Seven NoSQL Databases in a Week

Using the KEYS command

In Redis, the KEYS command can be used to perform exhaustive pattern matching on all stored keys. This is not advisable, as running this on an instance with a large number of keys could take a long time to complete, and will slow down the Redis instance in the process. In the relational world, this is equivalent to running an unbound query (SELECT...FROM without a WHERE clause). Execute this type of operation with care, and take necessary measures to ensure that your tenants are not performing a KEYS operation from within their application code.