# 設定紀錄sloq file的位置
...
log-slow-queries=/your/path

# 執行時，超過10秒的時候記錄下來
long_query_time=10

# 若要記錄所有 query 可以加下面這行(我沒有加)
log-long-format
...

mysqldumpslow使用说明
mysqldumpslow --help
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 （出现次数）
                l: lock time
                r: rows sent
                t: query time 
 -r           reverse the sort order (largest last instead of first) （由大到小排序）
 -t NUM       just show the top n queries （最高的n個查询）
 -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