————–如何使用mysqldumpslow工具对日志进行分析————–
使用命令查找mysqldumpslow工具路径
1 | find / -name mysqldumpslow |
我的查询返回路径为
1 | /usr/local/mysql/bin/mysqldumpslow |
访问次数最多的10条sql语句
1 | /usr/local/mysql/bin/mysqldumpslow -s c -t 10 /home/wwwlogs/mysql_slow_querys.log |
返回记录最多的20条sql语句
1 | /usr/local/mysql/bin/mysqldumpslow -s r -t 10 /home/wwwlogs/mysql_slow_querys.log |
按照时间返回前10条里面含有left join的sql语句
1 | /usr/local/mysql/bin/mysqldumpslow -t 10 -s t -g “left join” /home/wwwlogs/mysql_slow_querys.log |
使用命令查看mysqldumpslow参数说明
1 | /usr/local/mysql/bin/mysqldumpslow -help |
mysqldumpslow常用参数
1 2 3 4 | -s，是order的顺序，说明写的不够详细，主要有 c,t,l,r和ac,at,al,ar，分别是按照query次数，时间，lock的时间和返回的记录数来排序，前面加了a的时倒序 -t，是top n的意思，即为返回前面多少条的数据 -g，后边可以写一个正则匹配模式，大小写不敏感的 |
mysqldumpslow完整参数说明如下：
–verbose verbose
–debug debug
–help write this text to standard output
-v verbose
-d debug
-s ORDER what to sort by (al, at, ar, c, l, r, t), ‘at’ is default
al: average lock time
ar: average rows sent
at: average query time
c: count
l: lock time
r: rows sent
t: query time
-r reverse the sort order (largest last instead of first)
-t NUM just show the top n queries
-a don’t abstract all numbers to N and strings to ‘S’
-n NUM abstract numbers with at least n digits within names
-g PATTERN grep: only consider stmts that include this string
-h HOSTNAME hostname of db server for *-slow.log filename (can be wildcard),
default is ‘*’, i.e. match all
-i NAME name of server instance (if using mysql.server startup script)
-l don’t subtract lock time from total time
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