SAVE
Synchronously snapshot the dataset to disk.
SAVEComplexity
O(S) fan-out; O(N/S) copy-on-write freeze per shard
Complexity and compatibility are read out of kevy's implementation, not copied from Redis's reference. Several genuinely differ.
Redis compatibility
Differs
SAVE is no longer synchronous-until-durable — it freezes a copy-on-write view and replies OK immediately, so 'SAVE returned, therefore the dump is safe to copy' no longer holds
See also
BGREWRITEAOFBGSAVECLIENTCLUSTERCOMMANDCONFIGDBSIZEDEBUGFLUSHALLFLUSHDBINFOMEMORYSHUTDOWNSLOWLOG