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
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
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
Example of usage:
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
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2010-2015 MariaDB Foundation
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MariaDB 10.1 14/12/2015 MYSQLDUMPSLOW(1)