How many Redis databases can I create and manage?

The number of databases is unlimited. The limiting factor is the available memory in the cluster, and the number of shards in the subscription. A shard is any provisioned database instance (master copy, slave copy or a database instance that is part of a clustered database).

Note the impact of the specific database configuration on the number of shards it consumes. For example:

• Enabling database replication, without enabling database clustering, creates two shards: a master shard and a slave shard.
• Enabling database clustering creates as many database shards as you configure.
• Enabling both database replication and database clustering creates double the number of database shards you configure.