--------------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
find / -name mysqldumpslow
我的查询返回路径为
/usr/local/mysql/bin/mysqldumpslow
访问次数最多的10条sql语句
/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
/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
/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
/usr/local/mysql/bin/mysqldumpslow -help
mysqldumpslow常用参数
-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
