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MySQL 5.7 Reference Manual  /  ...  /  mysqlslap — Load Emulation Client

4.5.9 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 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 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] groups of an option file. For information about option files used by MySQL programs, see Section 4.2.6, “Using Option Files”.

Table 4.18 mysqlslap Options

--auto-generate-sqlGenerate SQL statements automatically when they are not supplied in files or using command options  
--auto-generate-sql-add-autoincrementAdd AUTO_INCREMENT column to automatically generated tables  
--auto-generate-sql-execute-numberSpecify how many queries to generate automatically  
--auto-generate-sql-guid-primaryAdd a GUID-based primary key to automatically generated tables  
--auto-generate-sql-load-typeSpecify the test load type  
--auto-generate-sql-secondary-indexesSpecify how many secondary indexes to add to automatically generated tables  
--auto-generate-sql-unique-query-numberHow many different queries to generate for automatic tests.  
--auto-generate-sql-unique-write-numberHow many different queries to generate for --auto-generate-sql-write-number  
--auto-generate-sql-write-numberHow many row inserts to perform on each thread  
--commitHow many statements to execute before committing.  
--compressCompress all information sent between client and server  
--concurrencyNumber of clients to simulate when issuing the SELECT statement  
--createFile or string containing the statement to use for creating the table  
--create-schemaSchema in which to run the tests  
--csvGenerate output in comma-separated values format  
--debugWrite debugging log  
--debug-checkPrint debugging information when program exits  
--debug-infoPrint debugging information, memory, and CPU statistics when program exits  
--default-authAuthentication plugin to use  
--defaults-extra-fileRead named option file in addition to usual option files  
--defaults-fileRead only named option file  
--defaults-group-suffixOption group suffix value  
--delimiterDelimiter to use in SQL statements  
--detachDetach (close and reopen) each connection after each N statements  
--enable-cleartext-pluginEnable cleartext authentication plugin  
--engineStorage engine to use for creating the table  
--helpDisplay help message and exit  
--hostConnect to MySQL server on given host  
--iterationsNumber of times to run the tests  
--login-pathRead login path options from .mylogin.cnf  
--no-defaultsRead no option files  
--no-dropDo not drop any schema created during the test run  
--number-char-colsNumber of VARCHAR columns to use if --auto-generate-sql is specified  
--number-int-colsNumber of INT columns to use if --auto-generate-sql is specified  
--number-of-queriesLimit each client to approximately this number of queries  
--only-printDo not connect to databases. mysqlslap only prints what it would have done  
--passwordPassword to use when connecting to server  
--pipeOn Windows, connect to server using named pipe  
--plugin-dirDirectory where plugins are installed  
--portTCP/IP port number for connection  
--post-queryFile or string containing the statement to execute after the tests have completed  
--post-systemString to execute using system() after the tests have completed  
--pre-queryFile or string containing the statement to execute before running the tests  
--pre-systemString to execute using system() before running the tests  
--print-defaultsPrint default options  
--protocolConnection protocol to use  
--queryFile or string containing the SELECT statement to use for retrieving data  
--secure-authDo not send passwords to server in old (pre-4.1) format5.
--shared-memory-base-nameThe name of shared memory to use for shared-memory connections  
--silentSilent mode  
--socketFor connections to localhost, the Unix socket file to use  
--sql-modeSet SQL mode for client session5.7.5 
--sslEnable encrypted connection  
--ssl-caFile that contains list of trusted SSL Certificate Authorities  
--ssl-capathDirectory that contains trusted SSL Certificate Authority certificate files  
--ssl-certFile that contains X509 certificate  
--ssl-cipherList of permitted ciphers for connection encryption  
--ssl-crlFile that contains certificate revocation lists  
--ssl-crlpathDirectory that contains certificate revocation list files  
--ssl-keyFile that contains X509 key  
--ssl-modeSecurity state of connection to server5.7.11 
--ssl-verify-server-certVerify host name against server certificate Common Name identity  
--tls-versionProtocols permitted for encrypted connections5.7.10 
--userMySQL user name to use when connecting to server  
--verboseVerbose mode  
--versionDisplay version information and exit  

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