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.
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.
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.
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.
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
.
Dragonfly is fully compatible with the Redis ecosystem and requires no code changes to implement.