mysql 慢查询

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vim my.conf

log-queries-not-using-indexes  = 0  #把慢查询以及执行时没有使用索引的查询命令全都记入日志(其余同--log-slow-queries选项)。slow-query-log                 = 1long_query_time                = 2  #慢查询的执行用时上限(默认设置是10s)。slow-query-log-file            = /data/mysql/mysql-slow.log

show variables like “%slow%”; #查看慢查询配置

  --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 //排序  常用                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)//逆序  -t NUM       just show the top n queries //top NUM 常用  -a           don't abstract all numbers to N and strings to 'S' //不使用N S来代替‘变量’  -n NUM       abstract numbers with at least n digits within names  -g PATTERN   grep: only consider stmts that include this string // grep ‘string’常用  -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

mysqldumpslow -s t -t 10 -a -g "like" /log/mysql/slowbak.log #按查询时间排序包括like字符的前十个

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