In Node.js, using the
Redis package, you may need to interact with multiple databases. A common use case is to list all available databases in your Redis instance, for example, during debugging or while handling multi-tenant applications.
Unfortunately, Redis does not directly support a command to get all databases. The number of databases is configured in the Redis configuration file, and by default, it's set to 16. However, you can check the number of existing databases in the
Alternatively, you could attempt to switch to each database (up to an arbitrary limit like 16) and see if it succeeds. Here's how to do this in Node.js:
This script tries to select each database from 0 to 15 and logs which ones exist. Note that this doesn't necessarily tell you if the database is 'empty' or not.
Q: Can I increase the number of databases in Redis?
A: Yes, you can change this in your
redis.conf file by setting the
databases directive to a higher value. However, be aware that Redis doesn't intend for these to be used as separate 'tables' – it's often better to use a different key prefix or a completely separate Redis instance.