If you receive an error message when you use the ApsaraDB for Redis service, you can refer to the list of ApsaraDB for Redis error codes to view the detailed information about the message. For other issues, you can refer to the following topics for troubleshooting.
Features
- Which version of Redis is ApsaraDB for Redis compatible with?
- What commands and operations of ApsaraDB for Redis are compatible with Redis?
- What is the relationship between ApsaraDB for Redis and open source Redis?
- Does an ApsaraDB for Redis instance have limits on CPU processing capability, data transmission bandwidth, and the number of connections?
- How many databases does a single ApsaraDB for Redis instance support?
- Do all ApsaraDB for Redis instances have master and replica nodes?
- Can multiple replica nodes be configured for an ApsaraDB for Redis instance?
- Does ApsaraDB for Redis support read-only replica nodes?
- Does ApsaraDB for Redis support failovers between master and replica nodes?
- Does ApsaraDB for Redis support distributed cluster instances?
- Redis CSRF vulnerability analysis and security measures available for ApsaraDB for Redis
- What is the difference between ApsaraDB for Redis and open source Redis?
Networks and connections
- How do I obtain the endpoint and instance ID of an ApsaraDB for Redis instance?
- How can I connect to an ApsaraDB for Redis instance by using redis-cli?
- Does ApsaraDB for Redis support Redis clients such as Jedis?
- Do I need to install Redis on an ECS instance to use ApsaraDB for Redis?
- Do I need a password to connect to an ApsaraDB for Redis instance?
- How do I troubleshoot connection issues in ApsaraDB for Redis?
- How do I troubleshoot connection issues in ApsaraDB for Redis?
- How do I connect an ECS instance and an ApsaraDB for Redis instance in different networks?
- Why is an ECS instance unable to connect to an ApsaraDB for Redis instance?
- Can an ECS instance in a VPC connect to an ApsaraDB for Redis instance in the classic network?
- How do I troubleshoot connection issues caused by failed DNS resolutions?
- Common Jedis exceptions in ApsaraDB for Redis
- How do I use the telnet command to check the connection to the service port of ApsaraDB for Redis?
- How do I run the PING command to check the connection between an ECS instance and an ApsaraDB for Redis instance?
- How can an application reconnect to ApsaraDB for Redis when a connection to the service timed out?
- How do I check whether an ECS instance and an ApsaraDB for Redis instance are of the same network type?
- Why am I unable to select an existing vSwitch when I create an ApsaraDB for Redis instance?
- What do I do if the "WRONGPASS invalid username-password pair" error message is returned when I attempt to connect to an ApsaraDB for Redis instance?
- Why is the "Cannot assign requested address" error returned when applications use short-lived connections to connect to ApsaraDB for Redis?
- Why are clients still able to access an instance even when an instance whitelist does not include the client IP addresses?
Databases
Database usage
- What is the size of each database on an ApsaraDB for Redis instance, and how can I choose databases?
- Why is the memory usage of a new ApsaraDB for Redis instance not equal to 0?
- Does ApsaraDB for Redis support Bloom filters?
- Why do I receive an SMS message or email indicating that a failover is triggered?
- How do I obtain the value for the requestId parameter?
- How do I use redis-cli to run multiple commands?
- How do I run the same command continuously at a specified frequency?
- How do I use ApsaraDB for Redis to cache PHP session variables?
- Where can I download ApsaraDB for Redis clients?
- How can I import sample data to ApsaraDB for Redis?
- Why does a replica node not synchronize data from the master node?
- Can data be automatically and evenly distributed to data shards after I upgrade an ApsaraDB for Redis standard instance to an ApsaraDB for Redis cluster instance or change the number of data shards of an ApsaraDB for Redis cluster instance?
- Do I need to modify the code after I upgrade an ApsaraDB for Redis standard instance to an ApsaraDB for Redis cluster instance?
- Why am I unable to switch between the proxy mode and the direct connection mode when I use cloud disk-based cluster instances?
- Why do I fail to change the configurations of a cluster instance that use local disks?
Performance monitoring
- How do I monitor an ApsaraDB for Redis instance? Does the system automatically generate alerts when the maximum capacity is reached?
- How do I search for large keys?
- Parameters of slow logs
- How do I monitor instance status in real time by using redis-cli?
- How do I view the architecture and monitoring data of an ApsaraDB for Redis cluster instance?
- How do I view the performance metrics, such as the memory size, of each node in an ApsaraDB for Redis cluster instance?
- How do I view memory usage of all instances in the current Alibaba Cloud account?
- Description of redis-benchmark
- How to use memtier_benchmark to test the performance of an ApsaraDB for Redis cluster instance?
Data persistence
Parameter settings
- Does ApsaraDB for Redis support changing configuration parameters?
- Can I modify the REDIS_SHARED_INTEGERS parameter in ApsaraDB for Redis?
- Common parameter adjustment cases
- How do I handle the invalid timeout parameter when I use redis-cli?
- Modify the synchronization mode of a persistent memory-optimized instance
Expiration policies