MYSQLSLAP(1) MySQL Database System MYSQLSLAP(1)
mysqlslap - load emulation client
mysqlslap is a diagnostic program designed to emulate client load for a MySQL server and
to report the timing of each stage. It works as if multiple clients are accessing the
server. mysqlslap is available as of MySQL 5.1.4.
Invoke mysqlslap like this:
shell> mysqlslap [options]
Some options such as --create or --query enable you to specify a string containing an SQL
statement or a file containing statements. If you specify a file, by default it must
contain one statement per line. (That is, the implicit statement delimiter is the newline
character.) Use the --delimiter option to specify a different delimiter, which enables you
to specify statements that span multiple lines or place multiple statements on a single
line. You cannot include comments in a file; mysqlslap does not understand them.
mysqlslap runs in three stages:
1. Create schema, table, and optionally any stored programs or data you want to using for
the test. This stage uses a single client connection.
2. Run the load test. This stage can use many client connections.
3. Clean up (disconnect, drop table if specified). This stage uses a single client
Supply your own create and query SQL statements, with 50 clients querying and 200 selects
mysqlslap --delimiter=";" \
--create="CREATE TABLE a (b int);INSERT INTO a VALUES (23)" \
--query="SELECT * FROM a" --concurrency=50 --iterations=200
Let mysqlslap build the query SQL statement with a table of two INT columns and three
VARCHAR columns. Use five clients querying 20 times each. Do not create the table or
insert the data (that is, use the previous test's schema and data):
mysqlslap --concurrency=5 --iterations=20 \
--number-int-cols=2 --number-char-cols=3 \
Tell the program to load the create, insert, and query SQL statements from the specified
files, where the create.sql file has multiple table creation statements delimited by ';'
and multiple insert statements delimited by ';'. The --query file will have multiple
queries delimited by ';'. Run all the load statements, then run all the queries in the
query file with five clients (five times each):
mysqlslap --concurrency=5 \
--iterations=5 --query=query.sql --create=create.sql \
mysqlslap supports the following options, which can be specified on the command line or in
the [mysqlslap] and [client] option file groups. mysqlslap also supports the options for
processing option files described at Section 220.127.116.11.1, "Command-Line Options that Affect
o --help, -?
Display a help message and exit.
o --auto-generate-sql, -a
Generate SQL statements automatically when they are not supplied in files or via
Add an AUTO_INCREMENT column to automatically generated tables. This option was added
in MySQL 5.1.18.
Specify how many queries to generate automatically. This option was added in MySQL
Add a GUID-based primary key to automatically generated tables. This option was added
in MySQL 5.1.18.
Specify the test load type. The allowable values are read (scan tables), write (insert
into tables), key (read primary keys), update (update primary keys), or mixed (half
inserts, half scanning selects). The default is mixed. This option was added in MySQL
Specify how many secondary indexes to add to automatically generated tables. By
default, none are added. This option was added in MySQL 5.1.18.
How many different queries to generate for automatic tests. For example, if you run a
key test that performs 1000 selects, you can use this option with a value of 1000 to
run 1000 unique queries, or with a value of 50 to perform 50 different selects. The
default is 10. This option was added in MySQL 5.1.18.
How many different queries to generate for --auto-generate-sql-write-number. The
default is 10. This option was added in MySQL 5.1.18.
How many row inserts to perform on each thread. The default is 100. This option was
added in MySQL 5.1.16.
How many statements to execute before committing. The default is 0 (no commits are
done). This option was added in MySQL 5.1.21.
o --compress, -C
Compress all information sent between the client and the server if both support
o --concurrency=N, -c N
The number of clients to simulate when issuing the SELECT statement.
The file or string containing the statement to use for creating the table.
The schema in which to run the tests. This option was added in MySQL 5.1.5.
Generate output in comma-separated values format. The output goes to the named file,
or to the standard output if no file is given. This option was added in MySQL 5.1.5.
o --debug[=debug_options], -# [debug_options]
Write a debugging log. A typical debug_options string is 'd:t:o,file_name'. The
default is 'd:t:o,/tmp/mysqlslap.trace'.
Print some debugging information when the program exits. This option was added in
o --debug-info, -T
Print debugging information and memory and CPU usage statistics when the program
exits. This option was added in MySQL 5.1.21.
Set filename as the file to read default options from after the global defaults files
has been read. Must be given as first option.
Set filename as the file to read default options from, override global defaults files.
Must be given as first option.
o --delimiter=str, -F str
The delimiter to use in SQL statements supplied in files or via command options.
Detach (close and reopen) each connection after each N statements. The default is 0
(connections are not detached). This option was added in MySQL 5.1.21.
o --engine=engine_name, -e engine_name
The storage engine to use for creating tables.
o --host=host_name, -h host_name
Connect to the MySQL server on the given host.
SQL Command to execute when connecting to MySQL server. Will automatically be
re-executed when reconnecting.
o --iterations=N, -i N
The number of times to run the tests.
The directory to use for storing locks. This option was added in MySQL 5.1.5 and
removed in 5.1.18.
Do not read default options from any option file. This must be given as the first
Do not drop the schema after the test.
o --number-char-cols=N, -x N
The number of VARCHAR columns to use if --auto-generate-sql is specified.
o --number-int-cols=N, -y N
The number of INT columns to use if --auto-generate-sql is specified.
Limit each client to approximately this many queries. Query counting takes into
account the statement delimiter. For example, if you invoke mysqlslap as follows, the
; delimiter is recognized so that each instance of the query string counts as two
queries. As a result, 5 rows (not 10) are inserted.
shell> mysqlslap --delimiter=";" --number-of-queries=10
--query="use test;insert into t values(null)"
This option was added in MySQL 5.1.5.
Do not connect to databases. mysqlslap only prints what it would have done. This
option was added in MySQL 5.1.5.
o --password[=password], -p[password]
The password to use when connecting to the server. If you use the short option form
(-p), you cannot have a space between the option and the password. If you omit the
password value following the --password or -p option on the command line, mysqlslap
prompts for one.
Specifying a password on the command line should be considered insecure. See
Section 18.104.22.168, "End-User Guidelines for Password Security". You can use an option
file to avoid giving the password on the command line.
o --pipe, -W
On Windows, connect to the server via a named pipe. This option applies only if the
server supports named-pipe connections.
o --port=port_num, -P port_num
The TCP/IP port number to use for the connection.
The file or string containing the statement to execute after the tests have completed.
This execution is not counted for timing purposes. This option was added in MySQL
On Windows, the shared-memory name to use, for connections made via shared memory to a
local server. This option applies only if the server supports shared-memory
Print the program argument list and exit. This must be given as the first argument.
The string to execute via system() after the tests have completed. This execution is
not counted for timing purposes. This option was added in MySQL 5.1.21.
The file or string containing the statement to execute before running the tests. This
execution is not counted for timing purposes. This option was added in MySQL 5.1.18.
The string to execute via system() before running the tests. This execution is not
counted for timing purposes. This option was added in MySQL 5.1.21.
Preserve the schema from the mysqlslap run. The --auto-generate-sql and --create
options disable this option. This option was added in MySQL 5.1.5 and removed in MySQL
The connection protocol to use for connecting to the server. It is useful when the
other connection parameters normally would cause a protocol to be used other than the
one you want. For details on the allowable values, see Section 4.2.2, "Connecting to
the MySQL Server".
o --query=value, -q value
The file or string containing the SELECT statement to use for retrieving data.
o --silent, -s
Silent mode. No output.
Follow master locks for other mysqlslap clients. Use this option if you are trying to
synchronize around one master server with --lock-directory plus NFS. This option was
added in MySQL 5.1.5 and removed in 5.1.18.
o --socket=path, -S path
For connections to localhost, the Unix socket file to use, or, on Windows, the name of
the named pipe to use.
Options that begin with --ssl specify whether to connect to the server via SSL and
indicate where to find SSL keys and certificates. See Section 22.214.171.124, "SSL Command
On Unix, the default is to use fork() calls and this option causes pthread calls to be
used instead. (On Windows, the default is to use pthread calls and the option has no
effect.) This option was added in MySQL 5.1.6 and removed in 5.1.18.
o --user=user_name, -u user_name
The MySQL user name to use when connecting to the server.
o --verbose, -v
Verbose mode. Print more information about what the program does. This option can be
used multiple times to increase the amount of information.
o --version, -V
Display version information and exit.
Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc.
This documentation is free software; you can redistribute it and/or modify it only under
the terms of the GNU General Public License as published by the Free Software Foundation;
version 2 of the License.
This documentation is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with the program;
if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.
For more information, please refer to the MySQL Reference Manual, which may already be
installed locally and which is also available online at http://dev.mysql.com/doc/.
Sun Microsystems, Inc. (http://www.mysql.com/).
MySQL 5.1 04/06/2010 MYSQLSLAP(1)