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4.6.9 mysqldumpslow — Summarize Slow Query Log Files

The MySQL slow query log contains information about queries that take a long time to execute (see Section 5.4.5, “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: 

shell> mysqldumpslow [options] [log_file ...]

Example of usage: 

shell> mysqldumpslow

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.

Table 4.22 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

    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 MySQL 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 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, 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

    Display only the first N queries in the output.

  • --verbose, -v

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


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Document created the 26/06/2006, last modified the 26/10/2018
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