mysqldumpslow — Summarize Slow Query Log Files

本文转载自：http://dev.mysql.com/doc/refman/5.5/en/mysqldumpslow.html

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> [code]mysqldumpslow [options

] [

log_file

...]
[/code]

mysqldumpslow supports
the following options.

Table 4.15

mysqldumpslow

Options

[thead]
[/thead]

Format	Option File	Description
-a		Do not abstract all numbers to N and strings to S
-n num		Abstract numbers with at least the specified digits
--debug	debug	Write 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
--verbose	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.

Example of usage:

shell> [code]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
[/code]

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User Comments

Posted by Muruges Muthu on December 19 2011 2:51pm

[Delete] [Edit]

Count: 19 Time=11.16s (212s) Lock=0.00s (0s) Rows=1.0 (19) ...

Read the results as, this particular query got executed 19 times and 'Time=<Average time taken for one execution 11.16 seconds> (<Time taken for all 19 executions 212 seconds>)' ...

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