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mariadb-dumpslow - Summarize slow query log files (mysqldumpslow is now a symlink to mariadb-dumpslow)


mysqldumpslow [options] [log_file ...]


The MariaDB slow query log contains information about queries that take a long time to execute. mysqldumpslow parses MariaDB 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 “abstracts” 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.


Display a help message and exit.


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

--debug, -d

Run in debug mode.

-g pattern

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

-h host_name

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

-i name

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


Do not subtract lock time from total time.

-n N

Abstract numbers with at least N digits within names.


Reverse the sort order.

-s sort_type

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

•t, aa: Sort by rows affected or average rows affected

•l, ae: Sort by rows examined or aggregate rows examined

•l, at: Sort by query time or average query time

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

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

•c: Sort by count

-t N

Display only the first N queries in the output.

--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


Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc., 2010-2020 MariaDB Foundation

This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License.

This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA or see


For more information, please refer to the MariaDB Knowledge Base, available online at


MariaDB Foundation (

15 May 2020 MariaDB 10.11