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What is a Redis transaction, and how do the MULTI and EXEC commands work together to create one? 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 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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What does it mean for Redis transactions to lack full rollback support, and how does this differ from transactions in a traditional relational database?

Intermediate

Answer

Unlike a relational database, Redis does not roll back earlier successful commands within a transaction if a later command in the same transaction fails at runtime, since Redis treats runtime errors as isolated to that specific command, meaning your application must be designed with this behavior in mind rather than assuming automatic rollback protection.
MULTI
SET key1 'value1'
INCR key1  -- fails at runtime since key1 is not an integer
EXEC        -- key1 'value1' remains set, only INCR fails
Real-world example A developer migrating from a relational database learns that a Redis transaction will still keep an earlier successful SET command even if a later command in the same transaction fails, and adjusts the application logic accordingly.

Common follow-ups: What is the difference between a queuing time error and a runtime error inside a transaction?;How should an application handle a partial failure within a Redis transaction?

Lua Scripting;Redis Architecture & Installation
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