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:
mysqldumpslow [options] [log_file ...]
Example output with no options given:
Reading mysql slow query log from /usr/local/mysql/data/mysqld57-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 4.24 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 |
-
Command-Line Format --help
Display a help message and exit.
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.-
Type String Consider only queries that match the (grep-style) pattern.
-
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). -
Type String Name of server instance (if using mysql.server startup script).
Do not subtract lock time from total time.
-
Type Numeric Abstract numbers with at least
N
digits within names. Reverse the sort order.
-
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 timel
,al
: Sort by lock time or average lock timer
,ar
: Sort by rows sent or average rows sentc
: Sort by count
By default, mysqldumpslow sorts by average query time (equivalent to
-s at
). -
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.