_type":"usermanual",
"p_code":"34",
"code":"39"
},
{
"desc":"Access a DCS Redis instance through redis-cli on an ECS in the same VPC. For more information on how to use other Redis clients, visit https://redis.io/clients.Redis 3.0 ",
"product_code":"dcs",
"title":"Accessing a DCS Redis Instance Through redis-cli",
"uri":"dcs-ug-0326009.html",
"doc_type":"usermanual",
"p_code":"39",
"code":"40"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Access in Different Languages",
"uri":"dcs-ug-0512002.html",
"doc_type":"usermanual",
"p_code":"39",
"code":"41"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Java",
"uri":"dcs-ug-211105003.html",
"doc_type":"usermanual",
"p_code":"41",
"code":"42"
},
{
"desc":"Access a DCS Redis instance through Jedis on an ECS in the same VPC. For more information about how to use other Redis clients, visit the Redis official website.Spring Da",
"product_code":"dcs",
"title":"Jedis",
"uri":"dcs-ug-0713005.html",
"doc_type":"usermanual",
"p_code":"42",
"code":"43"
},
{
"desc":"Access a DCS Redis instance through Lettuce on an ECS in the same VPC. For more information about how to use other Redis clients, visit the Redis official website.Spring ",
"product_code":"dcs",
"title":"Lettuce",
"uri":"dcs-ug-211105002.html",
"doc_type":"usermanual",
"p_code":"42",
"code":"44"
},
{
"desc":"Access a DCS Redis instance through Redisson on an ECS in the same VPC. For more information about how to use other Redis clients, visit the Redis official website.For Sp",
"product_code":"dcs",
"title":"Redisson",
"uri":"dcs-ug-211105004.html",
"doc_type":"usermanual",
"p_code":"42",
"code":"45"
},
{
"desc":"Access a DCS Redis instance through redis-py on an ECS in the same VPC. For more information about how to use other Redis clients, visit the Redis official website.Use re",
"product_code":"dcs",
"title":"Clients in Python",
"uri":"dcs-ug-0312011.html",
"doc_type":"usermanual",
"p_code":"41",
"code":"46"
},
{
"desc":"Access a DCS Redis instance through go-redis on an ECS in the same VPC. For more information about how to use other Redis clients, visit the Redis official website.A DCS ",
"product_code":"dcs",
"title":"go-redis",
"uri":"dcs-ug-211105001.html",
"doc_type":"usermanual",
"p_code":"41",
"code":"47"
},
{
"desc":"Access a DCS Redis instance through hiredis on an ECS in the same VPC. For more information about how to use other Redis clients, visit the Redis official website.The ope",
"product_code":"dcs",
"title":"hiredis in C++",
"uri":"dcs-ug-0312010.html",
"doc_type":"usermanual",
"p_code":"41",
"code":"48"
},
{
"desc":"Access a DCS Redis instance through C# Client StackExchange.Redis on an ECS in the same VPC. For more information about how to use other Redis clients, visit the Redis of",
"product_code":"dcs",
"title":"C#",
"uri":"dcs-ug-0312013.html",
"doc_type":"usermanual",
"p_code":"41",
"code":"49"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"PHP",
"uri":"dcs-ug-211202001.html",
"doc_type":"usermanual",
"p_code":"41",
"code":"50"
},
{
"desc":"Access a DCS Redis instance through phpredis on an ECS in the same VPC. For more information about how to use other Redis clients, visit the Redis official website.The op",
"product_code":"dcs",
"title":"phpredis",
"uri":"dcs-ug-0312009.html",
"doc_type":"usermanual",
"p_code":"50",
"code":"51"
},
{
"desc":"Access a DCS Redis instance through Predis on an ECS in the same VPC. For more information about how to use other Redis clients, visit the Redis official website.A DCS Re",
"product_code":"dcs",
"title":"Predis",
"uri":"dcs-ug-211202002.html",
"doc_type":"usermanual",
"p_code":"50",
"code":"52"
},
{
"desc":"Access a DCS Redis instance through Node.js on an ECS in the same VPC. For more information about how to use other Redis clients, visit the Redis official website.The ope",
"product_code":"dcs",
"title":"Node.js",
"uri":"dcs-ug-0312012.html",
"doc_type":"usermanual",
"p_code":"41",
"code":"53"
},
{
"desc":"Access a DCS Redis instance through Web CLI. This function is supported only by DCS Redis 4.0 and later instances, and not by DCS Redis 3.0 instances.Do not enter sensiti",
"product_code":"dcs",
"title":"Accessing a DCS Redis 4.0/5.0/6.0 Instance on the Console",
"uri":"dcs-ug-0312008.html",
"doc_type":"usermanual",
"p_code":"39",
"code":"54"
},
{
"desc":"On the DCS console, you can view DCS instance details.Search by keyword.If you do not select an attribute and enter a keyword in the search box, the system searches for i",
"product_code":"dcs",
"title":"Viewing Details of a DCS Instance",
"uri":"dcs-ug-0312016.html",
"doc_type":"usermanual",
"p_code":"34",
"code":"55"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Operating DCS Instances",
"uri":"dcs-ug-0312015.html",
"doc_type":"usermanual",
"p_code":"",
"code":"56"
},
{
"desc":"On the DCS console, you can scale a DCS Redis instance to a larger or smaller capacity.Modify instance specifications during off-peak hours. If the modification failed in",
"product_code":"dcs",
"title":"Modifying DCS Instance Specifications",
"uri":"dcs-ug-0326011.html",
"doc_type":"usermanual",
"p_code":"56",
"code":"57"
},
{
"desc":"On the DCS console, you can start one or multiple DCS instances at a time.This function is not supported by recent instances. You can only start old instances that have b",
"product_code":"dcs",
"title":"Starting DCS Instances",
"uri":"dcs-ug-0911001.html",
"doc_type":"usermanual",
"p_code":"56",
"code":"58"
},
{
"desc":"On the DCS console, you can restart one or multiple DCS instances at a time.After a single-node DCS instance is restarted, data will be deleted from the instance.While a ",
"product_code":"dcs",
"title":"Restarting DCS Instances",
"uri":"dcs-ug-0326013.html",
"doc_type":"usermanual",
"p_code":"56",
"code":"59"
},
{
"desc":"On the DCS console, you can delete one or multiple DCS instances at a time. You can also delete all instance creation tasks that have failed to run.After a DCS instance i",
"product_code":"dcs",
"title":"Deleting DCS Instances",
"uri":"dcs-ug-0326014.html",
"doc_type":"usermanual",
"p_code":"56",
"code":"60"
},
{
"desc":"On the DCS console, you can manually switch the master and standby nodes of a DCS instance. This operation is used for special purposes, for example, releasing all servic",
"product_code":"dcs",
"title":"Performing a Master/Standby Switchover for a DCS Instance",
"uri":"dcs-ug-0312017.html",
"doc_type":"usermanual",
"p_code":"56",
"code":"61"
},
{
"desc":"You can clear data of DCS Redis 4.0 and later instances on the console.Clearing instance data cannot be undone and cleared data cannot be recovered. Exercise caution when",
"product_code":"dcs",
"title":"Clearing DCS Instance Data",
"uri":"dcs-ug-0312018.html",
"doc_type":"usermanual",
"p_code":"56",
"code":"62"
},
{
"desc":"On the DCS console, you can export DCS instance information in full to an Excel file.",
"product_code":"dcs",
"title":"Exporting DCS Instance List",
"uri":"dcs-ug-0312019.html",
"doc_type":"usermanual",
"p_code":"56",
"code":"63"
},
{
"desc":"After creating a DCS Redis 4.0 or later instance, you can rename the following critical commands: Currently, you can only rename the COMMAND, KEYS, FLUSHDB, FLUSHALL, HGE",
"product_code":"dcs",
"title":"Command Renaming",
"uri":"dcs-ug-1009002.html",
"doc_type":"usermanual",
"p_code":"56",
"code":"64"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Managing DCS Instances",
"uri":"dcs-ug-0312022.html",
"doc_type":"usermanual",
"p_code":"",
"code":"65"
},
{
"desc":"In most cases, different DCS instance management operations cannot proceed concurrently. If you initiate a new management operation while the current operation is in prog",
"product_code":"dcs",
"title":"Configuration Notice",
"uri":"dcs-ug-0312023.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"66"
},
{
"desc":"You can modify the configuration parameters of your DCS instance to optimize DCS performance based on your requirements.For example, if you do not need data persistence, ",
"product_code":"dcs",
"title":"Modifying Configuration Parameters",
"uri":"dcs-ug-0312024.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"67"
},
{
"desc":"On the DCS console, after creating a DCS instance, you can modify the maintenance time window of the DCS instance on the instance's Basic Information page.At least one DC",
"product_code":"dcs",
"title":"Modifying Maintenance Time Window",
"uri":"dcs-ug-0312025.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"68"
},
{
"desc":"On the DCS console, after creating a DCS instance, you can modify the security group of the DCS instance on the instance's Basic Information page.You can modify the secur",
"product_code":"dcs",
"title":"Modifying the Security Group",
"uri":"dcs-ug-0312026.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"69"
},
{
"desc":"After you initiate certain instance operations such as modifying instance specifications and changing or resetting a password, a background task will start for the operat",
"product_code":"dcs",
"title":"Viewing Background Tasks",
"uri":"dcs-ug-0312028.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"70"
},
{
"desc":"You can view the data storage statistics of all nodes of a DCS Redis 3.0 Proxy Cluster instance. If data storage is unevenly distributed across nodes, you can scale up th",
"product_code":"dcs",
"title":"Viewing Data Storage Statistics of a DCS Redis 3.0 Proxy Cluster Instance",
"uri":"dcs-ug-0312029.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"71"
},
{
"desc":"Tags facilitate DCS instance identification and management.You can add tags to an instance when creating it or add, modify, or delete tags on the details page of a create",
"product_code":"dcs",
"title":"Managing Tags",
"uri":"TagManagement.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"72"
},
{
"desc":"This section describes how to query the shards and replicas of a DCS Redis 4.0/5.0/6.0 instance and how to manually promote a replica to master.Currently, this function i",
"product_code":"dcs",
"title":"Managing Shards and Replicas",
"uri":"dcs-ug-210107001.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"73"
},
{
"desc":"By performing big key analysis and hot key analysis, you will have a picture of keys that occupy a large space and keys that are the most frequently accessed.Notes on big",
"product_code":"dcs",
"title":"Analyzing Big Keys and Hot Keys",
"uri":"dcs-ug-190808001.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"74"
},
{
"desc":"There are two ways to delete a key in Redis.Use the DEL command to directly delete a key.Use commands such as EXPIRE to set a timeout on a key. After the timeout elapses,",
"product_code":"dcs",
"title":"Scanning Expired Keys",
"uri":"dcs-ug-210330002.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"75"
},
{
"desc":"DCS helps you control access to your DCS instances in the following ways, depending on the deployment mode:To control access to DCS Redis 3.0 instances, you can use secur",
"product_code":"dcs",
"title":"Managing IP Address Whitelist",
"uri":"dcs-ug-190812001.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"76"
},
{
"desc":"Redis logs queries that exceed a specified execution time. You can view the slow query log on the DCS console to identify performance issues.For details about the command",
"product_code":"dcs",
"title":"Viewing Redis Slow Queries",
"uri":"dcs-ug-190926001.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"77"
},
{
"desc":"You can create run log files on the DCS console to collect run logs of DCS Redis instances within a specified period. After the logs are collected, you can download the l",
"product_code":"dcs",
"title":"Viewing Redis Run Logs",
"uri":"dcs-ug-1009001.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"78"
},
{
"desc":"DCS Redis 6.0instances support SSL encryption to ensure data transmission security. This function is not available for other instance versions. RESP (REdis Serialization ",
"product_code":"dcs",
"title":"Configuring SSL",
"uri":"dcs-ug-023129.html",
"doc_type":"usermanual",
"p_code":"65",
"code":"79"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Backing Up and Restoring DCS Instances",
"uri":"dcs-ug-0312030.html",
"doc_type":"usermanual",
"p_code":"",
"code":"80"
},
{
"desc":"On the DCS console, you can back up and restore DCS instances.There is a small chance that inconsistent data could exist in a DCS instance owing to service system excepti",
"product_code":"dcs",
"title":"Overview",
"uri":"en-us_topic_0079835992.html",
"doc_type":"usermanual",
"p_code":"80",
"code":"81"
},
{
"desc":"On the DCS console, you can configure an automatic backup policy. The system then backs up data in your instances according to the backup policy.By default, automatic bac",
"product_code":"dcs",
"title":"Configuring an Automatic Backup Policy",
"uri":"dcs-ug-0312031.html",
"doc_type":"usermanual",
"p_code":"80",
"code":"82"
},
{
"desc":"You need to manually back up data in DCS instances in a timely manner. This section describes how to manually back up data in master/standby instances using the DCS conso",
"product_code":"dcs",
"title":"Manually Backing Up a DCS Instance",
"uri":"dcs-ug-0312032.html",
"doc_type":"usermanual",
"p_code":"80",
"code":"83"
},
{
"desc":"On the DCS console, you can restore backup data to a chosen DCS instance.At least one master/standby or cluster DCS instance is in the Running state.A backup task has bee",
"product_code":"dcs",
"title":"Restoring a DCS Instance",
"uri":"dcs-ug-0312033.html",
"doc_type":"usermanual",
"p_code":"80",
"code":"84"
},
{
"desc":"Automatically backed up data can be retained for a maximum of 7 days. Manually backed up data is not free of charge and takes space in OBS. Due to these limitations, you ",
"product_code":"dcs",
"title":"Downloading a Backup File",
"uri":"dcs-ug-0312034.html",
"doc_type":"usermanual",
"p_code":"80",
"code":"85"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Migrating Data with DCS",
"uri":"dcs-ug-0312035.html",
"doc_type":"usermanual",
"p_code":"",
"code":"86"
},
{
"desc":"DCS for Redis supports online migration (in full or incrementally) and backup migration (by importing backup files).Backup migration is suitable when the source and targe",
"product_code":"dcs",
"title":"Introduction to Migration with DCS",
"uri":"dcs-ug-0312036.html",
"doc_type":"usermanual",
"p_code":"86",
"code":"87"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Importing Backup Files",
"uri":"dcs-ug-210922001.html",
"doc_type":"usermanual",
"p_code":"86",
"code":"88"
},
{
"desc":"Use the DCS console to migrate backup data to DCS for Redis.Simply download the source Redis backup data and then upload the data to an OBS bucket in the same region as t",
"product_code":"dcs",
"title":"Importing Backup Files from an OBS Bucket",
"uri":"dcs-ug-0312037.html",
"doc_type":"usermanual",
"p_code":"88",
"code":"89"
},
{
"desc":"Use the DCS console to migrate Redis data from self-hosted Redis to DCS for Redis.Simply back up your Redis data, create a migration task on the DCS console, and then imp",
"product_code":"dcs",
"title":"Importing Backup Files from Redis",
"uri":"dcs-ug-210226001.html",
"doc_type":"usermanual",
"p_code":"88",
"code":"90"
},
{
"desc":"If the source and target instances are interconnected and the SYNC and PSYNC commands are supported in the source instance, data can be migrated online in full or increme",
"product_code":"dcs",
"title":"Migrating Data Online",
"uri":"dcs-ug-0312038.html",
"doc_type":"usermanual",
"p_code":"86",
"code":"91"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Managing Passwords",
"uri":"dcs-ug-0312039.html",
"doc_type":"usermanual",
"p_code":"",
"code":"92"
},
{
"desc":"Passwords can be configured to control access to your DCS instances, ensuring the security of your data.After 5 consecutive incorrect password attempts, the account for a",
"product_code":"dcs",
"title":"DCS Instance Passwords",
"uri":"cache-instance-password.html",
"doc_type":"usermanual",
"p_code":"92",
"code":"93"
},
{
"desc":"On the DCS console, you can change the password required for accessing your DCS instance.You cannot change the password of a DCS instance in password-free mode.The DCS in",
"product_code":"dcs",
"title":"Changing Instance Passwords",
"uri":"dcs-ug-0312040.html",
"doc_type":"usermanual",
"p_code":"92",
"code":"94"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Parameter Templates",
"uri":"dcs-ug-210622001.html",
"doc_type":"usermanual",
"p_code":"",
"code":"95"
},
{
"desc":"This section describes how to view parameter templates on the DCS console.Currently, you can enter a keyword in the search box to search for a parameter template by templ",
"product_code":"dcs",
"title":"Viewing Parameter Templates",
"uri":"dcs-ug-210622002.html",
"doc_type":"usermanual",
"p_code":"95",
"code":"96"
},
{
"desc":"You can create custom parameter templates for different cache engine versions and instance types based on service requirements.If you select Default Templates, click Cust",
"product_code":"dcs",
"title":"Creating a Custom Parameter Template",
"uri":"dcs-ug-210622003.html",
"doc_type":"usermanual",
"p_code":"95",
"code":"97"
},
{
"desc":"You can modify the name, description, and parameters of a custom parameter template based on service requirements.Click Edit in the Operation column.Change the name or mo",
"product_code":"dcs",
"title":"Modifying a Custom Parameter Template",
"uri":"dcs-ug-210622004.html",
"doc_type":"usermanual",
"p_code":"95",
"code":"98"
},
{
"desc":"This section describes how to delete a custom parameter template.",
"product_code":"dcs",
"title":"Deleting a Custom Parameter Template",
"uri":"dcs-ug-210622005.html",
"doc_type":"usermanual",
"p_code":"95",
"code":"99"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Monitoring",
"uri":"dcs-ug-0326016.html",
"doc_type":"usermanual",
"p_code":"",
"code":"100"
},
{
"desc":"This section describes DCS metrics reported to Cloud Eye as well as their namespaces and dimensions. You can use the Cloud Eye console or call APIs to query the DCS metri",
"product_code":"dcs",
"title":"DCS Metrics",
"uri":"dcs-ug-0326019.html",
"doc_type":"usermanual",
"p_code":"100",
"code":"101"
},
{
"desc":"You can view DCS instance metrics on the Performance Monitoring page.You can also click View Metric in the Operation column on the Cache Manager page. You will be redirec",
"product_code":"dcs",
"title":"Viewing DCS Monitoring Metrics",
"uri":"dcs-ug-0312045.html",
"doc_type":"usermanual",
"p_code":"100",
"code":"102"
},
{
"desc":"This section describes the alarm rules of some metrics and how to configure the rules. In actual scenarios, configure alarm rules for metrics by referring to the followin",
"product_code":"dcs",
"title":"Configuring Alarm Rules for Critical Metrics",
"uri":"dcs-ug-190905001.html",
"doc_type":"usermanual",
"p_code":"100",
"code":"103"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Auditing",
"uri":"dcs-ug-0326017.html",
"doc_type":"usermanual",
"p_code":"",
"code":"104"
},
{
"desc":"With CTS, you can query, audit, and review operations performed on cloud resources. Traces include the operation requests sent using the management console or open APIs a",
"product_code":"dcs",
"title":"Operations That Can Be Recorded by CTS",
"uri":"dcs-ug-0326018.html",
"doc_type":"usermanual",
"p_code":"104",
"code":"105"
},
{
"desc":"After CTS is enabled, the tracker starts recording operations on cloud resources. Operation records for the last seven days can be viewed on the CTS console. This section",
"product_code":"dcs",
"title":"Viewing Traces on the CTS Console",
"uri":"dcs-ug-0312047.html",
"doc_type":"usermanual",
"p_code":"104",
"code":"106"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Data Migration Guide",
"uri":"dcs-migration-230313.html",
"doc_type":"usermanual",
"p_code":"",
"code":"107"
},
{
"desc":"Due to variations of Redis application environments and scenarios, migration solutions must be detailed to address actual requirements. The time required for data migrati",
"product_code":"dcs",
"title":"Overview",
"uri":"dcs-migration-0713001.html",
"doc_type":"usermanual",
"p_code":"107",
"code":"108"
},
{
"desc":"Collect the following information about the cached data to be migrated (based on Information to be collected for the migration):Number of instancesNumber of databases (DB",
"product_code":"dcs",
"title":"Migration Process",
"uri":"dcs-migration-0312001.html",
"doc_type":"usermanual",
"p_code":"107",
"code":"109"
},
{
"desc":"Self-hosted Redis refers to self-hosted Redis on this service, in another cloud, or in on-premises data centers.",
"product_code":"dcs",
"title":"Migration Tools and Schemes",
"uri":"dcs-migration-090626002.html",
"doc_type":"usermanual",
"p_code":"107",
"code":"110"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Migrating Data from Self-Hosted Redis to DCS",
"uri":"dcs-migration-0312002.html",
"doc_type":"usermanual",
"p_code":"107",
"code":"111"
},
{
"desc":"If the source and target instances are interconnected and the SYNC and PSYNC commands are supported by the source instance, data can be migrated online in full or increme",
"product_code":"dcs",
"title":"Online Migration of Self-Hosted Redis",
"uri":"dcs-migration-190703003.html",
"doc_type":"usermanual",
"p_code":"111",
"code":"112"
},
{
"desc":"Use the DCS console to migrate Redis data from Redis of another cloud or self-hosted Redis to DCS for Redis.Simply download the source Redis data and then upload the data",
"product_code":"dcs",
"title":"Backup Migration of Self-Hosted Redis",
"uri":"dcs-migration-190703002.html",
"doc_type":"usermanual",
"p_code":"111",
"code":"113"
},
{
"desc":"redis-cli is the command line tool of Redis, which can be used after you install the Redis server.Run the following command to download Redis:wget http://download.redis.i",
"product_code":"dcs",
"title":"Self-Hosted Redis Migration with redis-cli (AOF)",
"uri":"dcs-migration-0312010.html",
"doc_type":"usermanual",
"p_code":"111",
"code":"114"
},
{
"desc":"redis-cli is the command line tool of Redis, which can be used after you install the Redis server.redis-cli supports data export as an RDB file. If your Redis service doe",
"product_code":"dcs",
"title":"Self-Hosted Redis Migration with redis-cli (RDB)",
"uri":"dcs-migration-0312011.html",
"doc_type":"usermanual",
"p_code":"111",
"code":"115"
},
{
"desc":"redis-shake is an open-source tool for migrating data online or offline (by importing backup files) between Redis Clusters. Data can be migrated to DCS Redis Cluster inst",
"product_code":"dcs",
"title":"Self-Hosted Redis Cluster Migration with redis-shake",
"uri":"dcs-migrate-demo02.html",
"doc_type":"usermanual",
"p_code":"111",
"code":"116"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Migrating Data Between DCS Instances",
"uri":"dcs-migration-0312008.html",
"doc_type":"usermanual",
"p_code":"107",
"code":"117"
},
{
"desc":"If the source and target instances are interconnected and the SYNC and PSYNC commands are supported by the source instance, data can be migrated online in full or increme",
"product_code":"dcs",
"title":"Online Migration Between DCS Redis Instances",
"uri":"dcs-migration-0312003.html",
"doc_type":"usermanual",
"p_code":"117",
"code":"118"
},
{
"desc":"Use the DCS console to migrate Redis data from Redis of another cloud or self-hosted Redis to DCS for Redis.Simply download the source Redis data and then upload the data",
"product_code":"dcs",
"title":"Backup Migration Between Regions or Redis Versions",
"uri":"dcs-migration-0312004.html",
"doc_type":"usermanual",
"p_code":"117",
"code":"119"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Migrating Redis Data from Another Cloud to DCS",
"uri":"dcs-migration-0312005.html",
"doc_type":"usermanual",
"p_code":"107",
"code":"120"
},
{
"desc":"If the source and target instances are interconnected and the SYNC and PSYNC commands are supported by the source instance, data can be migrated online in full or increme",
"product_code":"dcs",
"title":"Online Migration from Another Cloud",
"uri":"dcs-migration-0312006.html",
"doc_type":"usermanual",
"p_code":"120",
"code":"121"
},
{
"desc":"Use the DCS console to migrate Redis data from Redis of another cloud or self-hosted Redis to DCS for Redis.Simply download the source Redis data and then upload the data",
"product_code":"dcs",
"title":"Backup Migration from Another Cloud",
"uri":"dcs-migration-1117001.html",
"doc_type":"usermanual",
"p_code":"120",
"code":"122"
},
{
"desc":"Redis instances provided by some cloud service vendors do not allow SLAVEOF, BGSAVE, and PSYNC commands to be issued from Redis clients. As a result, redis-cli, redis-sha",
"product_code":"dcs",
"title":"Online Migration with Rump",
"uri":"dcs-migration-090626001_0.html",
"doc_type":"usermanual",
"p_code":"120",
"code":"123"
},
{
"desc":"redis-shake is an open-source tool for migrating data online or offline (by importing backup files) between Redis Clusters. If the source Redis Cluster is deployed in ano",
"product_code":"dcs",
"title":"Offline Migration of Redis Cluster from Another Cloud with redis-shake",
"uri":"dcs-migrate-1117003.html",
"doc_type":"usermanual",
"p_code":"120",
"code":"124"
},
{
"desc":"redis-shake is an open-source Redis migration tool. Its rump mode allows you to obtain the full data of a source Redis using the SCAN command and write the data to a targ",
"product_code":"dcs",
"title":"Online Full Migration of Redis from Another Cloud with redis-shake",
"uri":"dcs-migrate-0220411.html",
"doc_type":"usermanual",
"p_code":"120",
"code":"125"
},
{
"desc":"You can use the online migration function of the DCS console to migrate DCS Redis instances to your self-hosted Redis. You can also export the DCS instance data to an RDB",
"product_code":"dcs",
"title":"Migrating Data from DCS to Self-Hosted Redis",
"uri":"dcs-migration-0312007.html",
"doc_type":"usermanual",
"p_code":"107",
"code":"126"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"FAQs",
"uri":"dcs-faq-0326019.html",
"doc_type":"usermanual",
"p_code":"",
"code":"127"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Client and Network Connection",
"uri":"dcs-faq-0326020.html",
"doc_type":"usermanual",
"p_code":"127",
"code":"128"
},
{
"desc":"DCS helps you control access to your DCS instances in the following ways, depending on the deployment mode:To control access to DCS Redis 3.0 instances, you can use secur",
"product_code":"dcs",
"title":"Security Group Configurations",
"uri":"en-us_topic_0090662012.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"129"
},
{
"desc":"No. DCS instances cannot be access at their EIPs over public networks. To ensure security, the ECS that serves as a client and the DCS instance that the client will acces",
"product_code":"dcs",
"title":"Does DCS Support Access over Public Networks?",
"uri":"dcs-faq-0730001.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"130"
},
{
"desc":"Cross-VPC means the client and the instance are not in the same VPC.Generally, VPCs are isolated from each other and ECSs cannot access DCS instances that belong to a dif",
"product_code":"dcs",
"title":"Does DCS Support Cross-VPC Access?",
"uri":"en-us_topic_0100698850.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"131"
},
{
"desc":"This is because you have enabled password-free access for the instance. To prevent the error message from appearing, do not enter any password.",
"product_code":"dcs",
"title":"Why Is \"(error) NOAUTH Authentication required\" Displayed When I Access a DCS Redis Instance?",
"uri":"dcs-faq-0427005.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"132"
},
{
"desc":"Analysis: If persistent connections (\"pconnect\" in Redis terminology) or connection pooling is used and connections are closed after being used for connecting to DCS inst",
"product_code":"dcs",
"title":"What Should I Do If Access to DCS Fails After Server Disconnects?",
"uri":"dcs-faq-0730004.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"133"
},
{
"desc":"Occasional timeout errors are normal because of network connectivity and client timeout configurations.You are advised to include reconnection operations into your servic",
"product_code":"dcs",
"title":"Why Do Requests Sometimes Time Out in Clients?",
"uri":"dcs-faq-0730005.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"134"
},
{
"desc":"The error message that will possibly be displayed when you use the Jedis connection pool is as follows:If this error message is displayed, check whether your instance is ",
"product_code":"dcs",
"title":"What Should I Do If an Error Is Returned When I Use the Jedis Connection Pool?",
"uri":"dcs-faq-0730006.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"135"
},
{
"desc":"The possible causes are as follows:The command is spelled incorrectly.As shown in the following figure, the error message is returned because the correct command for dele",
"product_code":"dcs",
"title":"Why Is \"ERR unknown command\" Displayed When I Access a DCS Redis Instance Through a Redis Client?",
"uri":"dcs-faq-0730007.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"136"
},
{
"desc":"You can access a DCS Redis instance through the Redis Desktop Manager within a VPC.Enter the address, port number (6379), and authentication password of the DCS instance ",
"product_code":"dcs",
"title":"How Do I Access a DCS Redis Instance Through Redis Desktop Manager?",
"uri":"dcs-faq-0730008.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"137"
},
{
"desc":"By using DCS Redis instances, Spring Session can implement session sharing. When interconnecting with Spring Cloud, the following error information is displayed:For secur",
"product_code":"dcs",
"title":"What If \"ERR Unsupported CONFIG subcommand\" is Displayed in SpringCloud?",
"uri":"dcs-faq-0730009.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"138"
},
{
"desc":"A DCS Redis instance can be access with or without a password. You can directly access a DCS Redis instance through a Redis client without setting a password. However, fo",
"product_code":"dcs",
"title":"Is a Password Required for Accessing an Instance? How Do I Set a Password?",
"uri":"dcs-faq-0427015.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"139"
},
{
"desc":"Pay attention to the following issues when using Redis for pub/sub:Your client must process messages in a timely manner.Your client subscribes to a channel. If it does no",
"product_code":"dcs",
"title":"What Should Be Noted When Using Redis for Pub/Sub?",
"uri":"dcs-faq-0730011.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"140"
},
{
"desc":"Preliminary checks:Check the connection address.Obtain the connection address from the instance basic information page on the DCS console.Obtain the connection address fr",
"product_code":"dcs",
"title":"How Do I Troubleshoot Redis Connection Failures?",
"uri":"dcs-faq-0730010.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"141"
},
{
"desc":"Error message \"Cannot assign requested address\" is returned when you access Redis using connect.Applications that encounter this error typically use php-fpm and phpredis.",
"product_code":"dcs",
"title":"What Can I Do If Error \"Cannot assign requested address\" Is Returned When I Access Redis Using connect?",
"uri":"dcs-faq-210721003.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"142"
},
{
"desc":"The comparison between Lettuce and Jedis is as follows:LettuceLettuce does not perform connection keepalive detection. If an abnormal connection exists in the connection ",
"product_code":"dcs",
"title":"Connection Pool Selection and Recommended Jedis Parameter Settings",
"uri":"dcs-faq-211230001.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"143"
},
{
"desc":"Single-node, and Proxy Cluster:Each instance has only one IP address and one domain name address. The addresses remain unchanged before and after master/standby switchove",
"product_code":"dcs",
"title":"Should I Use a Domain Name or an IP Address to Connect to a DCS Redis Instance?",
"uri":"dcs-faq-022025.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"144"
},
{
"desc":"A master/standby DCS Redis 4.0/5.0/6.0 instance has a Connection Address and a Read-only Address. The connection address is used to connect to the master node of the inst",
"product_code":"dcs",
"title":"Is the Read-only Address of a Master/Standby Instance Connected to the Master or Standby Node?",
"uri":"dcs-faq-221222.html",
"doc_type":"usermanual",
"p_code":"128",
"code":"145"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Redis Usage",
"uri":"dcs-faq-0326021.html",
"doc_type":"usermanual",
"p_code":"127",
"code":"146"
},
{
"desc":"Possible cause 1:The service QPS is so high that the CPU usage spikes to 100%.The service QPS is so high that the CPU usage spikes to 100%.Possible cause 2:You have run c",
"product_code":"dcs",
"title":"Why Is CPU Usage of a DCS Redis Instance 100%?",
"uri":"dcs-faq-0730012.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"147"
},
{
"desc":"No. Once an instance is created, its VPC and subnet cannot be changed. If you want to use a different set of VPC and subnet, create a same instance and specify a desired ",
"product_code":"dcs",
"title":"Can I Change the VPC and Subnet for a DCS Redis Instance?",
"uri":"dcs-faq-0730013.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"148"
},
{
"desc":"Currently, DCS Redis 4.0/5.0/6.0 instances use VPC endpoints and do not support security groups. You can configure whitelists instead. For details, see Managing IP Addres",
"product_code":"dcs",
"title":"Why Aren't Security Groups Configured for DCS Redis 4.0/5.0/6.0 Instances?",
"uri":"dcs-faq-0730014.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"149"
},
{
"desc":"The maximum allowed size of a key is 512 MB.To reduce memory usage and facilitate key query, ensure that each key does not exceed 1 KB.To reduce memory usage and facilita",
"product_code":"dcs",
"title":"Do DCS Redis Instances Limit the Size of a Key or Value?",
"uri":"dcs-faq-0730015.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"150"
},
{
"desc":"Cluster DCS Redis 3.0 instances (Proxy Cluster type) are used in the same way that you use single-node or master/standby instances. You do not need to know the backend no",
"product_code":"dcs",
"title":"Can I Obtain the Addresses of the Nodes in a Cluster DCS Redis Instance?",
"uri":"dcs-faq-0730017.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"151"
},
{
"desc":"DCS Redis 3.0 instances are deployed on VMs and some memory is reserved for system overheads. This problem will not occur on other instance versions.",
"product_code":"dcs",
"title":"Why Is Available Memory Smaller Than Instance Cache Size?",
"uri":"dcs-faq-0730018.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"152"
},
{
"desc":"Both single-node and master/standby DCS Redis instances support multiple databases. By default, single-node and master/standby DCS instances can read and write data in 25",
"product_code":"dcs",
"title":"Does DCS for Redis Support Multiple Databases?",
"uri":"dcs-faq-0730019.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"153"
},
{
"desc":"Yes. DCS for Redis 4.0 and later support Redis Clusters. DCS for Redis 3.0 supports Proxy Clusters.",
"product_code":"dcs",
"title":"Does DCS for Redis Support Redis Clusters?",
"uri":"dcs-faq-0730020.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"154"
},
{
"desc":"Cluster instances and master/standby DCS Redis 4.0 and later instances support Sentinels. Sentinels monitor the running status of both the master and standby nodes of a m",
"product_code":"dcs",
"title":"Does DCS for Redis Support Sentinel?",
"uri":"dcs-faq-0730021.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"155"
},
{
"desc":"Data is evicted from cache based on a user-defined space limit in order to make space for new data. For details, see the Redis official website. You can view or change th",
"product_code":"dcs",
"title":"What Is the Default Data Eviction Policy?",
"uri":"dcs-faq-0730022.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"156"
},
{
"desc":"Start the Redis exporter using the CLI. Based on the output, check for errors and troubleshoot accordingly.",
"product_code":"dcs",
"title":"What Should I Do If an Error Occurs in Redis Exporter?",
"uri":"dcs-faq-0730023.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"157"
},
{
"desc":"Redisson implements lock acquisition and unlocking in the following process:Redisson lock acquisition and unlocking are implemented by running Lua scripts.During lock acq",
"product_code":"dcs",
"title":"Why Is Redisson Distributed Lock Not Supported by DCS Proxy Cluster Redis 3.0 Instances?",
"uri":"dcs-faq-0730025.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"158"
},
{
"desc":"You cannot customize or change the port for accessing a DCS Redis 3.0 instance. You can customize (during instance creation) and change the port (on the instance details ",
"product_code":"dcs",
"title":"Can I Customize or Change the Port for Accessing a DCS Instance?",
"uri":"dcs-faq-0730026.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"159"
},
{
"desc":"After a DCS instance is created, its intra-VPC connection addresses cannot be modified.To use a different IP address, you must create a new instance and manually specify ",
"product_code":"dcs",
"title":"Can I Modify the Connection Addresses for Accessing a DCS Instance?",
"uri":"dcs-faq-0730027.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"160"
},
{
"desc":"Master/Standby and cluster DCS Redis instances can be deployed across availability zones (AZs).If instance nodes in an AZ are faulty, nodes in other AZs will not be affec",
"product_code":"dcs",
"title":"Does DCS Support Cross-AZ Deployment?",
"uri":"dcs-faq-0730029.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"161"
},
{
"desc":"Possible cause: When a cluster instance is started, status and data are synchronized between the nodes of the instance. If a large amount of data is continuously written ",
"product_code":"dcs",
"title":"Why Does It Take a Long Time to Start a Cluster DCS Instance?",
"uri":"dcs-faq-0730030.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"162"
},
{
"desc":"No. If you wish to query Redis configurations and usage information, use redis-cli. If you wish to monitor DCS Redis instance metrics, go to the Cloud Eye console. For de",
"product_code":"dcs",
"title":"Does DCS for Redis Provide Backend Management Software?",
"uri":"dcs-faq-0730032.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"163"
},
{
"desc":"If a DCS instance is automatically deleted or manually deleted through the Redis client, its data cannot be retrieved. If you have backed up the instance, you can restore",
"product_code":"dcs",
"title":"Can I Recover Data from Deleted DCS Instances?",
"uri":"dcs-faq-0730034.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"164"
},
{
"desc":"Symptom: \"Error in execution; nested exception is io.lettuce.core.RedisCommandExecutionException: OOM command not allowed when used memory > 'maxmemory'\" is returned duri",
"product_code":"dcs",
"title":"Why Is \"Error in execution\" Returned When I Access Redis?",
"uri":"dcs-faq-210223001.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"165"
},
{
"desc":"Normally, Redis keys do not disappear. If a key is missing, it may have expired, been evicted, or been deleted.Perform the following checks one by one:Check whether the k",
"product_code":"dcs",
"title":"Why Does a Key Disappear in Redis?",
"uri":"dcs-faq-210409001.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"166"
},
{
"desc":"Multi-key operations, such as those using the MSET command or Lua scripts, are atomic. All specified keys are executed at the same time. However, in a cluster, each key i",
"product_code":"dcs",
"title":"Explaining and Using Hash Tags",
"uri":"dcs-faq-211228001.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"167"
},
{
"desc":"After a single-node DCS instance is restarted, data in the instance is deleted.Master/Standby and cluster instances (except single-replica clusters) support AOF persisten",
"product_code":"dcs",
"title":"Will Cached Data Be Retained After an Instance Is Restarted?",
"uri":"dcs-faq-0220330.html",
"doc_type":"usermanual",
"p_code":"146",
"code":"168"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Redis Commands",
"uri":"dcs-faq-190921003.html",
"doc_type":"usermanual",
"p_code":"127",
"code":"169"
},
{
"desc":"Exercise caution when clearing data.Redis 3.0Data of a DCS Redis 3.0 instance cannot be cleared on the console, and can only be cleared by the FLUSHDB or FLUSHALL command",
"product_code":"dcs",
"title":"How Do I Clear Redis Data?",
"uri":"dcs-faq-0730036.html",
"doc_type":"usermanual",
"p_code":"169",
"code":"170"
},
{
"desc":"Yes. For more information about Redis command compatibility, see Command Compatibility.",
"product_code":"dcs",
"title":"Does DCS for Redis Support the INCR and EXPIRE Commands?",
"uri":"dcs-faq-0730039.html",
"doc_type":"usermanual",
"p_code":"169",
"code":"171"
},
{
"desc":"Possible causes include the following:The command is incorrect.As shown in the following figure, the error message is returned because the correct command for deleting a ",
"product_code":"dcs",
"title":"Why Do I Fail to Execute Some Redis Commands?",
"uri":"dcs-faq-0730040.html",
"doc_type":"usermanual",
"p_code":"169",
"code":"172"
},
{
"desc":"Run the command in redis-cli to check whether the command takes effect.The following describes two scenarios:Scenario 1: Set and query the value of a key to check whether",
"product_code":"dcs",
"title":"Why Does a Redis Command Fail to Take Effect?",
"uri":"dcs-faq-0730041.html",
"doc_type":"usermanual",
"p_code":"169",
"code":"173"
},
{
"desc":"Redis command timeouts can be controlled on the client end or server end.Timeouts on the client end are controlled in the client code. You can determine the timeouts that",
"product_code":"dcs",
"title":"Is There a Time Limit on Executing Redis Commands? What Will Happen If a Command Times Out?",
"uri":"dcs-faq-0427057.html",
"doc_type":"usermanual",
"p_code":"169",
"code":"174"
},
{
"desc":"No. Like in open-source Redis, keys in DCS for Redis are case-sensitive and cannot be configured to be case-insensitive.",
"product_code":"dcs",
"title":"Can I Configure Redis Keys to Be Case-Insensitive?",
"uri":"dcs-faq-0427058.html",
"doc_type":"usermanual",
"p_code":"169",
"code":"175"
},
{
"desc":"No. Redis does not record commands and does not support viewing the most frequently used commands.",
"product_code":"dcs",
"title":"Can I View the Most Frequently Used Redis Commands?",
"uri":"dcs-faq-0624001.html",
"doc_type":"usermanual",
"p_code":"169",
"code":"176"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Instance Scaling and Upgrade",
"uri":"dcs-faq-0326022.html",
"doc_type":"usermanual",
"p_code":"127",
"code":"177"
},
{
"desc":"No. Different Redis versions use different underlying architectures. The Redis version used by a DCS instance cannot be changed once the instance is created. For example,",
"product_code":"dcs",
"title":"Can DCS Redis Instances Be Upgraded, for Example, from Redis 4.0 to 5.0?",
"uri":"dcs-faq-0730043.html",
"doc_type":"usermanual",
"p_code":"177",
"code":"178"
},
{
"desc":"O&M personnel will contact you before performing maintenance during the maintenance time window, informing you of the operations and their impacts. You do not need to wor",
"product_code":"dcs",
"title":"Are Services Interrupted If Maintenance is Performed During the Maintenance Time Window?",
"uri":"dcs-faq-0730044.html",
"doc_type":"usermanual",
"p_code":"177",
"code":"179"
},
{
"desc":"No. Specification modifications can take place while the instance is running and do not affect any other resources.",
"product_code":"dcs",
"title":"Are Instances Stopped or Restarted During Specification Modification?",
"uri":"dcs-faq-0730045.html",
"doc_type":"usermanual",
"p_code":"177",
"code":"180"
},
{
"desc":"You are advised to change the instance specifications during off-peak hours because specification modification has the following impacts:Supported instance type changes:F",
"product_code":"dcs",
"title":"Are Services Interrupted During Specification Modification?",
"uri":"dcs-faq-0730047.html",
"doc_type":"usermanual",
"p_code":"177",
"code":"181"
},
{
"desc":"Check whether other tasks are running.Specifications of a DCS instance cannot be modified if another task of the instance is still running. For example, you cannot delete",
"product_code":"dcs",
"title":"Why Can't I Modify Specifications for a DCS Redis Instance?",
"uri":"dcs-faq-0730048.html",
"doc_type":"usermanual",
"p_code":"177",
"code":"182"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Monitoring and Alarm",
"uri":"dcs-faq-0326023.html",
"doc_type":"usermanual",
"p_code":"127",
"code":"183"
},
{
"desc":"The number of connections received by a DCS instance is a metric that is monitored by Cloud Eye. For details on how to view metrics, see Viewing DCS Monitoring Metrics.On",
"product_code":"dcs",
"title":"How Do I View Current Concurrent Connections and Maximum Connections of a DCS Redis Instance?",
"uri":"dcs-faq-0427070.html",
"doc_type":"usermanual",
"p_code":"183",
"code":"184"
},
{
"desc":"No. To ensure high-performance reads and writes, Redis does not audit commands. Commands are not printed.",
"product_code":"dcs",
"title":"Does Redis Support Command Audits?",
"uri":"dcs-faq-0730049.html",
"doc_type":"usermanual",
"p_code":"183",
"code":"185"
},
{
"desc":"If you have any doubt on the monitoring data of a DCS Redis instance, you can access the instance through redis-cli and run the INFO ALL command to view the metrics. For ",
"product_code":"dcs",
"title":"What Should I Do If the Monitoring Data of a DCS Redis Instance Is Abnormal?",
"uri":"dcs-faq-0730050.html",
"doc_type":"usermanual",
"p_code":"183",
"code":"186"
},
{
"desc":"For single-node and master/standby DCS instances, the used instance memory is measured by the Redis-server process. For cluster DCS instances, the used cluster memory is ",
"product_code":"dcs",
"title":"Why Is Used Memory Greater Than Available Memory?",
"uri":"dcs-faq-0730052.html",
"doc_type":"usermanual",
"p_code":"183",
"code":"187"
},
{
"desc":"The basic information about the bandwidth usage metric is as follows.Bandwidth usage = (Input flow + Output flow)/(2 x Maximum bandwidth) x 100%According to the formula, ",
"product_code":"dcs",
"title":"Why Does Bandwidth Usage Exceed 100%?",
"uri":"dcs-faq-0513001.html",
"doc_type":"usermanual",
"p_code":"183",
"code":"188"
},
{
"desc":"If the Rejected Connections metric is displayed, check if the number of connected clients exceeds the maximum allowed number of connections of the instances.To check the ",
"product_code":"dcs",
"title":"Why Is the Rejected Connections Metric Displayed?",
"uri":"dcs-faq-0603001.html",
"doc_type":"usermanual",
"p_code":"183",
"code":"189"
},
{
"desc":"Flow control is triggered when the traffic used by a Redis instance in a period exceeds the maximum bandwidth.For details about the maximum bandwidth of an instance flavo",
"product_code":"dcs",
"title":"Why Is Flow Control Triggered? How Do I Handle It?",
"uri":"dcs-faq-0220721.html",
"doc_type":"usermanual",
"p_code":"183",
"code":"190"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Data Backup, Export, and Migration",
"uri":"dcs-faq-0326024.html",
"doc_type":"usermanual",
"p_code":"127",
"code":"191"
},
{
"desc":"For master/standby or cluster instances:Perform the following operations to export the data:On the Backups & Restorations page, view the backup records.If there are no ba",
"product_code":"dcs",
"title":"How Do I Export DCS Redis Instance Data?",
"uri":"dcs-faq-0730053.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"192"
},
{
"desc":"Redis 3.0No. On the console, backup data of a DCS Redis 3.0 instance can be exported only to AOF files. To export data to RDB files, run the following command in redis-cl",
"product_code":"dcs",
"title":"Can I Export Backup Data of DCS Redis Instances to RDB Files Using the Console?",
"uri":"dcs-faq-0730054.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"193"
},
{
"desc":"DCS Redis instances:Single-node: Data persistence is not supported.Master/standby and cluster (except single-replica clusters): Data persistence is supported.Single-node:",
"product_code":"dcs",
"title":"Does DCS Support Data Persistence? What Is the Impact of Persistence?",
"uri":"dcs-faq-0427081.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"194"
},
{
"desc":"AOF rewrites involve the following concepts:Rewrite window, which is currently 01:00 to 04:59Disk usage threshold, which is 50%Dataset memory, which is the percentage of ",
"product_code":"dcs",
"title":"When Will AOF Rewrites Be Triggered?",
"uri":"dcs-faq-210706001.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"195"
},
{
"desc":"No. A migration task allows data to be migrated to only one target instance. To migrate data to multiple target instances, create multiple migration tasks.",
"product_code":"dcs",
"title":"Can I Migrate Data to Multiple Target Instances in One Migration Task?",
"uri":"dcs-faq-220317.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"196"
},
{
"desc":"Migration within DCS:By default, the SYNC and PSYNC commands can be used when self-hosted Redis is migrated to DCS.During online migration between DCS Redis instances in ",
"product_code":"dcs",
"title":"How Do I Enable the SYNC and PSYNC Commands?",
"uri":"dcs-faq-210721001.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"197"
},
{
"desc":"Possible causes:The underlying resources are insufficient.The specifications of the ECS used for the migration are insufficient.The memory of the target Redis created bef",
"product_code":"dcs",
"title":"Why Does Migration Task Creation Fail?",
"uri":"dcs-faq-210721002.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"198"
},
{
"desc":"If the data exists on both the source and target instances, the target data is overwritten by the source data. If the data exists only on the target instance, the data wi",
"product_code":"dcs",
"title":"Will the Same Keys Be Overwritten During Data Migration or Backup Import?",
"uri":"dcs-faq-11185.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"199"
},
{
"desc":"Rump is an open-source tool designed for migrating Redis data online. It supports migration between DBs of the same instance and between DBs of different instances.Rump u",
"product_code":"dcs",
"title":"Online Migration with Rump",
"uri":"dcs-migration-090626001.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"200"
},
{
"desc":"Convert the format of a data file before importing the file.Run the following command to convert the format of a file in the Windows OS to that in the Unix-like OS:dos2un",
"product_code":"dcs",
"title":"What Should I Consider When Transferring or Operating Data Between Different OSs?",
"uri":"dcs-migration-0312016.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"201"
},
{
"desc":"A total of 256 DBs (DB 0 to DB 255) can be configured for a single-node or master/standby DCS instance.If the target is a cluster instance (a cluster instance has only on",
"product_code":"dcs",
"title":"Can I Migrate Data from a Multi-DB Source Redis Instance to a Cluster DCS Redis Instance?",
"uri":"dcs-migration-0312017.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"202"
},
{
"desc":"The online migration function provided on the console does not support migration of specified DBs. If you want to migrate specified Redis DBs, use redis-shake to export o",
"product_code":"dcs",
"title":"How Can I Migrate Partial Data?",
"uri":"dcs-migration-0312018.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"203"
},
{
"desc":"Proxy Cluster instancesProxy Cluster instances are used in the same way that you use single-node or master/standby instances. However, only one DB is configured for a Pro",
"product_code":"dcs",
"title":"What Are the Constraints and Precautions for Migrating Redis Data to a Cluster Instance?",
"uri":"dcs-migration-0312019.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"204"
},
{
"desc":"NetworkBefore online migration, ensure that the network configured for the migration task is connected to source and target Redis instances.Before online migration, ensur",
"product_code":"dcs",
"title":"What Should I Consider for Online Migration?",
"uri":"dcs-migration-0312020.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"205"
},
{
"desc":"Yes. You can use the application dual-write mode. In this mode, during data migration, data is still read from the source Redis instance, and operations such as adding, d",
"product_code":"dcs",
"title":"Can I Perform Online Migration Without Any Service Interruption?",
"uri":"dcs-migration-0312021.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"206"
},
{
"desc":"The following error messages may be displayed during online migration:\"Disconnecting timedout slave\" is reported on the source instance, as shown in the following figure:",
"product_code":"dcs",
"title":"What If \"Disconnecting timedout slave\" and \"overcoming of output buffer limits\" Are Reported on the Source Instance During Online Migration?",
"uri":"dcs-migration-211125001.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"207"
},
{
"desc":"For details on how to use Rump, see the Data Migration Guide.Possible causes:Rump does not support migration to cluster DCS instances.Commands are incorrectly run in Rump",
"product_code":"dcs",
"title":"Why Is Memory of a DCS Redis Instance Unchanged After Data Migration Using Rump, Even If No Error Message Is Returned?",
"uri":"dcs-faq-0427076.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"208"
},
{
"desc":"Yes. Redis is backward compatible.The version of the source Redis (DCS, self-built, or another cloud) can be earlier than or the same as the target DCS instance.",
"product_code":"dcs",
"title":"Can I Migrate Data from a Lower Redis Version to a Higher One?",
"uri":"dcs-migration-0715005.html",
"doc_type":"usermanual",
"p_code":"191",
"code":"209"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Big/Hot Key Analysis and Expired Key Scan",
"uri":"dcs-faq-0805001.html",
"doc_type":"usermanual",
"p_code":"127",
"code":"210"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"What Are Big Keys and Hot Keys?",
"uri":"dcs-faq-0521003.html",
"doc_type":"usermanual",
"p_code":"210",
"code":"211"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"What Is the Impact of Big Keys or Hot Keys?",
"uri":"dcs-faq-0521004.html",
"doc_type":"usermanual",
"p_code":"210",
"code":"212"
},
{
"desc":"Keep the size of Strings within 10 KB and the quantity of Hashes, Lists, Sets, or Zsets within 5000.When naming keys, use the service name abbreviation as the prefix and ",
"product_code":"dcs",
"title":"How Do I Avoid Big Keys and Hot Keys?",
"uri":"dcs-faq-0521005.html",
"doc_type":"usermanual",
"p_code":"210",
"code":"213"
},
{
"desc":"DCS for Redis 3.0 does not support hot key analysis on the console. Alternatively, you can use the following methods to analyze hot keys:Method 1: Analyze the service str",
"product_code":"dcs",
"title":"How Do I Analyze the Hot Keys of a DCS Redis 3.0 Instance?",
"uri":"dcs-faq-0521006.html",
"doc_type":"usermanual",
"p_code":"210",
"code":"214"
},
{
"desc":"Hot key analysis is not supported by DCS Redis 3.0 instances. You can configure alarms to detect hot keys.Configure alarm rules for the Memory Usage metric of the instanc",
"product_code":"dcs",
"title":"How Do I Detect Big Keys and Hot Keys in Advance?",
"uri":"dcs-faq-0606002.html",
"doc_type":"usermanual",
"p_code":"210",
"code":"215"
},
{
"desc":"What are the rules for scheduled deletion of expired keys on a daily basis? Can I customize the rules?Lazy free deletion: The deletion strategy is controlled in the main ",
"product_code":"dcs",
"title":"How Does DCS Delete Expired Keys?",
"uri":"dcs-faq-210531002.html",
"doc_type":"usermanual",
"p_code":"210",
"code":"216"
},
{
"desc":"Key storage durationKeys that do not have an expiration are stored permanently.Keys that have an expiration are deleted after they expire. For details, see Scanning Expir",
"product_code":"dcs",
"title":"How Long Are Keys Stored? How Do I Set Key Expiration?",
"uri":"dcs-faq-210812001.html",
"doc_type":"usermanual",
"p_code":"210",
"code":"217"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Master/Standby Switchover",
"uri":"dcs-faq-191204001.html",
"doc_type":"usermanual",
"p_code":"127",
"code":"218"
},
{
"desc":"A master/standby switchover may occur in the following scenarios:A master/standby switchover operation is initiated on the DCS Console.If the master node of a master/stan",
"product_code":"dcs",
"title":"When Does a Master/Standby Switchover Occur?",
"uri":"dcs-faq-0730058.html",
"doc_type":"usermanual",
"p_code":"218",
"code":"219"
},
{
"desc":"If a fault occurs in a master/standby or cluster DCS instance, a failover is triggered automatically. Services may be interrupted for less than half a minute during excep",
"product_code":"dcs",
"title":"How Does Master/Standby Switchover Affect Services?",
"uri":"dcs-faq-0730059.html",
"doc_type":"usermanual",
"p_code":"218",
"code":"220"
},
{
"desc":"No. If the master fails, the standby node will be promoted to master and takes the original IP address.",
"product_code":"dcs",
"title":"Does the Client Need to Switch the Connection Address After a Master/Standby Switchover?",
"uri":"dcs-faq-0730060.html",
"doc_type":"usermanual",
"p_code":"218",
"code":"221"
},
{
"desc":"Redis master/standby instances are also called master/slave instances. Generally, updates to the master cache node are automatically and asynchronously replicated to the ",
"product_code":"dcs",
"title":"How Does Redis Master/Standby Replication Work?",
"uri":"dcs-faq-0730061.html",
"doc_type":"usermanual",
"p_code":"218",
"code":"222"
},
{
"desc":"For details about the terms involved in this document, see Glossary.",
"product_code":"dcs",
"title":"Glossary",
"uri":"en-us_topic_0072429345.html",
"doc_type":"usermanual",
"p_code":"",
"code":"223"
},
{
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
"product_code":"dcs",
"title":"Change History",
"uri":"dcs-ug-0326026.html",
"doc_type":"usermanual",
"p_code":"",
"code":"224"
}
]
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