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
| Format | Option File | Description | Introduction | Deprecated | Removed |
|---|---|---|---|---|---|
| -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 |
Display a help message and exit.
Do not abstract all numbers to
Nand strings to'S'.--debug,-dRun in debug mode.
Consider only queries that match the (grep-style) pattern.
Host name of MySQL server for
*-slow.logfile name. The value can contain a wildcard. The default is*(match all).Name of server instance (if using mysql.server startup script).
Do not subtract lock time from total time.
Abstract numbers with at least
Ndigits within names.Reverse the sort order.
How to sort the output. The value of
sort_typeshould be chosen from the following list:t,at: Sort by query time or average query timel,al: Sort by lock time or average lock times,as: Sort by rows sent or average rows sentc: Sort by count
By default, mysqldumpslow sorts by average query time (equivalent to
-s at).Display only the first
Nqueries in the output.--verbose,-vVerbose 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