MYSQLDUMPSLOW(1) MySQL Database System MYSQLDUMPSLOW(1)

# [NAME](#NAME)

mysqldumpslow - Summarize slow query log files

# [SYNOPSIS](#SYNOPSIS)

**mysqldumpslow \[options] \[log\_file ...]**

# [DESCRIPTION](#DESCRIPTION)

The MySQL slow query log contains information about queries that take a long time to execute (see Section 7.4.5, “The Slow Query Log”). **mysqldumpslow** parses MySQL slow query log files and summarizes 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. To modify value abstracting behavior, use the **-a** and **-n** options.

Invoke **mysqldumpslow** like this:

```
mysqldumpslow [options] [log_file ...]
```

Example output with no options given:

```
Reading mysql slow query log from /usr/local/mysql/data/mysqld80-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
```

**mysqldumpslow** supports the following options.

•**--help**

**Command-Line Format** --help

Display a help message and exit.

•**-a**

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

•**--debug**, **-d**

**Command-Line Format** --debug

Run in debug mode.

This option is available only if MySQL was built using **WITH\_DEBUG**. MySQL release binaries provided by Oracle are *not* built using this option.

•**-g pattern**

**Type** String

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

•**-h host\_name**

**Type** String **Default Value** *

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

•**-i name**

**Type** String

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

•**-l** Do not subtract lock time from total time.

•**-n N**

**Type** Numeric

Abstract numbers with at least *N* digits within names.

•**-r** Reverse the sort order.

•**-s sort\_type**

**Type** String **Default Value** at

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**

**Type** Numeric

Display only the first *N* queries in the output.

•**--verbose**, **-v**

**Command-Line Format** --verbose

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

# [COPYRIGHT](#COPYRIGHT)

Copyright © 1997, 2026, Oracle and/or its affiliates.

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 http://www.gnu.org/licenses/.

# [SEE ALSO](#SEE_ALSO)

For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online at http://dev.mysql.com/doc/.

# [AUTHOR](#AUTHOR)

Oracle Corporation (http://dev.mysql.com/).

03/23/2026 MySQL 8.0

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Document: mysqldumpslow(1) from mysql-8.0 8.0.46-r11 (Chainguard OS)
Source: https://github.com/mysql/mysql-server