mariadb-dumpslow1

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

Usage

mariadb-dumpslow [options] [log_file ...]

Overview

The MariaDB slow query log contains information about queries that take a long time to execute. mariadb-dumpslow parses MariaDB slow query log files and prints a summary of their contents.

Normally, mariadb-dumpslow 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 mariadb-dumpslow like this:

shell> mariadb-dumpslow [options] [log_file ...]

mariadb-dumpslow 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 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 mariadb.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, 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> mariadb-dumpslow
Reading mariadb 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

History

Arch Linux 2026-11-01 to Debian 13 (Trixie): the text shown here
Debian 12 (Bookworm)
Debian 11 (Bullseye)