Redis MULTI/EXEC: Atomic Transactions for Data Consistency

Redis MULTI/EXEC is a transactional command in Redis that allows a client to group several commands together and execute them as a single atomic operation.

The MULTI command indicates the start of a transaction, and all subsequent commands issued by the client are queued up to be executed as a single atomic operation. The EXEC command then executes all of the queued commands in a single step. If any of the commands fail, the entire transaction is rolled back and none of the changes are applied.

This allows clients to perform multiple operations on Redis data structures as a single atomic unit, ensuring that the data remains consistent and avoiding race conditions that might arise if multiple clients were accessing the same data simultaneously.

Example usage:

MULTI
SET 'key1' 'value1'
INCR 'key2'
EXEC

In this example, the client is setting the value of a key 'key1' to 'value1' and incrementing the value of another key 'key2' by 1. These commands are queued up as a single transaction using MULTI, and then executed together using EXEC. If either command fails, the entire transaction will be rolled back and none of the changes will be applied.