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MySQL 8.0 Reference Manual  /  ...  /  mysqlslap — A Load Emulation Client

4.5.8 mysqlslap — A 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.

Invoke mysqlslap like this:

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 to use 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 connection.


Supply your own create and query SQL statements, with 50 clients querying and 200 selects for each (enter the command on a single line):

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 should contain 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] groups of an option file. For information about option files used by MySQL programs, see Section, “Using Option Files”.

Table 4.18 mysqlslap Options

Option Name Description Introduced Deprecated
--auto-generate-sql Generate SQL statements automatically when they are not supplied in files or using command options
--auto-generate-sql-add-autoincrement Add AUTO_INCREMENT column to automatically generated tables
--auto-generate-sql-execute-number Specify how many queries to generate automatically
--auto-generate-sql-guid-primary Add a GUID-based primary key to automatically generated tables
--auto-generate-sql-load-type Specify the test load type
--auto-generate-sql-secondary-indexes Specify how many secondary indexes to add to automatically generated tables
--auto-generate-sql-unique-query-number How many different queries to generate for automatic tests
--auto-generate-sql-unique-write-number How many different queries to generate for --auto-generate-sql-write-number
--auto-generate-sql-write-number How many row inserts to perform on each thread
--commit How many statements to execute before committing
--compress Compress all information sent between client and server 8.0.18
--compression-algorithms Permitted compression algorithms for connections to server 8.0.18
--concurrency Number of clients to simulate when issuing the SELECT statement
--create File or string containing the statement to use for creating the table
--create-schema Schema in which to run the tests
--csv Generate output in comma-separated values format
--debug Write debugging log
--debug-check Print debugging information when program exits
--debug-info Print debugging information, memory, and CPU statistics when program exits
--default-auth Authentication plugin to use
--defaults-extra-file Read named option file in addition to usual option files
--defaults-file Read only named option file
--defaults-group-suffix Option group suffix value
--delimiter Delimiter to use in SQL statements
--detach Detach (close and reopen) each connection after each N statements
--enable-cleartext-plugin Enable cleartext authentication plugin
--engine Storage engine to use for creating the table
--get-server-public-key Request RSA public key from server
--help Display help message and exit
--host Host on which MySQL server is located
--iterations Number of times to run the tests
--login-path Read login path options from .mylogin.cnf
--no-defaults Read no option files
--no-drop Do not drop any schema created during the test run
--number-char-cols Number of VARCHAR columns to use if --auto-generate-sql is specified
--number-int-cols Number of INT columns to use if --auto-generate-sql is specified
--number-of-queries Limit each client to approximately this number of queries
--only-print Do not connect to databases. mysqlslap only prints what it would have done
--password Password to use when connecting to server
--pipe Connect to server using named pipe (Windows only)
--plugin-dir Directory where plugins are installed
--port TCP/IP port number for connection
--post-query File or string containing the statement to execute after the tests have completed
--post-system String to execute using system() after the tests have completed
--pre-query File or string containing the statement to execute before running the tests
--pre-system String to execute using system() before running the tests
--print-defaults Print default options
--protocol Transport protocol to use
--query File or string containing the SELECT statement to use for retrieving data
--server-public-key-path Path name to file containing RSA public key
--shared-memory-base-name Shared-memory name for shared-memory connections (Windows only)
--silent Silent mode
--socket Unix socket file or Windows named pipe to use
--sql-mode Set SQL mode for client session
--ssl-ca File that contains list of trusted SSL Certificate Authorities
--ssl-capath Directory that contains trusted SSL Certificate Authority certificate files
--ssl-cert File that contains X.509 certificate
--ssl-cipher Permissible ciphers for connection encryption
--ssl-crl File that contains certificate revocation lists
--ssl-crlpath Directory that contains certificate revocation-list files
--ssl-fips-mode Whether to enable FIPS mode on client side
--ssl-key File that contains X.509 key
--ssl-mode Desired security state of connection to server
--tls-ciphersuites Permissible TLSv1.3 ciphersuites for encrypted connections 8.0.16
--tls-version Permissible TLS protocols for encrypted connections
--user MySQL user name to use when connecting to server
--verbose Verbose mode
--version Display version information and exit
--zstd-compression-level Compression level for connections to server that use zstd compression 8.0.18