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Commands Supported and Disabled by DCS for Memcached (Discontinued) DCS for Memcached is no longer provided. You can use DCS Redis instances instead. Memcached supports the TCP-based text protocol and binary protocol. Any clients compatible with a Memcached protocol can access DCS
Querying Big Keys and Hot Keys in a DCS Redis Instance Big keys and hot keys are common issues. This section describes the big key and hot key analysis function on the DCS console. This function monitors the key that occupies most space of a Redis instance, or that is most frequently
Test Data of Redis Cluster DCS Redis 6.0 Instances DCS Redis 6.0 basic edition instances support SSL. This section covers the performance tested with and without SSL enabled. Test Environment Redis instance specifications Redis 6.0 | Basic edition | 32 GB | Redis Cluster ECS flavors
Test Data of Proxy Cluster DCS Redis 3.0 Instances Test Environment Redis instance specifications Redis 3.0 | 64 GB | Proxy Cluster ECS flavors General computing-plus | c6.xlarge.2 | 4 vCPUs | 8 GB Test Command redis-benchmark -h {IP} -p {Port} -a {password} -n {nreqs} -r {randomkeys
Can I Change the VPC and Subnet for a DCS Redis Instance? No. Once an instance is created, its VPC and subnet cannot be changed. To use a different set of VPC and subnet, create another instance with a desired set of VPC and subnet and then migrate data as required. For details about
Do DCS Redis Instances Limit the Size of a Key or Value? 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. The maximum allowed size of a string is 512 MB. The maximum allowed size of a Set, List
Does DCS for Redis Support Read/Write Splitting? The following table describes DCS's support for read/write splitting. Instance Type Read/Write Splitting Read/write splitting Supported. NOTE: To implement read/write splitting without client configurations, use read/write splitting
How Can I Secure My DCS Redis Instances? Redis is one of the most powerful and widely used open-source cache technologies. However, the open-source Redis does not have robust security features of its own. It is vulnerable to malicious Internet attacks, possibly causing data breaches
Can I Customize or Change the Port for Accessing a DCS Instance? You cannot customize or change the port for accessing a DCS Redis 3.0, 6.0 enterprise, or Memcached instance. You can customize and change the port for accessing a DCS Redis 4.0, 5.0, 6.0, or 7.0 basic instance. Redis
Can I Modify the Connection Addresses for Accessing a DCS Instance? After a DCS instance is created, its IP address and domain name for intra-VPC access cannot be modified. If public access has been enabled for the instance, the elastic IP address (EIP) bound to the instance can be
Why Do I Fail to Modify the Specifications for a DCS Instance? 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 or scale up an instance while it is being restarted
Why Do I Fail to Create a DCS Redis Instance? The subnet does not have sufficient IP addresses. Analysis: Each node in a DCS instance must be assigned an IP address. Therefore, a single-node instance requires one IP address, a master/standby instance requires two IP addresses, and
How Do I Export DCS Redis Instance Data? Instance data of DCS instances other than single-node ones can be exported on the console: Go to the Cache Manager page on the DCS console. Click the name of the desired instance. The instance details page is displayed. Choose Backups & Restorations
Can I Dump DCS Memcached Instance Data for Analysis? No. Parent topic: Memcached Usage
Can I Modify Configuration Parameters of DCS Memcached Instances? Parameter configuration is allowed only when DCS instances are in the Running state. For details, see Modifying Configuration Parameters. Parent topic: Memcached Usage
Why Is CPU Usage of a DCS Redis Instance 100%? Symptom The CPU usage of a Redis instance increases dramatically within a short period of time. If the CPU usage is too high, connections may time out, and master/standby switchover may be triggered. Possible Causes The service QPS is
How Do I View the Version of a DCS Redis Instance? Connect to the instance and run the INFO command. Figure 1 Querying instance information Parent topic: Instance Types/Versions
Commands Supported and Disabled by DCS for Redis 3.0 (Discontinued) 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 with Redis commands, including supported commands
Test Data of Redis Cluster DCS Redis 4.0 or 5.0 Instances Test Environment Redis instance specifications Redis 4.0 or 5.0 | 32 GB | Redis Cluster ECS flavors General computing-enhanced | c6.xlarge.2 | 4 vCPUs | 8 GB Test tool Three ECSs are used for concurrent tests. The test tool
Test Data of Master/Standby DCS Redis 6.0 Instances DCS Redis 6.0 basic edition instances support SSL. This section covers the performance tested with and without SSL enabled. Test Environment Redis instance specifications Redis 6.0 | Basic edition | 8 GB | Master/Standby Redis 6.0
