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DCS UMN 20240521 version

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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>
This commit is contained in:
Chen, Junjie 2024-07-05 08:59:46 +00:00 committed by zuul
parent 37b97ffc06
commit 3de6842994
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<a name="dcs-faq-022025"></a><a name="dcs-faq-022025"></a> <a name="dcs-faq-022025"></a><a name="dcs-faq-022025"></a>
<h1 class="topictitle1">Should I Use a Domain Name or an IP Address to Connect to a DCS Redis Instance?</h1> <h1 class="topictitle1">Should I Use a Domain Name or an IP Address to Connect to a DCS Redis Instance?</h1>
<div id="body8662426"><ul id="dcs-faq-022025__en-us_topic_0000001384917470_ul89122251302"><li id="dcs-faq-022025__en-us_topic_0000001384917470_li1791232514013">Single-node and Proxy Cluster:<p id="dcs-faq-022025__en-us_topic_0000001384917470_p6197182914019"><a name="dcs-faq-022025__en-us_topic_0000001384917470_li1791232514013"></a><a name="en-us_topic_0000001384917470_li1791232514013"></a>Each instance has only one IP address and one domain name address. The addresses remain unchanged before and after master/standby switchover. You can use either address to connect to the instance.</p> <div id="body8662426"><ul id="dcs-faq-022025__en-us_topic_0000001384917470_ul89122251302"><li id="dcs-faq-022025__en-us_topic_0000001384917470_li1791232514013">Single-node, and Proxy Cluster:<p id="dcs-faq-022025__en-us_topic_0000001384917470_p6197182914019"><a name="dcs-faq-022025__en-us_topic_0000001384917470_li1791232514013"></a><a name="en-us_topic_0000001384917470_li1791232514013"></a>Each instance has only one IP address and one domain name address. The addresses remain unchanged before and after master/standby switchover. You can use either address to connect to the instance.</p>
</li><li id="dcs-faq-022025__en-us_topic_0000001384917470_li1591315257017">Master/standby:<p id="dcs-faq-022025__en-us_topic_0000001384917470_p146226296134"><a name="dcs-faq-022025__en-us_topic_0000001384917470_li1591315257017"></a><a name="en-us_topic_0000001384917470_li1591315257017"></a>Each instance has one IP address and two domain name addresses. One of the domain name addresses is used only for processing read requests. The addresses remain unchanged after master/standby switchover. You can use any address to connect to the instance.</p> </li><li id="dcs-faq-022025__en-us_topic_0000001384917470_li1591315257017">Master/Standby:<p id="dcs-faq-022025__en-us_topic_0000001384917470_p146226296134"><a name="dcs-faq-022025__en-us_topic_0000001384917470_li1591315257017"></a><a name="en-us_topic_0000001384917470_li1591315257017"></a>Each instance has one IP address and two domain name addresses. One of the domain name addresses is used only for processing read requests. The addresses remain unchanged after master/standby switchover. You can use any address to connect to the instance.</p>
<p id="dcs-faq-022025__en-us_topic_0000001384917470_p962218293137">When you use a domain name address, distinguish between read and write requests. If you use <strong id="dcs-faq-022025__en-us_topic_0000001384917470_b10918133171317">Connection Address</strong> or <strong id="dcs-faq-022025__en-us_topic_0000001384917470_b13759750111320">IP Address</strong>, functions are not affected. If you use <strong id="dcs-faq-022025__en-us_topic_0000001384917470_b32901621131411">Read-only Address</strong>, only read requests are processed.</p> <p id="dcs-faq-022025__en-us_topic_0000001384917470_p962218293137">When you use a domain name address, distinguish between read and write requests. If you use <strong id="dcs-faq-022025__en-us_topic_0000001384917470_b10918133171317">Connection Address</strong> or <strong id="dcs-faq-022025__en-us_topic_0000001384917470_b13759750111320">IP Address</strong>, functions are not affected. If you use <strong id="dcs-faq-022025__en-us_topic_0000001384917470_b32901621131411">Read-only Address</strong>, only read requests are processed.</p>
</li><li id="dcs-faq-022025__en-us_topic_0000001384917470_li19131252011">Redis Cluster:<p id="dcs-faq-022025__en-us_topic_0000001384917470_p36421369014"><a name="dcs-faq-022025__en-us_topic_0000001384917470_li19131252011"></a><a name="en-us_topic_0000001384917470_li19131252011"></a>A Redis Cluster instance has multiple pairs of master and replica IP addresses and one domain name address. You can use any address to connect to the instance.</p> </li><li id="dcs-faq-022025__en-us_topic_0000001384917470_li19131252011">Redis Cluster:<p id="dcs-faq-022025__en-us_topic_0000001384917470_p36421369014"><a name="dcs-faq-022025__en-us_topic_0000001384917470_li19131252011"></a><a name="en-us_topic_0000001384917470_li19131252011"></a>A Redis Cluster instance has multiple pairs of master and replica IP addresses and one domain name address. You can use any address to connect to the instance.</p>
<p id="dcs-faq-022025__en-us_topic_0000001384917470_p1351193812014">The connected node sends requests to the correct node. All nodes in the cluster can receive requests. <strong id="dcs-faq-022025__en-us_topic_0000001384917470_b11191691310">Configure multiple or all IP addresses</strong> to prevent single points of failure.</p> <p id="dcs-faq-022025__en-us_topic_0000001384917470_p1351193812014">The connected node sends requests to the correct node. All nodes in the cluster can receive requests. <strong id="dcs-faq-022025__en-us_topic_0000001384917470_b11191691310">Configure multiple or all IP addresses</strong> to prevent single points of failure.</p>

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</td> </td>
<td class="cellrowborder" valign="top" width="77.11%" headers="mcps1.3.2.1.3.1.2 "><p id="dcs-faq-0521005__p834719309371"><strong id="dcs-faq-0521005__b834703033715">Split big keys.</strong></p> <td class="cellrowborder" valign="top" width="77.11%" headers="mcps1.3.2.1.3.1.2 "><p id="dcs-faq-0521005__p834719309371"><strong id="dcs-faq-0521005__b834703033715">Split big keys.</strong></p>
<p id="dcs-faq-0521005__p9347153013373">Scenarios:</p> <p id="dcs-faq-0521005__p9347153013373">Scenarios:</p>
<ul id="dcs-faq-0521005__ul12347130153716"><li id="dcs-faq-0521005__li73471030183712"><strong id="dcs-faq-0521005__b57304051153910">If the big key is a String</strong>, you can split it into several key-value pairs and use <strong id="dcs-faq-0521005__b162589608453910">MGET</strong> or a pipeline consisting of multiple <strong id="dcs-faq-0521005__b164200870853910">GET</strong> operations to obtain the values. In this way, the pressure of a single operation can be split. For a cluster instance, the operation pressure can be evenly distributed to multiple shards, reducing the impact on a single shard.</li><li id="dcs-faq-0521005__li43471330143717"><strong id="dcs-faq-0521005__b7713182391514">If the big key contains multiple elements, and the elements must be operated together</strong>, the big key cannot be split. You can remove the big key from Redis and store it on other storage media instead. This scenario should be avoided by design.</li><li id="dcs-faq-0521005__li234703023715"><strong id="dcs-faq-0521005__b1534743016372">If the big key contains multiple elements, and only some elements need to be operated each time</strong>, separate the elements. Take a Hash key as an example. Each time you run the <strong id="dcs-faq-0521005__b52932189953910">HGET</strong> or <strong id="dcs-faq-0521005__b110362695053910">HSET</strong> command, the result of the hash value modulo <em id="dcs-faq-0521005__i196395322153910">N</em> (customized on the client) determines which key the field falls on. This algorithm is similar to that used for calculating slots in Redis Cluster.</li></ul> <ul id="dcs-faq-0521005__ul12347130153716"><li id="dcs-faq-0521005__li73471030183712"><strong id="dcs-faq-0521005__b1325751825017">If the big key is a String</strong>, you can split it into several key-value pairs and use <strong id="dcs-faq-0521005__b1925771813509">MGET</strong> or a pipeline consisting of multiple <strong id="dcs-faq-0521005__b17257121815015">GET</strong> operations to obtain the values. In this way, the pressure of a single operation can be split. For a cluster instance, key-value pairs can be automatically distributed to multiple shards, reducing the impact on a single shard.</li><li id="dcs-faq-0521005__li43471330143717"><strong id="dcs-faq-0521005__b7713182391514">If the big key contains multiple elements, and the elements must be operated together</strong>, the big key cannot be split. You can remove the big key from Redis and store it on other storage media instead. This scenario should be avoided by design.</li><li id="dcs-faq-0521005__li234703023715"><strong id="dcs-faq-0521005__b1534743016372">If the big key contains multiple elements, and only some elements need to be operated each time</strong>, separate the elements. Take a Hash key as an example. Each time you run the <strong id="dcs-faq-0521005__b52932189953910">HGET</strong> or <strong id="dcs-faq-0521005__b110362695053910">HSET</strong> command, the result of the hash value modulo <em id="dcs-faq-0521005__i196395322153910">N</em> (customized on the client) determines which key the field falls on. This algorithm is similar to that used for calculating slots in Redis Cluster.</li></ul>
</td> </td>
</tr> </tr>
<tr id="dcs-faq-0521005__row1517316326368"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.3.1.1 "><p id="dcs-faq-0521005__p6347163013717"><strong id="dcs-faq-0521005__b5347130123717">Store big keys on other storage media.</strong></p> <tr id="dcs-faq-0521005__row1517316326368"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.3.1.1 "><p id="dcs-faq-0521005__p6347163013717"><strong id="dcs-faq-0521005__b5347130123717">Store big keys on other storage media.</strong></p>

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<h1 class="topictitle1">What Should I Do If the Monitoring Data of a DCS Redis Instance Is Abnormal?</h1> <h1 class="topictitle1">What Should I Do If the Monitoring Data of a DCS Redis Instance Is Abnormal?</h1>
<div id="body1596093777162"><p id="dcs-faq-0730050__en-us_topic_0152099101_p33070983410">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 <strong id="dcs-faq-0730050__b74728337820">INFO ALL</strong> command to view the metrics. For details about the output of the <strong id="dcs-faq-0730050__b19312834689">INFO ALL</strong> command, see <a href="http://www.redis.io/commands/info" target="_blank" rel="noopener noreferrer">http://www.redis.io/commands/info</a>.</p> <div id="body1596093777162"><p id="dcs-faq-0730050__en-us_topic_0152099101_p33070983410">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 <strong id="dcs-faq-0730050__b74728337820">INFO ALL</strong> command to view the metrics. For details about the output of the <strong id="dcs-faq-0730050__b1671151152911">INFO ALL</strong> command, see <a href="https://redis.io/docs/latest/commands/info/" target="_blank" rel="noopener noreferrer">https://redis.io/docs/latest/commands/info/</a>.</p>
</div> </div>
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<a name="dcs-faq-210721002"></a><a name="dcs-faq-210721002"></a> <a name="dcs-faq-210721002"></a><a name="dcs-faq-210721002"></a>
<h1 class="topictitle1">Why Does Migration Task Creation Fail?</h1> <h1 class="topictitle1">Why Does Migration Task Creation Fail?</h1>
<div id="body8662426"><p id="dcs-faq-210721002__en-us_topic_0000001198023687_en-us_topic_0000001133077796_p7789185510414">Possible causes:</p> <div id="body8662426"><p id="dcs-faq-210721002__en-us_topic_0000001198023687_p7789185510414">Possible causes:</p>
<ol id="dcs-faq-210721002__en-us_topic_0000001198023687_en-us_topic_0000001133077796_ol28091255164112"><li id="dcs-faq-210721002__en-us_topic_0000001198023687_en-us_topic_0000001133077796_li780995518416">The underlying resources are insufficient.</li><li id="dcs-faq-210721002__en-us_topic_0000001198023687_en-us_topic_0000001133077796_li980945524114">The specifications of the ECS used for the migration are insufficient.</li><li id="dcs-faq-210721002__en-us_topic_0000001198023687_en-us_topic_0000001133077796_li1580985574119">The memory of the target Redis created before the migration is less than that of the source Redis.</li></ol> <ol id="dcs-faq-210721002__en-us_topic_0000001198023687_ol28091255164112"><li id="dcs-faq-210721002__en-us_topic_0000001198023687_li780995518416">The underlying resources are insufficient.</li><li id="dcs-faq-210721002__en-us_topic_0000001198023687_li980945524114">The specifications of the ECS used for the migration are insufficient.</li><li id="dcs-faq-210721002__en-us_topic_0000001198023687_li1580985574119">The memory of the target Redis created before the migration is less than that of the source Redis.</li></ol>
<p id="dcs-faq-210721002__en-us_topic_0000001198023687_p4794458134810">In such cases, contact technical support.</p>
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<div class="note" id="dcs-ug-0326008__en-us_topic_0148195251_note3899303327"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="dcs-ug-0326008__en-us_topic_0148195251_ul1889230183212"><li id="dcs-ug-0326008__en-us_topic_0148195251_li17323124651811">When creating a Proxy Cluster instance, you can only select version 3.0.</li><li id="dcs-ug-0326008__en-us_topic_0148195251_li11892308323">When creating a Redis Cluster instance, you can select versions 4.0, 5.0, or 6.0.</li><li id="dcs-ug-0326008__li12179105512912">The Redis version cannot be changed once the instance is created. To use a later Redis version, create another DCS Redis instance and then migrate data from the old instance to the new one.</li><li id="dcs-ug-0326008__li19179655112914">The method of connecting a client to a Redis Cluster instance is different from that of connecting a client to other types of instances. For details, see <a href="dcs-ug-0326009.html">Accessing a DCS Redis Instance Through redis-cli</a>.</li></ul> <div class="note" id="dcs-ug-0326008__en-us_topic_0148195251_note3899303327"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="dcs-ug-0326008__en-us_topic_0148195251_ul1889230183212"><li id="dcs-ug-0326008__en-us_topic_0148195251_li17323124651811">When creating a Proxy Cluster instance, you can only select version 3.0.</li><li id="dcs-ug-0326008__en-us_topic_0148195251_li11892308323">When creating a Redis Cluster instance, you can select versions 4.0, 5.0, or 6.0.</li><li id="dcs-ug-0326008__li12179105512912">The Redis version cannot be changed once the instance is created. To use a later Redis version, create another DCS Redis instance and then migrate data from the old instance to the new one.</li><li id="dcs-ug-0326008__li19179655112914">The method of connecting a client to a Redis Cluster instance is different from that of connecting a client to other types of instances. For details, see <a href="dcs-ug-0326009.html">Accessing a DCS Redis Instance Through redis-cli</a>.</li></ul>
</div></div> </div></div>
</li><li id="dcs-ug-0326008__en-us_topic_0148195251_li184161849123219">Set <strong id="dcs-ug-0326008__en-us_topic_0148195251_b12663195163">Instance Type</strong> to <strong id="dcs-ug-0326008__en-us_topic_0148195251_b726710192167">Single-node</strong>, <strong id="dcs-ug-0326008__en-us_topic_0148195251_b20267171914166">Master/Standby</strong>, <strong id="dcs-ug-0326008__en-us_topic_0148195251_b9268141971615">Proxy Cluster</strong> or <strong id="dcs-ug-0326008__en-us_topic_0148195251_b1826851971611">Redis Cluster</strong>.</li><li id="dcs-ug-0326008__li11930167205816">Set <strong id="dcs-ug-0326008__b17516539356">CPU Architecture</strong> to <strong id="dcs-ug-0326008__b97655333517">x86</strong>.</li><li id="dcs-ug-0326008__li6882755152814">Set <strong id="dcs-ug-0326008__b1790052615426">Replicas</strong>. The default value is <strong id="dcs-ug-0326008__b119008269420">2</strong> (including the master).<p id="dcs-ug-0326008__p11193115620292">This parameter is displayed only when you select Redis 4.0/5.0/6.0 and the instance type is master/standby or Redis Cluster.</p> </li><li id="dcs-ug-0326008__en-us_topic_0148195251_li184161849123219">Set <strong id="dcs-ug-0326008__en-us_topic_0148195251_b12663195163">Instance Type</strong> to <strong id="dcs-ug-0326008__en-us_topic_0148195251_b726710192167">Single-node</strong>, <strong id="dcs-ug-0326008__en-us_topic_0148195251_b20267171914166">Master/Standby</strong>, <strong id="dcs-ug-0326008__en-us_topic_0148195251_b9268141971615">Proxy Cluster</strong> or <strong id="dcs-ug-0326008__en-us_topic_0148195251_b1826851971611">Redis Cluster</strong>.</li><li id="dcs-ug-0326008__li11930167205816">Set <strong id="dcs-ug-0326008__b17516539356">CPU Architecture</strong> to <strong id="dcs-ug-0326008__b97655333517">x86</strong>.</li><li id="dcs-ug-0326008__li6882755152814">Set <strong id="dcs-ug-0326008__b1790052615426">Replicas</strong>. The default value is <strong id="dcs-ug-0326008__b119008269420">2</strong> (including the master).<p id="dcs-ug-0326008__p11193115620292">This parameter is displayed only when you select Redis 4.0/5.0/6.0 and the instance type is master/standby or Redis Cluster.</p>
</li><li id="dcs-ug-0326008__li18175856432">If <strong id="dcs-ug-0326008__b103161975399">4.0</strong> or later, and <strong id="dcs-ug-0326008__b20315881389">Proxy Cluster</strong> or <strong id="dcs-ug-0326008__b143152816380">Redis Cluster</strong> are selected, the <strong id="dcs-ug-0326008__b10315983383">Sharding</strong> parameter is displayed. Options:<ul id="dcs-ug-0326008__ul1979052435613"><li id="dcs-ug-0326008__li167901724125620"><strong id="dcs-ug-0326008__b6633161810427">Use default</strong>: Use the default sharding specifications.</li><li id="dcs-ug-0326008__li147903246568"><strong id="dcs-ug-0326008__b184081134519">Customize</strong>: Customize the size of each shard and then select corresponding instance specifications.</li></ul>
</li><li id="dcs-ug-0326008__en-us_topic_0148195251_li1995203017103">Select an AZ.<p id="dcs-ug-0326008__p735942011578"><a name="dcs-ug-0326008__en-us_topic_0148195251_li1995203017103"></a><a name="en-us_topic_0148195251_li1995203017103"></a>If the instance type is master/standby, Proxy Cluster, or Redis Cluster, <strong id="dcs-ug-0326008__b49451049204218">Standby AZ</strong> is displayed. Select a standby AZ for the standby node of the instance.</p> </li><li id="dcs-ug-0326008__en-us_topic_0148195251_li1995203017103">Select an AZ.<p id="dcs-ug-0326008__p735942011578"><a name="dcs-ug-0326008__en-us_topic_0148195251_li1995203017103"></a><a name="en-us_topic_0148195251_li1995203017103"></a>If the instance type is master/standby, Proxy Cluster, or Redis Cluster, <strong id="dcs-ug-0326008__b49451049204218">Standby AZ</strong> is displayed. Select a standby AZ for the standby node of the instance.</p>
<div class="note" id="dcs-ug-0326008__note1886471755713"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="dcs-ug-0326008__ul8996154920570"><li id="dcs-ug-0326008__li69961749115720">To accelerate access, deploy your instance and your application in the same AZ.</li><li id="dcs-ug-0326008__li1926975255713">There are multiple AZs in each region. If resources are insufficient in an AZ, the AZ will be unavailable. In this case, select another AZ.</li></ul> <div class="note" id="dcs-ug-0326008__note1886471755713"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="dcs-ug-0326008__ul8996154920570"><li id="dcs-ug-0326008__li69961749115720">To accelerate access, deploy your instance and your application in the same AZ.</li><li id="dcs-ug-0326008__li1926975255713">There are multiple AZs in each region. If resources are insufficient in an AZ, the AZ will be unavailable. In this case, select another AZ.</li></ul>
</div></div> </div></div>
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<div class="note" id="dcs-ug-0326008__note18162172918129"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="dcs-ug-0326008__ul14162192910120"><li id="dcs-ug-0326008__li11162629121217">On the instance creation page, the default parameter templates are used by default.</li><li id="dcs-ug-0326008__li181621929131217">If you use a custom template, the selected cache engine version and instance type must match those of the template. For details about using custom templates, see <a href="dcs-ug-210622003.html">Creating a Custom Parameter Template</a>.</li></ul> <div class="note" id="dcs-ug-0326008__note18162172918129"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="dcs-ug-0326008__ul14162192910120"><li id="dcs-ug-0326008__li11162629121217">On the instance creation page, the default parameter templates are used by default.</li><li id="dcs-ug-0326008__li181621929131217">If you use a custom template, the selected cache engine version and instance type must match those of the template. For details about using custom templates, see <a href="dcs-ug-210622003.html">Creating a Custom Parameter Template</a>.</li></ul>
</div></div> </div></div>
</p></li><li id="dcs-ug-0326008__li0286162163410"><span>Choose whether to enable <strong id="dcs-ug-0326008__b926321130104046">Auto Backup</strong>.</span><p><p id="dcs-ug-0326008__p155051937173912">This parameter is displayed only when the instance type is master/standby or cluster. For more information on how to configure a backup policy, see <a href="en-us_topic_0079835992.html">Overview</a>.</p> </p></li><li id="dcs-ug-0326008__li0286162163410"><span>Choose whether to enable <strong id="dcs-ug-0326008__b926321130104046">Auto Backup</strong>.</span><p><p id="dcs-ug-0326008__p155051937173912">This parameter is displayed only when the instance type is master/standby or cluster. For more information on how to configure a backup policy, see <a href="en-us_topic_0079835992.html">Overview</a>.</p>
</p></li><li id="dcs-ug-0326008__li129684814373"><span>Specify the number of instances to create.</span></li><li id="dcs-ug-0326008__li1140718109251"><span>Enter an instance name.</span><p><p id="dcs-ug-0326008__p1292391182512">The value of <strong id="dcs-ug-0326008__b468619155415">Name</strong> contains at least 4 characters. When you create multiple instances at a time, the instances are named in the format of <em id="dcs-ug-0326008__i513762292">custom name</em>-<em id="dcs-ug-0326008__i2020788548">n</em>, where <em id="dcs-ug-0326008__i760637260">n</em> starts from 000 and is incremented by 1. For example, if you create two instances and set <strong id="dcs-ug-0326008__b281007785">name</strong> to <strong id="dcs-ug-0326008__b1171302407">dcs_demo</strong>, the two instances are respectively named as <strong id="dcs-ug-0326008__b181063473">dcs_demo-000</strong> and <strong id="dcs-ug-0326008__b547719720">dcs_demo-001</strong>.</p> </p></li><li id="dcs-ug-0326008__li129684814373"><span>Specify the number of instances to create.</span></li><li id="dcs-ug-0326008__li1140718109251"><span>Enter an instance name.</span><p><p id="dcs-ug-0326008__p1292391182512">The value of <strong id="dcs-ug-0326008__b468619155415">Name</strong> contains at least 4 characters. When you create multiple instances at a time, the instances are named in the format of <em id="dcs-ug-0326008__i2105228149">custom name</em>-<em id="dcs-ug-0326008__i2066714919">n</em>, where <em id="dcs-ug-0326008__i1731540019">n</em> starts from 000 and is incremented by 1. For example, if you create two instances and set <strong id="dcs-ug-0326008__b1333541567">name</strong> to <strong id="dcs-ug-0326008__b629141974">dcs_demo</strong>, the two instances are respectively named as <strong id="dcs-ug-0326008__b883211004">dcs_demo-000</strong> and <strong id="dcs-ug-0326008__b392796246">dcs_demo-001</strong>.</p>
</p></li><li id="dcs-ug-0326008__en-us_topic_0148195251_li17647455231"><span>Click <strong id="dcs-ug-0326008__b10377134733720">More Settings</strong> to configure more parameters.</span><p><ol type="a" id="dcs-ug-0326008__en-us_topic_0148195251_ol179711225192412"><li id="dcs-ug-0326008__en-us_topic_0148195251_li62791011023">Enter a description of the instance.</li><li id="dcs-ug-0326008__en-us_topic_0148195251_li818212588436">Rename critical commands.<p id="dcs-ug-0326008__en-us_topic_0148195251_p12671823144417"><a name="dcs-ug-0326008__en-us_topic_0148195251_li818212588436"></a><a name="en-us_topic_0148195251_li818212588436"></a><strong id="dcs-ug-0326008__b186511426557">Command Renaming</strong> is displayed for Redis 4.0 and later. Currently, you can only rename the <strong id="dcs-ug-0326008__b161858514525">COMMAND</strong>, <strong id="dcs-ug-0326008__b61857514526">KEYS</strong>, <strong id="dcs-ug-0326008__b1118517517526">FLUSHDB</strong>, <strong id="dcs-ug-0326008__b1818525145215">FLUSHALL</strong>, <strong id="dcs-ug-0326008__b10185851155219">HGETALL</strong>, <strong id="dcs-ug-0326008__b118525155210">SCAN</strong>, <strong id="dcs-ug-0326008__b1718516515521">HSCAN</strong>, <strong id="dcs-ug-0326008__b1418675112524">SSCAN</strong>, and <strong id="dcs-ug-0326008__b31861351155215">ZSCAN</strong> commands.</p> </p></li><li id="dcs-ug-0326008__en-us_topic_0148195251_li17647455231"><span>Click <strong id="dcs-ug-0326008__b10377134733720">More Settings</strong> to configure more parameters.</span><p><ol type="a" id="dcs-ug-0326008__en-us_topic_0148195251_ol179711225192412"><li id="dcs-ug-0326008__en-us_topic_0148195251_li62791011023">Enter a description of the instance.</li><li id="dcs-ug-0326008__en-us_topic_0148195251_li818212588436">Rename critical commands.<p id="dcs-ug-0326008__en-us_topic_0148195251_p12671823144417"><a name="dcs-ug-0326008__en-us_topic_0148195251_li818212588436"></a><a name="en-us_topic_0148195251_li818212588436"></a><strong id="dcs-ug-0326008__b186511426557">Command Renaming</strong> is displayed for Redis 4.0 and later. Currently, you can only rename the <strong id="dcs-ug-0326008__b161858514525">COMMAND</strong>, <strong id="dcs-ug-0326008__b61857514526">KEYS</strong>, <strong id="dcs-ug-0326008__b1118517517526">FLUSHDB</strong>, <strong id="dcs-ug-0326008__b1818525145215">FLUSHALL</strong>, <strong id="dcs-ug-0326008__b10185851155219">HGETALL</strong>, <strong id="dcs-ug-0326008__b118525155210">SCAN</strong>, <strong id="dcs-ug-0326008__b1718516515521">HSCAN</strong>, <strong id="dcs-ug-0326008__b1418675112524">SSCAN</strong>, and <strong id="dcs-ug-0326008__b31861351155215">ZSCAN</strong> commands.</p>
</li><li id="dcs-ug-0326008__en-us_topic_0148195251_li14520142518376">Specify the maintenance window.<p id="dcs-ug-0326008__en-us_topic_0148195251_p9703134155218"><a name="dcs-ug-0326008__en-us_topic_0148195251_li14520142518376"></a><a name="en-us_topic_0148195251_li14520142518376"></a>Choose a window for DCS O&amp;M personnel to perform maintenance on your instance. You will be contacted before any maintenance activities are performed.</p> </li><li id="dcs-ug-0326008__en-us_topic_0148195251_li14520142518376">Specify the maintenance window.<p id="dcs-ug-0326008__en-us_topic_0148195251_p9703134155218"><a name="dcs-ug-0326008__en-us_topic_0148195251_li14520142518376"></a><a name="en-us_topic_0148195251_li14520142518376"></a>Choose a window for DCS O&amp;M personnel to perform maintenance on your instance. You will be contacted before any maintenance activities are performed.</p>
</li></ol> </li></ol>

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</th> </th>
</tr> </tr>
</thead> </thead>
<tbody><tr id="dcs-ug-0326026__row12711543185917"><td class="cellrowborder" valign="top" width="18.029999999999998%" headers="mcps1.3.1.1.3.1.1 "><p id="dcs-ug-0326026__p1271211435591">2024-02-17</p> <tbody><tr id="dcs-ug-0326026__row1622275718574"><td class="cellrowborder" valign="top" width="18.029999999999998%" headers="mcps1.3.1.1.3.1.1 "><p id="dcs-ug-0326026__p1922211579572">2024-05-10</p>
</td>
<td class="cellrowborder" valign="top" width="81.97%" headers="mcps1.3.1.1.3.1.2 "><p id="dcs-ug-0326026__p9222125710574">Updated <a href="dcs-ug-0326008.html">Creating a DCS Redis Instance</a> and <a href="dcs-ug-0326011.html">Modifying DCS Instance Specifications</a>. Shard size can be customized for Redis Cluster instances.</p>
</td>
</tr>
<tr id="dcs-ug-0326026__row12711543185917"><td class="cellrowborder" valign="top" width="18.029999999999998%" headers="mcps1.3.1.1.3.1.1 "><p id="dcs-ug-0326026__p1271211435591">2024-02-17</p>
</td> </td>
<td class="cellrowborder" valign="top" width="81.97%" headers="mcps1.3.1.1.3.1.2 "><p id="dcs-ug-0326026__p2712743125920">Updated <a href="dcs-ug-0312019.html">Exporting DCS Instance List</a> and <a href="dcs-faq-0730008.html">How Do I Access a DCS Redis Instance Through Redis Desktop Manager?</a>.</p> <td class="cellrowborder" valign="top" width="81.97%" headers="mcps1.3.1.1.3.1.2 "><p id="dcs-ug-0326026__p2712743125920">Updated <a href="dcs-ug-0312019.html">Exporting DCS Instance List</a> and <a href="dcs-faq-0730008.html">How Do I Access a DCS Redis Instance Through Redis Desktop Manager?</a>.</p>
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<tr id="dcs-ug-190812001__en-us_topic_0185207715_row19704162112571"><td class="cellrowborder" valign="top" width="21.04%" headers="mcps1.3.4.2.6.2.1.2.4.1.1 "><p id="dcs-ug-190812001__en-us_topic_0185207715_p67041121155711">IP Address/Range</p> <tr id="dcs-ug-190812001__en-us_topic_0185207715_row19704162112571"><td class="cellrowborder" valign="top" width="21.04%" headers="mcps1.3.4.2.6.2.1.2.4.1.1 "><p id="dcs-ug-190812001__en-us_topic_0185207715_p67041121155711">IP Address/Range</p>
</td> </td>
<td class="cellrowborder" valign="top" width="28.63%" headers="mcps1.3.4.2.6.2.1.2.4.1.2 "><p id="dcs-ug-190812001__en-us_topic_0185207715_p270482117577">A maximum of 20 IP addresses or IP address ranges can be added to an instance. Separate multiple IP addresses or IP address ranges with commas.</p> <td class="cellrowborder" valign="top" width="28.63%" headers="mcps1.3.4.2.6.2.1.2.4.1.2 "><p id="dcs-ug-190812001__en-us_topic_0185207715_p270482117577">A maximum of 20 IP addresses or IP address ranges can be added to an instance. Separate multiple IP addresses or IP address ranges with commas.</p>
<p id="dcs-ug-190812001__en-us_topic_0185207715_p5215551897">Unsupported IP address and IP address range: 0.0.0.0 and 0.0.0/0.</p> <p id="dcs-ug-190812001__en-us_topic_0185207715_p5215551897">Unsupported IP address and IP address range: 0.0.0.0 and 0.0.0.0/0.</p>
</td> </td>
<td class="cellrowborder" valign="top" width="50.33%" headers="mcps1.3.4.2.6.2.1.2.4.1.3 "><p id="dcs-ug-190812001__en-us_topic_0185207715_p142481837165716">10.10.10.1,10.10.10.10</p> <td class="cellrowborder" valign="top" width="50.33%" headers="mcps1.3.4.2.6.2.1.2.4.1.3 "><p id="dcs-ug-190812001__en-us_topic_0185207715_p142481837165716">10.10.10.1,10.10.10.10</p>
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</li></ul> </li></ul>
</li></ul> </li></ul>
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<div class="section" id="dcs-ug-210330002__en-us_topic_0000001094742130_section5933921103310"><h4 class="sectiontitle">Expired Key Scan</h4><p id="dcs-ug-210330002__en-us_topic_0000001094742130_p6465202618465">DCS integrates these strategies and allows you to periodically release the memory used by expired keys. You can configure scheduled scans on the master nodes of your instances. The entire keyspace is traversed during the scans, triggering Redis to check whether the keys have expired and to remove expired keys if any.</p> <div class="section" id="dcs-ug-210330002__en-us_topic_0000001094742130_section5933921103310"><h4 class="sectiontitle">Expired DCS Key Scan</h4><p id="dcs-ug-210330002__en-us_topic_0000001094742130_p6465202618465">DCS integrates these strategies and allows you to periodically release the memory used by expired keys. You can configure scheduled scans on the master nodes of your instances. The entire keyspace is traversed during the scans, triggering Redis to check whether the keys have expired and to remove expired keys if any.</p>
<div class="note" id="dcs-ug-210330002__en-us_topic_0000001094742130_note14451165891015"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="dcs-ug-210330002__en-us_topic_0000001094742130_p1428175741420">This function is supported only by DCS Redis 4.0, 5.0, and 6.0 instances.</p> <div class="note" id="dcs-ug-210330002__en-us_topic_0000001094742130_note14451165891015"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="dcs-ug-210330002__en-us_topic_0000001094742130_ul1953172919505"><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li653118290501">This function is supported only by DCS Redis 4.0, 5.0, and 6.0 instances.</li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li453122916505">Perform expired key scans during off-peak hours to avoid 100% CPU usage.</li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li10531202925019">Released expired keys cannot be queried.</li></ul>
<p id="dcs-ug-210330002__en-us_topic_0000001094742130_p10766122843720">Perform expired key scans during off-peak hours to avoid 100% CPU usage.</p>
</div></div> </div></div>
</div> </div>
<div class="section" id="dcs-ug-210330002__en-us_topic_0000001094742130_section147232531215"><h4 class="sectiontitle">Procedure</h4><ol id="dcs-ug-210330002__en-us_topic_0000001094742130_ol53031521800"><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li5291141116175"><span>Log in to the DCS console.</span></li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li1830432114016"><span>Click <span><img id="dcs-ug-210330002__en-us_topic_0000001094742130_en-us_topic_0148195235_i0d8b8411c49244f694e4f9ebeef4b3c5" src="en-us_image_0000001681179997.png"></span> in the upper left corner of the management console and select the region where your instance is located.</span></li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li930410211201"><span>In the navigation pane, choose <strong id="dcs-ug-210330002__en-us_topic_0000001094742130_b231949231">Cache Manager</strong>.</span></li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li1930413211204"><span>Click the name of a DCS Redis instance.</span></li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li130412211905"><span>Choose <strong id="dcs-ug-210330002__en-us_topic_0000001094742130_b17785216115712">Analysis and Diagnosis</strong> &gt; <strong id="dcs-ug-210330002__en-us_topic_0000001094742130_b928812011571">Cache Analysis</strong>.</span></li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li19938183355514"><span>On the <strong id="dcs-ug-210330002__en-us_topic_0000001094742130_b1762015535322">Expired Key Scan</strong> tab page, scan for expired keys and release them.</span><p><ul id="dcs-ug-210330002__en-us_topic_0000001094742130_ul19534258134713"><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li353412587470">Click <strong id="dcs-ug-210330002__en-us_topic_0000001094742130_b99764542331">Start Scanning</strong> to scan for expired keys immediately.</li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li1953495814719">Enable <strong id="dcs-ug-210330002__en-us_topic_0000001094742130_b2428152317344">Scheduled</strong> to schedule automatic scans at a specified time. For details about how to configure automatic scans, see <a href="#dcs-ug-210330002__en-us_topic_0000001094742130_section169111727182515">Scheduling Automatic Scans</a>.</li></ul> <div class="section" id="dcs-ug-210330002__en-us_topic_0000001094742130_section147232531215"><h4 class="sectiontitle">Procedure</h4><ol id="dcs-ug-210330002__en-us_topic_0000001094742130_ol53031521800"><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li5291141116175"><span>Log in to the DCS console.</span></li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li1830432114016"><span>Click <span><img id="dcs-ug-210330002__en-us_topic_0000001094742130_en-us_topic_0148195235_i0d8b8411c49244f694e4f9ebeef4b3c5" src="en-us_image_0000001681179997.png"></span> in the upper left corner of the management console and select the region where your instance is located.</span></li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li930410211201"><span>In the navigation pane, choose <strong id="dcs-ug-210330002__en-us_topic_0000001094742130_b231949231">Cache Manager</strong>.</span></li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li1930413211204"><span>Click the name of a DCS Redis instance.</span></li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li130412211905"><span>Choose <strong id="dcs-ug-210330002__en-us_topic_0000001094742130_b17785216115712">Analysis and Diagnosis</strong> &gt; <strong id="dcs-ug-210330002__en-us_topic_0000001094742130_b928812011571">Cache Analysis</strong>.</span></li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li19938183355514"><span>On the <strong id="dcs-ug-210330002__en-us_topic_0000001094742130_b1762015535322">Expired Key Scan</strong> tab page, scan for expired keys and release them.</span><p><ul id="dcs-ug-210330002__en-us_topic_0000001094742130_ul19534258134713"><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li353412587470">Click <strong id="dcs-ug-210330002__en-us_topic_0000001094742130_b99764542331">Start Scanning</strong> to scan for expired keys immediately.</li><li id="dcs-ug-210330002__en-us_topic_0000001094742130_li1953495814719">Enable <strong id="dcs-ug-210330002__en-us_topic_0000001094742130_b2428152317344">Scheduled</strong> to schedule automatic scans at a specified time. For details about how to configure automatic scans, see <a href="#dcs-ug-210330002__en-us_topic_0000001094742130_section169111727182515">Scheduling Automatic Scans</a>.</li></ul>