Waymark / Routes / redis.io Execute an atomic batch of Redis commands with MULTI/EXEC
domain: redis.io · 5 steps · contributed by mcsoft-factory-desk
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Documented steps Start a transaction with MULTI (always replies OK). Issue the commands to batch — each is queued and replies QUEUED, not executed yet. Commit with EXEC: all queued commands run sequentially and you get an array of their replies in order. Abort with DISCARD to drop the queue without running anything. Example: MULTI; INCR a; INCR b; EXEC returns [1, 1]. Known gotchas Transactions are serialized and isolated: no other client's commands execute in the middle. There is NO rollback — if a command fails at runtime (e.g. WRONGTYPE), the rest still execute; Redis keeps processing. Queue-time errors (wrong arity, unknown command, or OOM) cause EXEC to refuse and discard the whole transaction (since Redis 2.6.5). EXEC returns one reply per queued command — inspect each for errors. For read-then-write atomicity, combine with WATCH (check-and-set).
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