mysqldumpslow - Summarize slow query log files


mysqldumpslow [options] [log_file ...]


The MySQL slow query log contains information about queries that take a long time to execute (see Section 5.2.5, \(lqThe Slow Query Log\(rq). mysqldumpslow parses MySQL slow query log files and prints a summary of their contents.

Normally, mysqldumpslow groups queries that are similar except for the particular values of number and string data values. It \(lqabstracts\(rq these values to N and 'S' when displaying summary output. The -a and -n options can be used to modify value abstracting behavior.

Invoke mysqldumpslow like this:

shell> mysqldumpslow [options] [log_file ...]

mysqldumpslow supports the following options.


o --help

Display a help message and exit.


o -a

Do not abstract all numbers to N and strings to 'S'.


o --debug, -d

Run in debug mode.


o -g pattern

Consider only queries that match the (grep-style) pattern.


o -h host_name

Host name of MySQL server for *-slow.log file name. The value can contain a wildcard. The default is * (match all).


o -i name

Name of server instance (if using mysql.server startup script).


o -l

Do not subtract lock time from total time.


o -n N

Abstract numbers with at least N digits within names.


o -r

Reverse the sort order.


o -s sort_type

How to sort the output. The value of sort_type should be chosen from the following list:


o t, at: Sort by query time or average query time


o l, al: Sort by lock time or average lock time


o s, as: Sort by rows sent or average rows sent


o c: Sort by count

  By default, mysqldumpslow sorts by average query time (equivalent to -s at).


o -t N

Display only the first N queries in the output.


o --verbose, -v

Verbose mode. Print more information about what the program does.

Example of usage:

shell> mysqldumpslow Reading mysql slow query log from /usr/local/mysql/data/mysqld51-apple-slow.log Count: 1 Time=4.32s (4s) Lock=0.00s (0s) Rows=0.0 (0), root[root]@localhost insert into t2 select * from t1 Count: 3 Time=2.53s (7s) Lock=0.00s (0s) Rows=0.0 (0), root[root]@localhost insert into t2 select * from t1 limit N Count: 3 Time=2.13s (6s) Lock=0.00s (0s) Rows=0.0 (0), root[root]@localhost insert into t1 select * from t1


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For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online at


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