6.6.10 mysqldumpslow — Summarize Slow Query Log Files

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/mysqld91-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.

Table 6.21 mysqldumpslow Options

Option Name	Description
-a	Do not abstract all numbers to N and strings to 'S'
-n	Abstract numbers with at least the specified digits
--debug	Write debugging information
-g	Only consider statements that match the pattern
--help	Display help message and exit
-h	Host name of the server in the log file name
-i	Name of the server instance
-l	Do not subtract lock time from total time
-r	Reverse the sort order
-s	How to sort output
-t	Display only first num queries
--verbose	Verbose mode

• --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.