Available since 2.1.2.
Time complexity
O(1)
Remove the existing timeout on key.
Return value
Integer reply, specifically:
1if the timeout was removed.0ifkeydoes not exist or does not have an associated timeout.
Examples
redis>
SET mykey "Hello"
OKredis> EXPIRE mykey 10
(integer) 1redis> TTL mykey
(integer) 10redis> PERSIST mykey
(integer) 1redis> TTL mykey
(integer) -1