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 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 4.18 mysqldumpslow Options
| Format | 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 |
Display a help message and exit.
Do not abstract all numbers to N and
strings to 'S'.
--debug,
-d
Run in debug mode.
Consider only queries that match the (grep-style) pattern.
Host name of MySQL server for
*-slow.log file 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 N
digits within names.
Reverse the sort order.
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).
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