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

How do you cancel a queued Redis transaction before it executes, and what command is used for this?

Beginner

Answer

You use the DISCARD command, which cancels the current transaction and clears all commands that were queued after MULTI was called, returning the connection to its normal state without executing any of the queued commands.
MULTI
SET temp_key 'value'
DISCARD
Real-world example An application starts building a transaction but decides midway through, based on some application logic, that the operation should not proceed, so it calls DISCARD to safely cancel everything queued so far.

Common follow-ups: Does DISCARD affect commands that were already executed outside the transaction?;What is the difference between DISCARD and simply not calling EXEC?

Lua Scripting;Distributed Locks with Redis
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