One common use case of getting all keys matching a particular pattern in Redis is when you want to fetch all keys that start, end or contain a certain substring. This can be very useful in scenarios where keys are named following a certain convention and you need to retrieve all keys belonging to a specific group.
KEYS command is one way to get all keys matching a pattern:
In this code snippet, you connect to the Redis server using
redis.createClient(). Then, you use the
keys('*pattern*') function to get all keys that match the specified pattern.
KEYS command can be resource-intensive on large databases. It's recommended to use
SCAN for such cases, which can be done as follows:
Here we're using the
SCAN command with a cursor to iteratively fetch keys matching the pattern.
Avoid using the
KEYS command in a production environment as it can potentially block the server while executing. Instead, prefer the
SCAN command, which provides an iterator that allows you to retrieve keys in a more controlled manner.
One common mistake is not handling the case when the
SCAN commands return an error. Always ensure to handle potential errors in your callbacks.
SCANcommands? A: No, Redis does not support full regex patterns in
SCANcommands. It supports only glob-style patterns like