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Cluster cluster addslots(集群 槽位) cluster count failure reports(集群計(jì)數(shù)失敗報(bào)告) cluster countkeysinslot cluster delslots cluster failover cluster forget cluster getkeysinslot cluster info cluster keyslot(集群鍵槽) cluster meet cluster nodes(集群節(jié)點(diǎn)) cluster replicate(集群復(fù)制) cluster reset(集群重置) cluster saveconfig cluster set config epoch cluster setslot cluster slaves cluster slots readonly readwrite Connection auth echo ping quit select swapdb Geo geoadd geodist geohash geopos georadius georadiusbymember Hashes hdel hexists hget hgetall hincrby hincrbyfloat hkeys hlen hmget hmset hscan hset hsetnx hstrlen hvals HyperLogLog pfadd pfcount pfmerge Keys del dump exists expire expireat keys migrate move object persist pexpire pexpireat pttl randomkey rename renamenx restore scan sort touch ttl type unlink wait Lists blpop brpop brpoplpush lindex linsert llen lpop lpush lpushx lrange lrem lset ltrim rpop rpoplpush rpush rpushx Pub/Sub psubscribe publish pubsub punsubscribe subscribe unsubscribe Scripting eval evalsha script debug script exists script flush script kill script load Server bgrewriteaof bgsave client getname client kill client list client pause client reply client setname command command count command getkeys command info config get config resetstat config rewrite config set dbsize debug object debug segfault flushall flushdb info lastsave monitor role save shutdown slaveof slowlog time Sets sadd scard sdiff sdiffstore sinter sinterstore sismember smembers smove spop srandmember srem sscan sunion sunionstore Sorted Sets zadd zcard zcount zincrby zinterstore zlexcount zrange zrangebylex zrangebyscore zrank zrem zremrangebylex zremrangebyrank zremrangebyscore zrevrange zrevrangebylex zrevrangebyscore zrevrank zscan zscore zunionstore Strings append bitcount bitfield bitop bitpos decr decrby get getbit getrange getset incr incrby incrbyfloat mget mset msetnx psetex set setbit setex setnx setrange strlen Transactions discard exec multi unwatch watch
characters

TTL key

自1.0.0起可用。

時(shí)間復(fù)雜度: O(1)

返回具有超時(shí)的密鑰的剩余生存時(shí)間。這種內(nèi)省功能允許Redis客戶端檢查給定密鑰將繼續(xù)成為數(shù)據(jù)集的一部分的秒數(shù)。

在 Redis 2.6 或更高版本中,-1如果密鑰不存在或者密鑰存在但沒有關(guān)聯(lián)到期,則該命令將返回。

從 Redis 2.8 開始,錯(cuò)誤發(fā)生時(shí)的返回值發(fā)生了變化:

  • -2如果該鍵不存在,則該命令返回。

  • -1如果密鑰存在但沒有關(guān)聯(lián)過期,則該命令返回。

另請(qǐng)參閱以毫秒分辨率返回相同信息的 PTTL 命令(僅在 Redis 2.6 或更高版本中可用)。

返回值

整數(shù)回復(fù):TTL 以秒為單位,或者為負(fù)值以指示錯(cuò)誤(請(qǐng)參閱上述說明)。

例子

redis>  SET mykey "Hello" "OK" 

redis>  EXPIRE mykey 10 (integer) 1 

redis>  TTL mykey (integer) 10

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