UNLINK
Syntax
UNLINK key [key ...]
- Available since:
- 4.0.0
- Time complexity:
- O(1) for each key removed regardless of its size. Then the command does O(N) work in a different thread in order to reclaim memory, where N is the number of allocations the deleted objects where composed of.
- ACL categories:
-
@keyspace,@write,@fast,
This command is very similar to DEL: it removes the specified keys.
Just like DEL a key is ignored if it does not exist. However the command
performs the actual memory reclaiming in a different thread, so it is not
blocking, while DEL is. This is where the command name comes from: the
command just unlinks the keys from the keyspace. The actual removal
will happen later asynchronously.
Return
Integer reply: The number of keys that were unlinked.