ApsaraDB for Redis functions like open source Redis. When you create an ApsaraDB for Redis instance, the system generates database metadata that occupies a fraction of storage space on the instance. You can view the occupied space in the ApsaraDB for Redis console.

Memory occupied by metadata information:

  • The metadata size of a standard instance is 30 MB to 50 MB.

    Specific Enhanced Edition (Tair) instances may contain more metadata than Community Edition instances. The additional metadata that is around dozens of MB in size is used to accelerate queries.

  • The metadata size on each shard of a cluster instance is 30 MB to 50 MB. The total size of metadata in a cluster instance equals the sum of metadata on each shard of the cluster instance.