Redis常用命令解析INFO,MONITOR,SLOWLOG

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Redis常用命令解析INFO,MONITOR,SLOWLOG

Redis常用命令解析INFO,MONITOR,SLOWLOG:作者：zhanhailiang 日期：2014-12-02 1. INFO info指令返回服務器相關信息，包括： server: General information about the Redis server clients: Client connections section memory: Memory consumpti

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導讀Redis常用命令解析INFO,MONITOR,SLOWLOG:作者：zhanhailiang 日期：2014-12-02 1. INFO info指令返回服務器相關信息，包括： server: General information about the Redis server clients: Client connections section memory: Memory consumpti

作者：zhanhailiang 日期：2014-12-02 1. INFO info指令返回服務器相關信息，包括： server: General information about the Redis server clients: Client connections section memory: Memory consumption related information persistence: RDB and AOF r

 作者：zhanhailiang 日期：2014-12-02

1. INFO

info指令返回服務器相關信息，包括：

server: General information about the Redis server

clients: Client connections section

memory: Memory consumption related information

persistence: RDB and AOF related information

stats: General statistics

replication: Master/slave replication information

cpu: CPU consumption statistics

commandstats: Redis command statistics

cluster: Redis Cluster section

keyspace: Database related statistics

其本身支持定制返回列表：

[root@~]# redis-cli info
[root@~]# redis-cli info default
[root@~]# redis-cli info all

詳情請見：http://www.redis.cn/commands/info.html

2. MONITOR

MONITOR是一個調試命令，返回服務器處理的每一個命令，它能幫助我們了解在數據庫上發生了什么操作。共有3種操作方法：

[root@~]# redis-cli monitor
OK
1417532512.619715 [0 127.0.0.1:55043] "REPLCONF" "ACK" "6623624"
[root@~]# telnet 127.0.0.1 6379
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
monitor
+OK
+1417532567.733458 [0 127.0.0.1:55043] "REPLCONF" "ACK" "6623708"
+1417532568.735936 [0 127.0.0.1:55043] "REPLCONF" "ACK" "6623708"
quit
+OK
Connection closed by foreign host.
[root@~]# redis-cli 
127.0.0.1:6379> monitor
OK
1417532590.785487 [0 127.0.0.1:55043] "REPLCONF" "ACK" "6623736"

由于MONITOR命令返回服務器處理的所有的命令, 所以在性能上會有一些消耗。使用官方的壓測工具測試結果如下

在不運行MONITOR命令的情況下，benchmark的測試結果:

[root@~/software/redis-2.8.17]# src/redis-benchmark -c 10 -n 100000 -q
PING_INLINE: 51020.41 requests per second
PING_BULK: 50607.29 requests per second
SET: 37257.82 requests per second
GET: 49800.80 requests per second
INCR: 38699.69 requests per second
LPUSH: 38910.51 requests per second
LPOP: 39277.30 requests per second
SADD: 54614.96 requests per second
SPOP: 51948.05 requests per second
LPUSH (needed to benchmark LRANGE): 38819.88 requests per second
LRANGE_100 (first 100 elements): 20112.63 requests per second
LRANGE_300 (first 300 elements): 9025.27 requests per second
LRANGE_500 (first 450 elements): 6836.67 requests per second
LRANGE_600 (first 600 elements): 5406.28 requests per second
MSET (10 keys): 19394.88 requests per second

在運行MONITOR命令的情況下，benchmark的測試結果: (redis-cli monitor > /dev/null):

[root@~/software/redis-2.8.17]# src/redis-benchmark -c 10 -n 100000 -q
PING_INLINE: 42211.91 requests per second
PING_BULK: 42936.88 requests per second
SET: 26143.79 requests per second
GET: 33990.48 requests per second
INCR: 26553.37 requests per second
LPUSH: 27337.34 requests per second
LPOP: 27225.70 requests per second
SADD: 30459.95 requests per second
SPOP: 39494.47 requests per second
LPUSH (needed to benchmark LRANGE): 26315.79 requests per second
LRANGE_100 (first 100 elements): 22055.58 requests per second
LRANGE_300 (first 300 elements): 8104.38 requests per second
LRANGE_500 (first 450 elements): 6371.05 requests per second
LRANGE_600 (first 600 elements): 5031.95 requests per second
MSET (10 keys): 14861.05 requests per second

可以看到各項指標基本都有所下降。

詳情請見：http://www.redis.cn/commands/monitor.html

3. SLOWLOG

通過SLOWLOG可以讀取慢查詢日志。

使用SLOWLOG LEN就可以獲取當前慢日志長度。

[root@~/software/redis-2.8.17]# redis-cli 
127.0.0.1:6379> slowlog len
(integer) 28

使用SLOWLOG GET就可以獲取所有慢日志。

127.0.0.1:6379> slowlog get 
 1) 1) (integer) 27
 2) (integer) 1417531320
 3) (integer) 24623
 4) 1) "info"

其中，各項指標表示：

A unique progressive identifier for every slow log entry.

The unix timestamp at which the logged command was processed.

The amount of time needed for its execution, in microseconds（注意，microseconds翻譯成微秒，而不是毫秒）.

The array composing the arguments of the command.

使用SLOWLOG GET N就可以獲取最近N條慢日志。

127.0.0.1:6379> slowlog get 2
1) 1) (integer) 27
 2) (integer) 1417531320
 3) (integer) 24623
 4) 1) "info"
2) 1) (integer) 26
 2) (integer) 1417528379
 3) (integer) 21363
 4) 1) "get"
 2) "user:score"

使用SLOWLOG RESET命令重置慢日志。一旦執行，將丟失以前的所有慢日志。