Redis运维之常用命令操作

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在平时的工作中，需要根据需求对Redis数据库进行一些操作。

可以参考Redis官网http://redis.io/commands 进行详细了解

1.SELECT 切换数据库

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redis 127.0.0.1:6379[1]> HELP SELECT   SELECT index   summary: Change the selected database for the current connection   since: 1.0.0   group: connection redis 127.0.0.1:6379[1]> SELECT 2 OK

2.LLEN 得到一个列表的长度

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redis 127.0.0.1:6379[2]> HELP LLEN   LLEN key   summary: Get the length of a list   since: 1.0.0   group: list redis 127.0.0.1:6379[2]> LLEN bi (integer) 412

3.LRANGE 获取一个列表的所有元素

    LRANGE 索引是以0开始的，0表示第一个元素，-1表示最后一个元素

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LRANGE key start stop   summary: Get a range of elements from a list   since: 1.0.0   group: list redis 127.0.0.1:6379[2]> LRANGE bi 0 5

4.LPUSH 将一个或多个值添加到一个列表的开头

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redis 127.0.0.1:6379[2]> HELP LPUSH   LPUSH key value [value ...]   summary: Prepend one or multiple values to a list   since: 1.0.0   group: list redis 127.0.0.1:6379[2]> LPUSH bi http://abc.com/logUserLogin?even ... 21bcef5cba1fc182d18

5.RPUSH 将一个或多个值追加到一个列表的末尾

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redis 127.0.0.1:6379[2]> HELP RPUSH   RPUSH key value [value ...]   summary: Append one or multiple values to a list   since: 1.0.0   group: list redis 127.0.0.1:6379[2]> RPUSH bi http://abc.com/logUserLogin?even ... 21bcef5cba1fc182d18

6.SAVE 同步数据到磁盘

     SAVE命令执行的时候会阻塞连接，所以生成环境最好使用BGSAVE命令

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redis 127.0.0.1:6379[2]> HELP SAVE   SAVE -   summary: Synchronously save the dataset to disk   since: 1.0.0   group: server redis 127.0.0.1:6379[2]> SAVE OK (1.33s)

7.BGSAVE 异步数据到磁盘

    使用BGSAVE,Redis将会在后台执行保存数据的操作，不影响正常的客户端连接，Redis将会fork出一个子进程用于保存数据，父进程继续处理客户端请求。

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redis 127.0.0.1:6379[2]> HELP BGSAVE   BGSAVE -   summary: Asynchronously save the dataset to disk   since: 1.0.0   group: server redis 127.0.0.1:6379[2]> BGSAVE Background saving started

8.TYPE 判断一个KEY的类型

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redis 127.0.0.1:6379[2]> HELP TYPE   TYPE key   summary: Determine the type stored at key   since: 1.0.0   group: generic redis 127.0.0.1:6379[2]> TYPE bi list

9.BGREWRITEAOF   

异步重写AOF文件，Redis将会创建一个对当前AOF文件优化过的AOF版本。

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redis 127.0.0.1:6379> help BGREWRITEAOF   BGREWRITEAOF -   summary: Asynchronously rewrite the append-only file   since: 1.0.0   group: server

10.CONFIG GET   

   获取某个配置项的值

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redis 127.0.0.1:6379> help config get   CONFIG GET parameter   summary: Get the value of a configuration parameter   since: 2.0.0   group: server redis 127.0.0.1:6379> config get maxmemory 1) "maxmemory" 2) "0"

11.CONFIG SET

  设置某个参数的值

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redis 127.0.0.1:6379> help config set   CONFIG SET parameter value   summary: Set a configuration parameter to the given value   since: 2.0.0   group: server redis 127.0.0.1:6379> config set maxmemory 200000000 OK

12.DBSIZE

  返回当前数据库的KEY值得数量

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redis 127.0.0.1:6379[3]> HELP DBSIZE   DBSIZE -   summary: Return the number of keys in the selected database   since: 1.0.0   group: server redis 127.0.0.1:6379[3]> dbsize (integer) 12502

13.DEL

删除一个KEY值

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redis 127.0.0.1:6379> help del   DEL key [key ...]   summary: Delete a key   since: 1.0.0   group: generic redis 127.0.0.1:6379> del foo (integer) 1

14.EXISTS

检查一个KEY是否存在

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redis 127.0.0.1:6379> help exists   EXISTS key   summary: Determine if a key exists   since: 1.0.0   group: generic redis 127.0.0.1:6379> exists foo (integer) 1

15.SET 命令

设置一个KEY的值

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redis 127.0.0.1:6379> help set   SET key value   summary: Set the string value of a key   since: 1.0.0   group: string redis 127.0.0.1:6379> set foo test OK redis 127.0.0.1:6379>

16.PERSIST

删除一个KEY的过期时间

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edis 127.0.0.1:6379> help persist   PERSIST key   summary: Remove the expiration from a key   since: 2.2.0   group: generic

17.RENAME

重新命名一个KEY

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redis 127.0.0.1:6379> help rename   RENAME key newkey   summary: Rename a key   since: 1.0.0   group: generic redis 127.0.0.1:6379> rename foo footest OK redis 127.0.0.1:6379>

18.EXPIRE

为一个KEY设置一个TTL过期时间

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redis 127.0.0.1:6379> help expire   EXPIRE key seconds   summary: Set a key's time to live in seconds   since: 1.0.0   group: generic redis 127.0.0.1:6379> expire footest 300 (integer) 1

19.TTL

获取过期时间

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redis 127.0.0.1:6379> help ttl   TTL key   summary: Get the time to live for a key   since: 1.0.0   group: generic redis 127.0.0.1:6379> ttl footest (integer) 289 redis 127.0.0.1:6379> ttl footest (integer) 285 redis 127.0.0.1:6379> ttl footest (integer) 283 redis 127.0.0.1:6379> ttl footest (integer) 282 redis 127.0.0.1:6379> ttl footest (integer) 282 redis 127.0.0.1:6379>

20.EXPIREAT

设置一个KEY的过期时间，以UNIX时间戳表示

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redis 127.0.0.1:6379> help expireat   EXPIREAT key timestamp   summary: Set the expiration for a key as a UNIX timestamp   since: 1.2.0   group: generic redis 127.0.0.1:6379> expireat foo 1431532800 (integer) 1 redis 127.0.0.1:6379> ttl foo (integer) 3210141

21.GET

获取一个KEY的值

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redis 127.0.0.1:6379> help get   GET key   summary: Get the value of a key   since: 1.0.0   group: string redis 127.0.0.1:6379> get foo "test"

22.HGET

获取一个哈希字段的值

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redis 127.0.0.1:6379> help hget   HGET key field   summary: Get the value of a hash field   since: 2.0.0   group: hash redis 127.0.0.1:6379> hset myhash field1 "foo" (integer) 1 redis 127.0.0.1:6379> hget myhash field1 "foo" redis 127.0.0.1:6379> hget myhash field2 (nil) redis 127.0.0.1:6379>

23.LASTSAVE

上次成功保存数据到磁盘的UNIX时间戳

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redis 127.0.0.1:6379> help lastsave   LASTSAVE -   summary: Get the UNIX time stamp of the last successful save to disk   since: 1.0.0   group: server redis 127.0.0.1:6379> lastsave (integer) 1428373205 redis 127.0.0.1:6379>

24.LPUSH

将一个或多个值附加到一个Redis列表中

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redis 127.0.0.1:6379> help lpush   LPUSH key value [value ...]   summary: Prepend one or multiple values to a list   since: 1.0.0   group: list redis 127.0.0.1:6379> lpush mylist a b c (integer) 6 redis 127.0.0.1:6379> LRANGE mylist  0 -1 1) "c" 2) "b" 3) "a" 4) "c" 5) "b" 6) "a" redis 127.0.0.1:6379> llen mylist (integer) 6