Removes the expiration time of a key.
PERSIST key
Remove the existing timeout on key, turning the key from
volatile (a key with an expire set) to persistent (a
key that will never expire as no timeout is associated).
One of the following:
Integer reply:
0 if key does not exist or does not have an
associated timeout.
Integer reply:
1 if the timeout has been removed.
O(1)
@fast @keyspace @write
127.0.0.1:6379> SET mykey "Hello"
OK
127.0.0.1:6379> EXPIRE mykey 10
(integer) 1
127.0.0.1:6379> TTL mykey
(integer) 10
127.0.0.1:6379> PERSIST mykey
(integer) 1
127.0.0.1:6379> TTL mykey
(integer) -1COPY, DEL, DUMP, EXISTS, EXPIRE, EXPIREAT, EXPIRETIME, KEYS, MIGRATE, MOVE, OBJECT, OBJECT ENCODING, OBJECT FREQ, OBJECT HELP, OBJECT IDLETIME, OBJECT REFCOUNT, PEXPIRE, PEXPIREAT, PEXPIRETIME, PTTL, RANDOMKEY, RENAME, RENAMENX, RESTORE, SCAN, SORT, SORT_RO, TOUCH, TTL, TYPE, UNLINK, WAIT, WAITAOF.