keys method is commonly used to retrieve all keys matching a certain pattern in a Redis database. This can be useful in several scenarios such as debugging, maintenance tasks, or when you need to manipulate set of data identified by similar key patterns.
Example 1: Get all keys
In this example, we will get all the keys in our Redis instance. The asterisk (*) is a wildcard that matches all keys.
Example 2: Get keys with a specific pattern
In this case, we're looking for keys that start with 'user':
The 'user*' pattern will match any keys that start with 'user'.
Be careful when using the
keys command in a production environment, especially with large databases and broad patterns, as it may degrade performance.
If possible, use the
SCAN command instead of
KEYS. SCAN provides a cursor-based iterator which is more efficient and doesn't block the server.
Using KEYS in production environments: The
KEYS command can negatively impact performance on large databases, so it's not recommended for production environments. Instead, consider using
SCAN or maintain an index of your keys in a separate data structure.
Ignoring return types: The
KEYS command returns an array of strings representing the matching keys or
FALSE if there are no keys. Always ensure to handle these return types correctly in your application.
Q: Can I use patterns with the Redis
A: Yes, you can use patterns when retrieving keys. For example, 'user*' will match any keys that start with 'user'.