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Section: MySQL Database System (1)
Updated: 06/02/2017
Index Return to Main Contents


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 5.4.5, lqThe Slow Query Logrq). 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 lqabstractsrq 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.

* --help

Display a help message and exit.

* -a

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 MySQL 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).

* -l

Do not subtract lock time from total time.

* -n N

Abstract numbers with at least N digits within names.

* -r

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, at: Sort by query time or average query time

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

* r, ar: Sort by rows sent or average rows sent

* c: Sort by count

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

* -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 © 1997, 2017, Oracle and/or its affiliates. All rights reserved.

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 02110-1301 USA or see



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


Oracle Corporation (




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