Redis Get All Keys in Python (Detailed Guide w/ Code Examples)
Use Case(s)
-
Enumerating all keys in a Redis database in Python is useful for debugging, administration, and maintenance tasks.
-
It's also used when you want to perform operations on all keys or a subset of keys in the datastore.
Code Examples
Here's how to get all keys from a Redis database using python's redis
package:
import redis r = redis.Redis(host='localhost', port=6379, db=0) for key in r.scan_iter(): print(key)
In this code snippet, we're connecting to the Redis server, then using the scan_iter()
function to iteratively access each key in the database. Each key is printed to the console.
Best Practices
- The command 'KEYS *' can also retrieve all keys, but it may lead to performance issues in a production environment due to its blocking nature. It's recommended to use the
scan_iter()
method for such cases as it doesn't block the server.
Common Mistakes
- Using 'KEYS *' in a production environment - This command blocks the server while it executes, which can have serious performance implications if your dataset is large.
FAQs
-
*Why should I avoid 'KEYS '? 'KEYS *' is a blocking operation that can cause performance issues especially with larger datasets. Use
scan_iter()
instead which is non-blocking. -
Can I filter keys when retrieving them? Yes, you can use pattern matching inside
scan_iter()
. For example,scan_iter('user:*')
will return all keys that start with 'user:'.
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