4.6.8. mysqldumpslow — Summarize Slow Query Log Files

The MySQL slow query log contains information about queries that take a long time to execute (see Section 5.2.5, “The Slow Query Log”). mysqldumpslow parses MySQL 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 abstracting behavior.

Invoke mysqldumpslow like this:

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

mysqldumpslow supports the following options.

Table 4.12. mysqldumpslow Options

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

    • s, as: 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.

Example of usage:

shell> mysqldumpslow

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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