In a web application, caching is used to speed up repeated queries and reduce database load. However, there might be scenarios where you need to delete the cache. For instance:
The following examples use the
redis gem for Ruby.
This will remove the key 'key' from the Redis store.
This will remove both 'key1' and 'key2' from the Redis store.
This command will empty the entire Redis store.
Instead of deleting the entire cache, selectively delete keys as this can help avoid unnecessary database load.
Avoid using flushdb or flushall in production as they will lock your Redis instance while it clears the database.
Not handling exceptions when deleting keys. Ensure you are using proper error handling to avoid breaking the application in case a key isn't found or the Redis server is down.
flushall instead of
flushall command not only deletes data from the current database but also from all other databases on the same Redis instance.
keysmethod and then delete them. For example:
However, be aware that using
keys can potentially block the server for a long time if called against large databases.