UNLINK

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.

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 value

Integer reply: The number of keys that were unlinked.

Examples

redis> SET key1 "Hello" "OK" redis> SET key2 "World" "OK" redis> UNLINK key1 key2 key3 (integer) 2

© 2009–2020 Salvatore Sanfilippo
Licensed under the Creative Commons Attribution-ShareAlike License 4.0.
https://redis.io/commands/unlink