Redis常用命令解析——INFO, MONITOR, SLOWLOG

时间：2022-10-31 18:28:56

1. INFO

info指令返回服务器相关信息，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

详情请见： http://www.redis.cn/commands/info.html

2. MONITOR

MONITOR是一个调试命令，返回服务器处理的每一个命令，它能帮助我们了解在数据库上发生了什么操作。共有3种操作方法：

[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命令返回服务器处理的所有的命令, 所以在性能上会有一些消耗。使用官方的压测工具测试结果如下

在不运行MONITOR命令的情况下，benchmark的测试结果:

[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

在运行MONITOR命令的情况下，benchmark的测试结果: (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

可以看到各项指标基本都有所下降。

详情请见： http://www.redis.cn/commands/monitor.html

3. SLOWLOG

通过SLOWLOG可以读取慢查询日志。

使用SLOWLOG LEN就可以获取当前慢日志长度。

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

使用SLOWLOG GET就可以获取所有慢日志。

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

其中，各项指标表示：

  • 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翻译成微秒，而不是毫秒）.

  • The array composing the arguments of the command.

使用SLOWLOG GET N就可以获取最近N条慢日志。

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。一旦执行，将丢失以前的所有慢日志。

127.0.0.1:6379> slowlog reset

详情请见： http://www.redis.cn/commands/slowlog.html

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