FAQ

Which Redis versions are compatible with Tair?

How many databases does a single Tair instance have?

Do all Tair instances have primary and secondary nodes?

Can I configure multiple secondary nodes for a Tair instance?

Are secondary nodes accessible in Tair instances?

Does Tair support failover between primary and secondary nodes?

Does Tair support Global Distributed Cache?

Redis CSRF vulnerabilities and Tair security measures

How do I obtain the endpoint and ID of a Tair instance?

How do I connect to an instance by using redis-cli?

Does Tair (Redis OSS-compatible) support common Redis clients such as Jedis?

Do I need to install Redis on an ECS instance to connect to a Tair instance?

Is a password required to connect to a Tair (Redis OSS-compatible) instance?

How do I troubleshoot Tair connection issues?

Cross-account connection between a Tair instance and an ECS instance

How do I use telnet to test port connectivity for a Tair instance?

Use the PING command to test the network connectivity between an ECS instance and a Tair instance

How do I check whether an ECS instance and a Tair instance are in the same network environment?

Why can't I find an existing vSwitch when creating a Tair instance?

Connection error: "WRONGPASS invalid username-password pair"

"Cannot assign requested address" error

Why can a client that is not in the IP whitelist access an instance?

Using the database

• How much memory can each database use and how do I switch between databases?

• Why is the memory usage of a new Tair instance not zero?

• Does the instance support bloom filters?

• What triggers a primary/secondary failover?

• How do I obtain a request ID?

• How do I import Redis data?

• Why is data not strongly consistent between primary and secondary nodes?

• How does a data shard failure affect the request success rate?

• How do I query the data node and slot to which a key belongs?

• Why can't I switch between proxy mode and direct connection mode for a cloud-native cluster instance?

• Why does an upgrade or downgrade fail for a classic (local disk) cluster instance?

Performance and monitoring

• How do I monitor a Tair instance? Are alerts automatically sent when the capacity is full?

• Why is the memory usage in alerts inconsistent with the memory usage in monitoring?

• How do I handle data skew in a cluster?

• How do I resolve a sudden increase in instance memory usage?

• How do I query large keys in a Tair instance?

• How do I view shard information for a Tair cluster instance?

• How do I view performance metrics for each node in a Tair cluster instance?

Persistence

• Can data be recovered after it is deleted from Tair (Redis OSS-compatible)?

Parameter settings

• Common parameter tuning examples

Eviction policy

• What is the default data eviction policy?

• How do I purge expired keys?

• How do I delete keys in batches?