4.5.7. 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.

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 connection.

Examples:

Supply your own create and query SQL statements, with 50 clients querying and 200 selects for each:

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 \
  --auto-generate-sql

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 \
  --delimiter=";"

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 4.2.3.3.1, “Command-Line Options that Affect Option-File Handling”.

Table 4.8. mysqlslap Options

FormatOption FileDescriptionIntroductionDeprecatedRemoved
--auto-generate-sqlauto-generate-sqlGenerate SQL statements automatically when they are not supplied in files or using command options   
--auto-generate-sql-add-autoincrementauto-generate-sql-add-autoincrementAdd AUTO_INCREMENT column to automatically generated tables   
--auto-generate-sql-execute-number=#auto-generate-sql-execute-numberSpecify how many queries to generate automatically   
--auto-generate-sql-guid-primaryauto-generate-sql-guid-primaryAdd a GUID-based primary key to automatically generated tables   
--auto-generate-sql-load-type=typeauto-generate-sql-load-typeSpecify how many queries to generate automatically   
--auto-generate-sql-secondary-indexes=#auto-generate-sql-secondary-indexesSpecify how many secondary indexes to add to automatically generated tables   
--auto-generate-sql-unique-query-number=#auto-generate-sql-unique-query-numberHow many different queries to generate for automatic tests.   
--auto-generate-sql-unique-write-number=#auto-generate-sql-unique-write-numberHow many different queries to generate for --auto-generate-sql-write-number   
--auto-generate-sql-write-number=#auto-generate-sql-write-numberHow many row inserts to perform on each thread   
--commit=#commitHow many statements to execute before committing.   
--compresscompressCompress all information sent between the client and the server   
--concurrency=#concurrencyThe number of clients to simulate when issuing the SELECT statement   
--create=valuecreateThe file or string containing the statement to use for creating the table   
--create-schema=valuecreate-schemaThe schema in which to run the tests   
--csv=[file]csvGenerate output in comma-separated values format   
--debug[=debug_options]debugWrite a debugging log   
--debug-checkdebug-checkPrint debugging information when the program exits   
--debug-infodebug-infoPrint debugging information, memory and CPU statistics when the program exits   
--delimiter=strdelimiterThe delimiter to use in SQL statements   
--detach=#detachDetach (close and reopen) each connection after each N statements   
--engine=engine_nameengineThe storage engine to use for creating the table   
--help Display help message and exit   
--host=host_namehostConnect to the MySQL server on the given host   
--iterations=#iterationsThe number of times to run the tests   
--number-char-cols=#number-char-colsThe number of VARCHAR columns to use if --auto-generate-sql is specified   
--number-int-cols=#number-int-colsThe number of INT columns to use if --auto-generate-sql is specified   
--number-of-queries=#number-of-queriesLimit each client to approximately this number of queries   
--only-printonly-printDo not connect to databases. mysqlslap only prints what it would have done   
--password[=password]passwordThe password to use when connecting to the server   
--pipe On Windows, connect to server using a named pipe   
--port=port_numportThe TCP/IP port number to use for the connection   
--post-query=valuepost-queryThe file or string containing the statement to execute after the tests have completed   
--post-system=strpost-systemThe string to execute using system() after the tests have completed   
--pre-query=valuepre-queryThe file or string containing the statement to execute before running the tests   
--pre-system=strpre-systemThe string to execute using system() before running the tests   
--protocol=typeprotocolThe connection protocol to use   
--query=valuequeryThe file or string containg the SELECT statement to use for retrieving data   
--silentsilentSilent mode   
--socket=pathsocketFor connections to localhost   
--ssl-ca=file_namessl-caThe path to a file that contains a list of trusted SSL CAs   
--ssl-capath=directory_namessl-capathThe path to a directory that contains trusted SSL CA certificates in PEM format   
--ssl-cert=file_namessl-certThe name of the SSL certificate file to use for establishing a secure connection   
--ssl-cipher=cipher_listssl-cipherA list of allowable ciphers to use for SSL encryption   
--ssl-key=file_namessl-keyThe name of the SSL key file to use for establishing a secure connection   
--ssl-verify-server-certssl-verify-server-certThe server's Common Name value in its certificate is verified against the host name used when connecting to the server   
--user=user_name,userThe MySQL user name to use when connecting to the server   
--verbose Verbose mode   
--version Display version information and exit   
  • --help, -?

    Display a help message and exit.

  • --auto-generate-sql, -a

    Generate SQL statements automatically when they are not supplied in files or using command options.

  • --auto-generate-sql-add-autoincrement

    Add an AUTO_INCREMENT column to automatically generated tables.

  • --auto-generate-sql-execute-number=N

    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=type

    Specify the test load type. The permissible 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.

  • --auto-generate-sql-secondary-indexes=N

    Specify how many secondary indexes to add to automatically generated tables. By default, none are added.

  • --auto-generate-sql-unique-query-number=N

    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.

  • --auto-generate-sql-unique-write-number=N

    How many different queries to generate for --auto-generate-sql-write-number. The default is 10.

  • --auto-generate-sql-write-number=N

    How many row inserts to perform on each thread. The default is 100.

  • --commit=N

    How many statements to execute before committing. The default is 0 (no commits are done).

  • --compress, -C

    Compress all information sent between the client and the server if both support compression.

  • --concurrency=N, -c N

    The number of clients to simulate when issuing the SELECT statement.

  • --create=value

    The file or string containing the statement to use for creating the table.

  • --create-schema=value

    The schema in which to run the tests.

  • --csv[=file_name]

    Generate output in comma-separated values format. The output goes to the named file, or to the standard output if no file is given.

  • --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'.

  • --debug-check

    Print some debugging information when the program exits.

  • --debug-info, -T

    Print debugging information and memory and CPU usage statistics when the program exits.

  • --delimiter=str, -F str

    The delimiter to use in SQL statements supplied in files or using command options.

  • --detach=N

    Detach (close and reopen) each connection after each N statements. The default is 0 (connections are not detached).

  • --engine=engine_name, -e engine_name

    The storage engine to use for creating tables.

  • --host=host_name, -h host_name

    Connect to the MySQL server on the given host.

  • --iterations=N, -i N

    The number of times to run the tests.

  • --number-char-cols=N, -x N

    The number of VARCHAR columns to use if --auto-generate-sql is specified.

  • --number-int-cols=N, -y N

    The number of INT columns to use if --auto-generate-sql is specified.

  • --number-of-queries=N

    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)"
    
  • --only-print

    Do not connect to databases. mysqlslap only prints what it would have done.

  • --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 5.3.2.2, “End-User Guidelines for Password Security”. You can use an option file to avoid giving the password on the command line.

  • --pipe, -W

    On Windows, connect to the server using a named pipe. This option applies only if the server supports named-pipe connections.

  • --port=port_num, -P port_num

    The TCP/IP port number to use for the connection.

  • --post-query=value

    The file or string containing the statement to execute after the tests have completed. This execution is not counted for timing purposes.

  • --shared-memory-base-name=name

    On Windows, the shared-memory name to use, for connections made using shared memory to a local server. This option applies only if the server supports shared-memory connections.

  • --post-system=str

    The string to execute using system() after the tests have completed. This execution is not counted for timing purposes.

  • --pre-query=value

    The file or string containing the statement to execute before running the tests. This execution is not counted for timing purposes.

  • --pre-system=str

    The string to execute using system() before running the tests. This execution is not counted for timing purposes.

  • --protocol={TCP|SOCKET|PIPE|MEMORY}

    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 permissible values, see Section 4.2.2, “Connecting to the MySQL Server”.

  • --query=value, -q value

    The file or string containing the SELECT statement to use for retrieving data.

  • --silent, -s

    Silent mode. No output.

  • --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.

  • --ssl*

    Options that begin with --ssl specify whether to connect to the server using SSL and indicate where to find SSL keys and certificates. See Section 5.5.8.3, “SSL Command Options”.

  • --user=user_name, -u user_name

    The MySQL user name to use when connecting to the server.

  • --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.

  • --version, -V

    Display version information and exit.

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