MYSQLDUMPSLOW(1)

NAME
mysqldumpslow - Summarize slow query log files

SYNOPSIS

mysqldumpslow [options] [log_file ...]

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/mysqld84-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 © 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
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
Oracle Corporation (http://dev.mysql.com/).