Redis Get All Databases in Python (Detailed Guide w/ Code Examples)

Use Case(s)

You might need to retrieve information about all databases in your Redis instance when performing diagnostics, monitoring usage, or managing resources. This can be helpful to understand the data distribution across different databases.

Code Examples

Example 1: Fetching the total number of databases configured in Redis using the CONFIG GET command in redis-py.

```
import redis
r = redis.Redis(host='localhost', port=6379, db=0)
dbnum = r.config_get()['databases']
print(f'Total databases: {dbnum}')
```
In this example, we're connecting to the local Redis instance and then using the config_get method to retrieve the configuration. The number of databases is stored under the 'databases' key in the returned dictionary.

Please note that Redis does not provide a direct way to list all database names because databases in Redis are identified by an integer index and not by names.

Best Practices

While interacting with Redis from Python, ensure to handle exceptions appropriately for robust error handling. It's also recommended to close the connection once you're done with the operations.

Common Mistakes

One common mistake is assuming that Redis databases have names. In Redis, databases are not like traditional relational databases—they don't have specific names, they are merely represented by numeric indices.

FAQs

Q: How to check the selected database in Redis?

A: Redis doesn't have a built-in command to check the currently selected database. However, in the redis-py client, the selected database can be found using r.db.