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How do you cancel a queued Redis transaction before it executes, and what command is used for this? How does the WATCH command enable optimistic locking within a Redis transaction? What does it mean for Redis transactions to lack full rollback support, and how does this differ from transactions in a traditional relational database? What is a practical real world example where a Redis transaction ensures data consistency across multiple related keys? When would you choose a Lua script over a MULTI and EXEC transaction to achieve atomicity in Redis? How do Redis transactions interact with Redis Cluster when the queued commands involve keys located on different shards?
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Redis › Transactions

What is a Redis transaction, and how do the MULTI and EXEC commands work together to create one?

Beginner

Answer

A Redis transaction lets you group a series of commands together so they are executed sequentially and atomically as a single unit, starting the group with MULTI, queuing each command that follows, and finally running them all at once with EXEC, ensuring no other client's commands can be interleaved in the middle of your sequence.
MULTI
SET account:1:balance 500
DECRBY account:1:balance 100
EXEC
Real-world example A banking application uses a transaction to update two related account balances together, guaranteeing that both updates happen as one uninterrupted operation from the perspective of every other client.

Common follow-ups: What happens if one command inside a transaction fails while it is being queued?;Can you cancel a transaction before calling EXEC?

Distributed Locks with Redis;Lua Scripting
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