:original_name: en-us_topic_0054617978.html

.. _en-us_topic_0054617978:

Change History
==============

.. table:: **Table 1** Change History

   +-----------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | Released On                       | What's New                                                                                                                                                                                                                                                                                             |
   +===================================+========================================================================================================================================================================================================================================================================================================+
   | 2020-07-17                        | Modified the following content:                                                                                                                                                                                                                                                                        |
   |                                   |                                                                                                                                                                                                                                                                                                        |
   |                                   | -  Added a note in section :ref:`Accessing a DCS Redis Instance <en-us_topic_0054235811>` to advise against hard-coding plaintext passwords in the code.                                                                                                                                               |
   |                                   | -  Added an explanation of the **SYS.DCS** namespace and optimized the table layout in section :ref:`DCS Metrics <dcs-ug-0326019>`.                                                                                                                                                                    |
   |                                   | -  Updated the picture that demonstrates viewing instance metrics in section :ref:`Setting Alarm Rules for Critical Metrics <dcs-ug-190905001>`.                                                                                                                                                       |
   |                                   | -  Optimized the description about CIDR blocks for cross-VPC access and added the table caption in FAQ :ref:`Do DCS Instances Support Cross-VPC Access? <en-us_topic_0103202022>`                                                                                                                      |
   +-----------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | 2020-05-30                        | Modified the following content:                                                                                                                                                                                                                                                                        |
   |                                   |                                                                                                                                                                                                                                                                                                        |
   |                                   | -  Changed the cluster instance type to Proxy Cluster in section :ref:`DCS <en-us_topic_0054235826>`.                                                                                                                                                                                                  |
   |                                   | -  Removed description about creating multiple instances in batches and modified password complexity requirements in section :ref:`Creating a DCS Instance <en-us_topic_0054235810>`.                                                                                                                  |
   |                                   | -  Removed the instance topology parameter in section :ref:`Viewing Details of a DCS Instance <en-us_topic_0054235812>`.                                                                                                                                                                               |
   |                                   | -  Changed the default value of the **reserved-memory-percent** parameter to **0** and added a note clarifying that the configuration parameters supported by single-node and master/standby instances are different in section :ref:`Configuring Redis-Specific Parameters <en-us_topic_0054235814>`. |
   |                                   | -  Modified the special characters that the passwords cannot contain in section :ref:`Changing Instance Passwords <en-us_topic_0054235820>`.                                                                                                                                                           |
   |                                   | -  Removed the section which describes the function of viewing data storage statics of a Proxy Cluster instance.                                                                                                                                                                                       |
   |                                   | -  Added a note clarifying that the backup policy function is not supported by single-node instances in section :ref:`Configuring a Backup Policy <en-us_topic_0062866097>`.                                                                                                                           |
   |                                   | -  Removed Redis Server and Proxy metrics from section :ref:`DCS Metrics <dcs-ug-0326019>`.                                                                                                                                                                                                            |
   +-----------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | 2020-03-25                        | Modified the following content:                                                                                                                                                                                                                                                                        |
   |                                   |                                                                                                                                                                                                                                                                                                        |
   |                                   | -  Changed the cluster instance type to Proxy Cluster in section :ref:`DCS <en-us_topic_0054235826>`.                                                                                                                                                                                                  |
   |                                   | -  Modified the lists of supported and disabled Redis commands in section :ref:`Redis Command Compatibility <dcs-ug-180522002>`.                                                                                                                                                                       |
   |                                   | -  Added the assured/maximum bandwidth parameter in section :ref:`DCS Instance Specifications <en-us_topic_0054235835>`.                                                                                                                                                                               |
   |                                   | -  Moved the metrics originally described in section :ref:`Related Services <en-us_topic_0054235808>` to section :ref:`DCS Metrics <dcs-ug-0326019>` and updated the metrics supported by Cloud Eye.                                                                                                   |
   |                                   | -  Modified instance creation parameters in :ref:`Creating a DCS Instance <en-us_topic_0054235810>` according to DCS console upgrade and parameter modifications.                                                                                                                                      |
   |                                   | -  Modified instance details parameters in section :ref:`Viewing Details of a DCS Instance <en-us_topic_0054235812>` according to DCS console upgrade and parameter modifications.                                                                                                                     |
   |                                   | -  Modified instance configuration parameters in section :ref:`Configuring Redis-Specific Parameters <en-us_topic_0054235814>`.                                                                                                                                                                        |
   |                                   | -  Removed the function of stopping instances.                                                                                                                                                                                                                                                         |
   |                                   | -  Added description about restrictions of starting instances in section :ref:`Starting DCS Instances <en-us_topic_0054235817>`.                                                                                                                                                                       |
   |                                   | -  Changed parameter **Time Window** to **Maintenance** in section :ref:`Modifying an Instance's Maintenance Time Window <en-us_topic_0090713825>`.                                                                                                                                                    |
   |                                   | -  Modified description about configuring instance backup policies in section :ref:`Configuring a Backup Policy <en-us_topic_0062866097>`.                                                                                                                                                             |
   |                                   | -  Added chapter :ref:`Monitoring <dcs-en-ug-180424001>`, updated metrics supported by Cloud Eye, and added description about operations of viewing monitoring data and setting alarm rules.                                                                                                           |
   |                                   | -  Changed the supported number of DBs for single-node and master/standby instances in section :ref:`Does DCS Support Data Read/Write in Multiple Databases? <en-us_topic_0071964265>`                                                                                                                 |
   +-----------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | 2019-04-12                        | Accepted in OTC-4.0/Agile-04.2019.                                                                                                                                                                                                                                                                     |
   +-----------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | 2019-03-30                        | Modified the following content:                                                                                                                                                                                                                                                                        |
   |                                   |                                                                                                                                                                                                                                                                                                        |
   |                                   | -  Removed support for creating DCS instances with the specification of 1 GB in sections :ref:`Advantages <en-us_topic_0054235833>`, :ref:`DCS Instance Specifications <en-us_topic_0054235835>`, and :ref:`Creating a DCS Instance <en-us_topic_0054235810>`.                                         |
   +-----------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | 2018-09-05                        | Modified the following content:                                                                                                                                                                                                                                                                        |
   |                                   |                                                                                                                                                                                                                                                                                                        |
   |                                   | -  Opened certain Redis cluster commands. For details about compatibility with DCS commands, see :ref:`Redis Command Compatibility <dcs-ug-180522002>`.                                                                                                                                                |
   +-----------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | 2018-03-16                        | Added the following content:                                                                                                                                                                                                                                                                           |
   |                                   |                                                                                                                                                                                                                                                                                                        |
   |                                   | -  Added the procedure for using a Redis Java (Jedis) client to access a DCS instance. For details, see :ref:`Accessing a DCS Redis Instance <en-us_topic_0054235811>`.                                                                                                                                |
   |                                   | -  Added descriptions about the Redis-specific parameter **notify-keyspace-events**, anddeleted descriptions about the Redis-specific parameter **maxclients**. For details, see :ref:`Configuring Redis-Specific Parameters <en-us_topic_0054235814>`.                                                |
   |                                   | -  Added the procedures for modifying the time window and security group of a DCS instance. For details, see :ref:`Modifying an Instance's Maintenance Time Window <en-us_topic_0090713825>` and :ref:`Modifying an Instance's Security Group <en-us_topic_0090713826>`.                               |
   |                                   | -  Added :ref:`Do DCS Instances Support Cross-VPC Access? <en-us_topic_0103202022>` in chapter :ref:`FAQs <en-us_topic_0054235821>`.                                                                                                                                                                   |
   |                                   |                                                                                                                                                                                                                                                                                                        |
   |                                   | Modified the following content:                                                                                                                                                                                                                                                                        |
   |                                   |                                                                                                                                                                                                                                                                                                        |
   |                                   | -  Changed instance password complexity rules.                                                                                                                                                                                                                                                         |
   +-----------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | 2017-11-08                        | Added the following content:                                                                                                                                                                                                                                                                           |
   |                                   |                                                                                                                                                                                                                                                                                                        |
   |                                   | -  Provided support for DCS instances in cluster mode.                                                                                                                                                                                                                                                 |
   |                                   | -  Added sections :ref:`Modifying DCS Instance Specifications <en-us_topic_0063519673>` and :ref:`Backing Up and Restoring DCS Instances <en-us_topic_0062866096>`.                                                                                                                                    |
   |                                   | -  Added the **Time Window** parameter.                                                                                                                                                                                                                                                                |
   |                                   | -  Added section :ref:`Setting Up Environments <en-us_topic_0077665192>`.                                                                                                                                                                                                                              |
   |                                   |                                                                                                                                                                                                                                                                                                        |
   |                                   | -  Added some FAQs in chapter :ref:`FAQs <en-us_topic_0054235821>`.                                                                                                                                                                                                                                    |
   +-----------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | 2017-05-30                        | This issue is the third official release, which incorporates the following changes:                                                                                                                                                                                                                    |
   |                                   |                                                                                                                                                                                                                                                                                                        |
   |                                   | -  Added descriptions about batch deletion of DCS instances.                                                                                                                                                                                                                                           |
   |                                   | -  Added descriptions about the Redis-specific parameter **latency-monitor-threshold**.                                                                                                                                                                                                                |
   +-----------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | 2017-04-28                        | Added the following content:                                                                                                                                                                                                                                                                           |
   |                                   |                                                                                                                                                                                                                                                                                                        |
   |                                   | -  Added descriptions of DCS metrics monitored by Cloud Eye.                                                                                                                                                                                                                                           |
   +-----------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | 2017-04-05                        | This issue is the first official release.                                                                                                                                                                                                                                                              |
   +-----------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+