Command	Description
scan 0 match *pattern* count number	迭代数据库中的数据库键，产用于模糊搜索某 key ，非全量搜索
keys *pattern*	查询当前库指定 key
dbsize	当前数据库的 key 的数量。

Command	Description
used_memory	内存总量，以字节（byte）为单位
used_memory_human	内存总量，以人类可读的格式展示
used_memory_rss	已分配的内存总量（常驻内存大小，单位为 byte ）。这个值和 top、ps 等命令的输出一致。
used_memory_rss_human	与 used_memory_rss 相同，以人类可读的格式展示
used_memory_peak	内存消耗峰值（以字节为单位）
used_memory_peak_human	used_memory_rss/used_memory 的比例。一般情况下，used_memory_rss 略高于 used_memory，当内存碎片较多时，则 mem_fragmentation_ratio 会较大，可以反映内存碎片是否很多

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Command	Description
APPEND keyvalue	Append
BITCOUNT key [ start stop ]	Count #of set bits
BITOP AND dest[src]+	Bitwise AND
BITOP OR dest[src]+	Bitwise OR
BITOP XOR dest[src]+	Bitwise XOR
BITOP NOT destsrc	Bitwise NOT
BITPOS keybit[startstop]	Find first set bit
DECR key	Decrement integer
DECRBY keyby	Subtract from integer
GET key	Get by key
GETBIT keyoffset	Get bit by index
GETRANGE keystartend	Get substring
GETSET keyvalue	Set,returning old value
INCR key	Increment integer
INCRBY keyby	Add to integer
INCRBYFLOAT keyby	Add to float
MGET [key]+	Get multiple
MSET [keyvalue]+	Set multiple
MSETNX [keyvalue]+	Set multiple if doesn’texist
PSETEX keymsvalue	Set with expiry(ms)
SET keyvalue	Set
SETBIT keyoffsetvalue	Set bit by index
SETEX keysecsvalue	Set with expiry(s)
SETNX keyvalue	Set if doesn’t exist
SETRANGE keyoffsetvalue	Set substring
STRLEN key	Get length

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Strings can be used as numbers,arrays,bit sets and binary data

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Command	Description
DEL [ key ]+	Delete item (s)
DUMP key	Serialise item
EXISTS [ key ]+	Check for key
EXPIRE keys	Set timeout on item
EXPIREAT keyts	Set timeout by timestamp
KEYS pattern	Get keys matching pattern
MIGRATE	Transfer item between instances
MOVE keydb	Transfer item between databases
OBJECT	Inspect item
PERSIST key	Remove timeout
PEXPIRE keyms	Set timeout(ms)
PEXPIREAT keyts	Set timeout(timestamp)
PTTL key	Get item TTL(ms)
RANDOMKEY	Get random key
RENAME key new	Change item’skey
RENAMENX keynew	Change key if new key doesn’t exist
RESTORE key	Deserialise
SCAN keycursor[MATCH pattern][countcount]	Iterate keys
SORT	Get or store sorted copy
TTL key	Get item TTL (s)
TYPE key	Get type of item

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• Times are specified in seconds(s) or milliseconds(ms)*
• Timestamps(s) are specified as seconds since January1,1970*

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Hashes
HDEL key [ field ]+	Delete field(s)
HEXISTS key field	Check for field
HGET key field	Get item
HGETALL key	Return all fields/values
HINCRBY key field by	Add to integer value
HINCRBYFLOAT key field by	Add to float value
HKEYS key	Return all fields
HLEN key	Get number of fields
HMGET key[field] +	Get multiple items
HMSET key[field value] +	Set multiple items
HSCAN key cursor[MATCH pattern][countcount]	Iterate fields
HSET key field value	Set field
HSETNX key field value	Set field if doesn’t exist
HSTRLEN key field	Get string length of field
HVALS key	Return all values

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Sets
SADD key [ member ]+	向集合添加一个或多个成员
SCARD key	获取集合的成员数
SDIFF [key]+	返回第一个集合与其他集合之间的差异
SDIFFSTORE dest [key]+	Store difference
SINTER [key]+	Intersection
SINTERSTORE dest [key]+	Store intersection
SISMEMBER keymember	Check for item
SMEMBERS key	Get all
SMOVE srcdest member	Move item to another set
SPOP key[count]?	Pop random item
SRANDMEMBER key[count]	Get random item
SREM key[member]+	Remove matching
SSCAN key cursor[MATCH pattern][countcount]	Iterate items
SUNION[key]+	Union
SUNIONSTORE dest [key]+	Store union

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SortedSets
ZADD key[options][score additem item] +	Add item
ZCARD key	Get number of items
ZCOUNT key min max	Number of items with score range
ZINCRBY key incrmember	Add to score
ZINTERSTORE	Store intersection
ZLEXCOUNT key min max	Lexicographical range count
ZRANGE key start stop [WITHSCORES]	Get items within rank range
ZRANGEBYLEX key min max[ LIMIT offset count]	Get items within lexicographical range
ZRANGEBYSCORE key min max [WITHSCORES][limit offset count]	Get items within score range
ZRANK key member	Get item rank
ZREM key [member]+	Remove item(s)
ZREMRANGEBYLEX key min max	Remove items within lexicographical range
ZREMRANGEBYRANK key start stop	Remove items within rank range
ZREMRANGEBYSCORE key min max	Remove items within score range
ZREVRANGE	ZRANGE inreverse order
ZREVRANGEBYLEX	ZRANGEBYLEX inreverse order
ZREVRANGEBYSCORE	ZRANGEBYSCORE inreverse order
ZREVRANK	ZRANK inreverse order
ZSCAN key cursor [MATCH pattern][count count]	Iterate items
ZSCORE keymember	Get item score
ZUNIONSTORE dest numkeys [ key ]+ [ WEIGHTS [ weight ]+ ] [ AGGREGATE SUM[MIN][MAX] ]	Store union

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Lists
BLPOP [key]+timeout	Blocking left pop
BLPOP [key]+timeout	Blocking left pop
BRPOP [key]+timeout	Blocking right pop
BRPOPLPUSH src dest timeout	Blocking rotate
LINDEX key index	Access by index
LINSERT key BEFORE[AFTER] pivot value	Insert next to
LLEN key	Get length
LPOP key	Pop from start
LPUSH key[value]+	Push onto start
LPUSHX key value	Push if list exists
LRANGE key start stop	Access range
LREM key count value	Remove occurrences
LSET key index value	Set item by index
LTRIM list start stop	Removes tart/end items
RPOP key	Pop from end
RPOPLPUSH src dest	Rotate
RPUSH key[value]+	Push onto end
RPUSHX key value	Push onto end if list exists

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Scripts
AUTH password	Request authentication
ECHO message	Return message
PING	Test connection
QUIT	Close connection
SELECT index	Set current database by index

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Scripts
EVAL	Run
EVALSHA	Run cached
SCRIPT EXISTS	Check by hash
SCRIPT FLUSH	Clear cache
SCRIPT KILL	Kill running script
SCRIPT LOAD	Add to cache

Redis.Cheat.Sheet