The primary use case for this query is to identify which Redis database a client is currently connected to. This is useful when working with multiple databases and wanting to ensure that the right operations are performed on the correct database.
While there isn't a direct command to get the current database, one way to ascertain which database you're interacting with is by knowing that upon establishing a connection, you're always connected to database 0 unless specified otherwise. Here's how you'd specify a database while setting up a connection:
```python import redis
r = redis.Redis(host='localhost', port=6379, db=1) # Connecting to database 1 ```
In the above example, you're connecting to database 1. If not specified, your active database will be the default Redis database 0.
When using Redis with Python, it's good practice to:
A common mistake is assuming that the
db parameter in the
redis.Redis() function is zero-indexed the same way as Python lists. Remember that in Redis, the
db parameter starts from 0, not 1.
Q: How many databases can I have in Redis?
A: By default, Redis configures 16 databases. You can change this by modifying the
databases directive in your Redis configuration file.
Q: How do I switch between databases in Redis?
A: You can switch databases during a session using the
SELECT command, or specify the database during connection setup in Python.