Redis运维之常用命令操作
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
redis 127.0.0.1:6379> 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> SELECT 2
OK
2.LLEN 得到一个列表的长度
redis 127.0.0.1:6379> HELP LLEN
LLEN key
summary: Get the length of a list
since: 1.0.0
group: list
redis 127.0.0.1:6379> 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
redis 127.0.0.1:6379> HELP LRANGE
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> LRANGE bi 0 5
4.LPUSH 将一个或多个值添加到一个列表的开头
redis 127.0.0.1:6379> HELP LPUSH
LPUSH key value
summary: Prepend one or multiple values to a list
since: 1.0.0
group: list
redis 127.0.0.1:6379> LPUSH bi http://abc.com/logUserLogin?event_id=25&uid=de721bcef5cba1fc182d18
5.RPUSH 将一个或多个值追加到一个列表的末尾
redis 127.0.0.1:6379> HELP RPUSH
RPUSH key value
summary: Append one or multiple values to a list
since: 1.0.0
group: list
redis 127.0.0.1:6379> RPUSH bi http://abc.com/logUserLogin?event_id=25&uid=de721bcef5cba1fc182d18
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
redis 127.0.0.1:6379> HELP SAVE
SAVE -
summary: Synchronously save the dataset to disk
since: 1.0.0
group: server
redis 127.0.0.1:6379> 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。
redis 127.0.0.1:6379> HELP BGSAVE
BGSAVE -
summary: Asynchronously save the dataset to disk
since: 1.0.0
group: server
redis 127.0.0.1:6379> BGSAVE
Background saving started
8.TYPE 判断一个KEY的类型
redis 127.0.0.1:6379> HELP TYPE
TYPE key
summary: Determine the type stored at key
since: 1.0.0
group: generic
redis 127.0.0.1:6379> 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。
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
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
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
redis 127.0.0.1:6379> 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> dbsize
(integer) 12502
13.DEL
删除一个KEY值
redis 127.0.0.1:6379> help del
DEL 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
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
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
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
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
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
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
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
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
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
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
redis 127.0.0.1:6379> help lpush
LPUSH key 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 mylist0 -1
1) "c"
2) "b"
3) "a"
4) "c"
5) "b"
6) "a"
redis 127.0.0.1:6379> llen mylist
(integer) 6
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