EXEC
Execute every command queued since MULTI.
EXECComplexity
O(sum of the queued commands' costs); with W watched keys, one extra O(W) pre-check fanned into O(min(W,S)) messages
Complexity and compatibility are read out of kevy's implementation, not copied from Redis's reference. Several genuinely differ.
Redis compatibility
Differs
a MULTI batch spanning several shards is per-shard-atomic, not globally isolated (there is no cross-shard snapshot); a queue-time error aborts the whole batch with EXECABORT, but a runtime error inside EXEC leaves the other commands applied, as in Redis