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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
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PFADD key element [element ...]

自2.8.9起可用。

時(shí)間復(fù)雜度: O(1)添加每個(gè)元素。

將所有元素參數(shù)添加到以指定為第一個(gè)參數(shù)的變量名稱存儲(chǔ)的HyperLogLog數(shù)據(jù)結(jié)構(gòu)中。

作為該命令的副作用,HyperLogLog 內(nèi)部件可能會(huì)更新以反映迄今為止添加的唯一項(xiàng)目數(shù)量(集合的基數(shù))的不同估計(jì)值。

如果 HyperLogLog 估計(jì)的近似基數(shù)在執(zhí)行命令后發(fā)生改變,則PFADD 返回1,否則返回0。如果指定的鍵不存在,該命令將自動(dòng)創(chuàng)建一個(gè)空的 HyperLogLog 結(jié)構(gòu)(即,具有指定長度和給定編碼的Redis字符串)。

要調(diào)用沒有元素的命令,但只是變量名是有效的,如果變量已經(jīng)存在,這將導(dǎo)致不執(zhí)行任何操作,或者如果該鍵不存在,則只是創(chuàng)建數(shù)據(jù)結(jié)構(gòu)(在后一種情況下返回1) 。

有關(guān) HyperLogLog 數(shù)據(jù)結(jié)構(gòu)的介紹,請(qǐng)查看 PFCOUNT 命令頁面。

返回值

整數(shù)回復(fù),具體為:

  • 1如果至少有1個(gè)HyperLogLog內(nèi)部寄存器被更改。否則為0。

例子

redis>  PFADD hll a b c d e f g (integer) 1 

redis>  PFCOUNT hll (integer) 7

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