Redis 设计与实现 --排序慢查询日志监视器

Posted 2020-10-26 K战神

一、排序

SORT <key>  对一个数字值的key进行排序

1、alpha 对字符串类型的键进行排序

2、asc / desc

　 redis 默认升序排序asc

     desc 与之相反

3、by 

　  根据权重排序。　

127.0.0.1:6379> sadd usres "vip" "ordinary" "visotor"
(integer) 3
127.0.0.1:6379> sort usres alpha
1) "ordinary"
2) "vip"
3) "visotor"
127.0.0.1:6379> mset vip-sort 1 ordinary-sort 0 visotor-sort -1
OK
127.0.0.1:6379> sort usres by *-sort
1) "visotor"
2) "ordinary"
3) "vip"
127.0.0.1:6379>

 4、limit <从哪开始><娶几个>

127.0.0.1:6379> sort usres alpha limit 0 2
1) "ordinary"
2) "vip"
127.0.0.1:6379>

 

5、get

通过get模式匹配后格式化

127.0.0.1:6379> sort usres alpha
1) "ordinary"
2) "vip"
3) "visotor"
127.0.0.1:6379>

 

127.0.0.1:6379> set vip "sc"
OK
127.0.0.1:6379> set ordinary "kk"
OK
127.0.0.1:6379> set visotor "123ewdfrgv"
OK
127.0.0.1:6379> sort usres alpha get *
1) "kk"
2) "sc"
3) "123ewdfrgv"
127.0.0.1:6379>

 

6、store  保存排序结果

127.0.0.1:6379> sort usres alpha get * store names
(integer) 3
127.0.0.1:6379> lrange names 0 -1
1) "kk"
2) "sc"
3) "123ewdfrgv"
127.0.0.1:6379>

 

7、上述选项执行顺序

a、排序： alpha 、asc 、 desc 、 by

b、限制结果集：limit

c、获取外部键：get

d、保存排序结果：store

 

二、慢查询日志

设置超时毫秒数：slowlog-slower-than

127.0.0.1:6379> config set slowlog-slower-than 0
OK

 

设置最大记录数量：slowlog-max-len

127.0.0.1:6379> config set slowlog-max-len 3
OK

 

查看日志 ：slowlog get

127.0.0.1:6379> set sc "sun"
OK
127.0.0.1:6379> set y "yuan"
OK
127.0.0.1:6379> set c "ong"
OK
127.0.0.1:6379> slowlog get
1) 1) (integer) 8           //日志主键
   2) (integer) 1520643052 //时间戳
   3) (integer) 4          //时长
   4) 1) "set"             //命令以及参数
      2) "c"
      3) "ong"
   5) "127.0.0.1:34010"
   6) ""
2) 1) (integer) 7
   2) (integer) 1520643032
   3) (integer) 3
   4) 1) "set"
      2) "y"
      3) "yuan"
   5) "127.0.0.1:34010"
   6) ""
3) 1) (integer) 6
   2) (integer) 1520643024
   3) (integer) 5
   4) 1) "set"
      2) "sc"
      3) "sun"
   5) "127.0.0.1:34010"
   6) ""

 

 

三、监视器  monitor

监视器客户端执行：

127.0.0.1:6379> monitor
OK

 

请求客户端，执行命令：

# redis-cli
127.0.0.1:6379> set name "sc"
OK
127.0.0.1:6379>

 

监视器，监视：

127.0.0.1:6379> monitor
OK
1520643372.474104 [0 127.0.0.1:34012] "COMMAND"
1520643389.095506 [0 127.0.0.1:34012] "set" "name" "sc"