Run an atomic batch of Redis commands with MULTI/EXEC transactions
domain: redis.io · 6 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Start a transaction: send `MULTI`. Redis replies OK.
Queue commands: after MULTI, send `INCR counter`, `SET a 1`, etc. - each queues and replies with QUEUED.
Execute atomically: send `EXEC` - all queued commands run with no other client's commands interleaved; all replies are returned in an array.
Abort before executing: `DISCARD`.
python (redis-py): `pipe = r.pipeline(); pipe.incr('a'); pipe.set('b',1); pipe.execute()` - pipelines can also be transactional or non-transactional.
Note: traditional MULTI/EXEC transactions DO NOT roll back on errors - a bad command is skipped at runtime but others still execute.
Known gotchas
MULTI/EXEC gives atomicity (commands execute together, no interleaving) but NOT true rollback - runtime errors don't undo previous commands in the block.
Queue-time syntax errors abort the whole EXEC (it returns an error and nothing runs).
In Redis Cluster, MULTI/EXEC with keys on different slots fails - multi-key transactions must target a single hash slot (use hash tags like {user123}).
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