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Does DCS for Redis Support Multi-DB? DCS's support for multiple databases (multi-DB) is as follows: Single-node, read/write splitting, and master/standby DCS Redis instances: Multi-DB is supported. By default, there are 256 databases, numbering 0–255. The default database is DB0.
Does DCS for Redis Support Pipelining? Yes. For Redis Cluster instances, ensure that all commands in a pipeline are executed on the same shard. Parent topic: Redis Commands
Does DCS Support Public Access? Redis 3.0 Currently, public access is supported only by password-protected DCS Redis 3.0 instances. You can enable or disable SSL for public access. You are advised to download a CA certificate in advance and use it to verify the certificate of a DCS
Commands Supported and Disabled by DCS for Redis 4.0 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 with Redis commands, including supported and disabled commands
Commands Supported and Disabled by DCS for Redis 5.0 DCS for Redis 5.0 is developed based on Redis 5.0.9 and is compatible with open-source protocols and commands. This section describes DCS for Redis 5.0's compatibility with Redis commands, including supported and disabled commands
Commands Supported and Disabled by DCS for Redis 6.0 Huawei Cloud DCS for Redis 6.0 is fully compatible with open-source Redis 6. This section describes DCS for Redis 6.0's compatibility with KeyDB commands, including supported and disabled commands. DCS Redis instances support most
Infographics for Comparing DCS for Redis with Open-Source Redis
Using SSH Tunneling for Public Access to DCS Overview Currently, Huawei Cloud DCS Redis 4.0 and later cannot be bound with elastic IP addresses (EIPs) and cannot be accessed over public networks directly. This section describes how to create an SSH tunnel as a proxy to connect your
Transmitting DCS Redis Data with Encryption Using SSL Single-node, master/standby, and Redis Cluster basic edition DCS Redis 6.0/7.0 instances support SSL encryption to ensure data transmission security. This function is not available for other instance versions. RESP (Redis Serialization
Performing a Master/Standby Switchover for a DCS Instance On the DCS console, you can manually switch the master and standby nodes of a master/standby or read/write splitting DCS instance. This operation is used for special purposes, for example, releasing all service connections
Enabling Public Access of a DCS Redis 3.0 Instance If public access has been enabled for the instance, skip this section. If public access is not enabled, follow the instructions in this section. You can enable or disable SSL encryption when enabling public access. Before accessing
Accessing a DCS Memcached Instance (Discontinued) Configuring a Memcached Password Connecting to Memcached on a Client
Scanning and Deleting Expired Keys in a DCS Redis Instance 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, the key becomes inaccessible but is not deleted immediately
Troubleshooting High CPU Usage of a DCS Redis Instance 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
Troubleshooting High Memory Usage of a DCS Redis Instance Symptom Redis provides fast database services. If the memory is insufficient, keys may be frequently evicted, the response time may increase, and the QPS may be unstable, affecting service running. This is normal due to Redis
Troubleshooting High Bandwidth Usage of a DCS Redis Instance Overview Redis instances are close to application services, and therefore they process a large amount of data access requests and use network bandwidth. The maximum bandwidth varies depending on the instance specifications
What DCS Instance Type Changes Are Supported? Table 1 Instance type change options supported by different DCS instances Version Supported Type Change Precautions Redis 3.0 From single-node to master/standby The instance cannot be connected for several seconds and remains read-only
Does DCS for Redis Support Command Audits? Auditing commands affects read and write performance. Currently, only Proxy Cluster DCS Redis 4.0 and later instances support command audit logs in certain regions. For details, see Viewing Audit Logs of a DCS Redis Instance. Parent topic
What Memcached Version Is Compatible with DCS for Memcached? DCS for Memcached is based on Redis 3.0 and is compatible with Memcached 1.5.1. Parent topic: Memcached Usage
Does DCS for Memcached Support Public Access? No. If public access is disabled for a DCS instance, you cannot access it in local environments and can only access it through an ECS that is in the same VPC as the instance. VPCs are used to ensure network security of public cloud services
