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Redis Basic Notes

Redis Commands​

Basic Commands​

  • SET key value.
  • SET key value EX seconds: set key with expire time.
  • SET key value NX: only set key not exists.
  • DEL key.
  • GET key.
  • EXISTS key.
  • KEYS pattern: KEYS *message*.
  • EXPIRE key seconds.
  • TTL key: -1 for no expire time.
  • FLUSHALL.
  • FLUSHDB.

List Commands​

  • LPUSH key element: add head value.
  • RPUSH key element: add tail value.
  • LPOP key [count]: remove and return head value.
  • RPOP key [count]: remove and return tail value.
  • LRANGE key start stop: get elements.
  • LRANGE key 0 -1: get all elements.
  • LTRIM key start stop: trim list to range.
  • LLEN key: get length.

Set Commands​

  • SADD key member: add value.
  • SREM key member: remove value.
  • SPOP key [count]: remove and return random value.
  • SMEMBERS key: get all values.
  • SRANDMEMBER key [count]: get random value.
  • SISMEMBER key member: check value.
  • SCARD key: get length.

SortedSet Commands​

  • ZADD key score member: add value with score.
  • ZREM key member: remove value.
  • ZSCORE key member: get score.
  • ZRANK key member: get rank.
  • ZREVRANK key member: get reverse rank.
  • ZRANGE key start stop: get values.
  • ZRANGE key start stop WITHSCORES: get values with scores.
  • ZCARD key: get length.

Hash Commands​

  • HSET key field value: set field and value.
  • HDEL key field: delete field.
  • HGET key field: get field value.
  • HKEYS key: get all fields.
  • HVALS key: get all values.
  • HGETALL key: get all fields and values.
  • HEXISTS key field: check field.
  • HLEN key: get length.

Pub/Sub Commands​

  • SUBSCRIBE channel: subscribe channel.
  • PUBLISH channel message: publish message to channel.
  • UNSUBSCRIBE channel: unsubscribe channel.

Stream Commands​

  • XADD key id field value: add value.
  • XDEL key id: delete value.
  • XRANGE key start end: get values.
  • XRANGE key - +: get all values.
  • XREAD COUNT count BLOCK milliseconds STREAMS key id: read values.
  • XLEN key: get length.

Stream group:

  • XGROUP CREATE key group id: create group.
  • XGROUP CREATECONSUMER key group consumer: create consumer.
  • XREADGROUP GROUP group consumer COUNT count BLOCK milliseconds STREAMS key id: read values.
  • XINFO GROUPS key: get groups info.

Geospatial Commands​

  • GEOADD key longitude latitude member: add value.
  • GEOPOS key member: get value.
  • GEODIST key member1 member2: get distance.
  • GEOSEARCH key FROMMEMBER member BYRADIUS radius: search by radius.
  • GEORADIUS key longitude latitude radius: search by radius.
  • GEORADIUSBYMEMBER key member radius: search by radius.

HyperLogLog Commands​

使用随机数来统计数量 (基数), 牺牲精度换取性能:

  • PFADD key element: add value.
  • PFCOUNT key: get count.
  • PFMERGE destkey [sourcekey [sourcekey ...]]: merge.

Bitmap Commands​

  • SETBIT key offset value: set value.
  • GETBIT key offset: get value.
  • BITCOUNT key: get count.
  • BITPOS key bit: get first position.
> SET mykey "\xff\xf0\x00"
OK

> BITPOS mykey 0
(integer) 12

Bitfield Commands​

  • BITFIELD key SET type offset value: set value.
  • BITFIELD key GET type offset: get value.
  • BITFIELD key INCRBY type offset increment: increment value.
BITFIELD mystring SET i8 #0 100 SET i8 #1 200
BITFIELD mystring INCRBY i8 #0 10

Transaction Commands​

  • MULTI: start transaction.
  • EXEC: execute transaction.
  • DISCARD: discard transaction.
  • WATCH key: watch key.
  • UNWATCH: unwatch key.

Replication Commands​

主从复制:

  • REPLICAOF NO ONE: master instance.
  • REPLICAOF host port: slave instance.
  • INFO: get info.
> REPLICAOF NO ONE
"OK"

> REPLICAOF 127.0.0.1 6799
"OK"

Sentinel Commands​

> ROLE
1) "sentinel"
2) 1) "resque-master"
   2) "html-fragments-master"
   3) "stats-master"
   4) "metadata-master"