mysqldumpslow 是mysql官方提供的一个慢日志分析工具

# mysqldumpslow --help   ----------------------------------------------------//执行命令
Usage: mysqldumpslow [ OPTS... ] [ LOGS... ]
 
Parse and summarize the MySQL slow query log. Options are
 
  --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

s:是表示按照何种方式排序
c:访问次数
i：锁定时间
r：返回记录
t：查询时间
al:平均锁定时间
ar：平均返回记录数
at：平均查询时间
t：即为返回前面多少条数据
g：后边搭配一个正则匹配模式，大小写不敏感

1 访问次数最多的20个sql语句

mysqldumpslow -s c -t 20 1d0a52e2683d-slow.log

2 返回记录集最多的20个sql

mysqldumpslow -s r -t 20 1d0a52e2683d-slow.log

3 得到按照时间排序的前10条里面含有做了连接的查询SQL

mysqldumpslow -s t -t 10 -g “left join” /data/mysql/mysql-slow.log /