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MySQL 8.4 Reference Manual  /  ...  /  mysqlslap — A Load Emulation Client

6.5.7 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.

Examples:

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
  --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 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
  --delimiter=";"

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 6.2.2.2, “Using Option Files”.

Table 6.16 mysqlslap Options

Option Name Description
--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
--compression-algorithms Permitted compression algorithms for connections to server
--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
--no-login-paths Do not read login paths from the login path file
--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
--password1 First multifactor authentication password to use when connecting to server
--password2 Second multifactor authentication password to use when connecting to server
--password3 Third multifactor authentication 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
--ssl-session-data File that contains SSL session data
--ssl-session-data-continue-on-failed-reuse Whether to establish connections if session reuse fails
--tls-ciphersuites Permissible TLSv1.3 ciphersuites for encrypted connections
--tls-sni-servername Server name supplied by the client
--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

  • --help, -?

    Command-Line Format --help

    Display a help message and exit.

  • --auto-generate-sql, -a

    Command-Line Format --auto-generate-sql
    Type Boolean
    Default Value FALSE

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

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

    Command-Line Format --auto-generate-sql-add-autoincrement
    Type Boolean
    Default Value FALSE

    Add an AUTO_INCREMENT column to automatically generated tables.

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

    Command-Line Format --auto-generate-sql-execute-number=#
    Type Numeric

    Specify how many queries to generate automatically.

  • --auto-generate-sql-guid-primary

    Command-Line Format --auto-generate-sql-guid-primary
    Type Boolean
    Default Value FALSE

    Add a GUID-based primary key to automatically generated tables.

  • --auto-generate-sql-load-type=type

    Command-Line Format --auto-generate-sql-load-type=type
    Type Enumeration
    Default Value mixed
    Valid Values

    read

    write

    key

    update

    mixed

    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

    Command-Line Format --auto-generate-sql-secondary-indexes=#
    Type Numeric
    Default Value 0

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

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

    Command-Line Format --auto-generate-sql-unique-query-number=#
    Type Numeric
    Default Value 10

    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

    Command-Line Format --auto-generate-sql-unique-write-number=#
    Type Numeric
    Default Value 10

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

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

    Command-Line Format --auto-generate-sql-write-number=#
    Type Numeric
    Default Value 100

    How many row inserts to perform. The default is 100.

  • --commit=N

    Command-Line Format --commit=#
    Type Numeric
    Default Value 0

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

  • --compress, -C

    Command-Line Format --compress[={OFF|ON}]
    Deprecated Yes
    Type Boolean
    Default Value OFF

    Compress all information sent between the client and the server if possible. See Section 6.2.8, “Connection Compression Control”.

    This option is deprecated. Expect it to be removed in a future version of MySQL. See Configuring Legacy Connection Compression.

  • --compression-algorithms=value

    Command-Line Format --compression-algorithms=value
    Type Set
    Default Value uncompressed
    Valid Values

    zlib

    zstd

    uncompressed

    The permitted compression algorithms for connections to the server. The available algorithms are the same as for the protocol_compression_algorithms system variable. The default value is uncompressed.

    For more information, see Section 6.2.8, “Connection Compression Control”.

  • --concurrency=N, -c N

    Command-Line Format --concurrency=#
    Type Numeric

    The number of parallel clients to simulate.

  • --create=value

    Command-Line Format --create=value
    Type String

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

  • --create-schema=value

    Command-Line Format --create-schema=value
    Type String

    The schema in which to run the tests.

    Note

    If the --auto-generate-sql option is also given, mysqlslap drops the schema at the end of the test run. To avoid this, use the --no-drop option as well.

  • --csv[=file_name]

    Command-Line Format --csv=[file]
    Type 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]

    Command-Line Format --debug[=debug_options]
    Type String
    Default Value d:t:o,/tmp/mysqlslap.trace

    Write a debugging log. A typical debug_options string is d:t:o,file_name. The default is d:t:o,/tmp/mysqlslap.trace.

    This option is available only if MySQL was built using WITH_DEBUG. MySQL release binaries provided by Oracle are not built using this option.

  • --debug-check

    Command-Line Format --debug-check
    Type Boolean
    Default Value FALSE

    Print some debugging information when the program exits.

    This option is available only if MySQL was built using WITH_DEBUG. MySQL release binaries provided by Oracle are not built using this option.

  • --debug-info, -T

    Command-Line Format --debug-info
    Type Boolean
    Default Value FALSE

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

    This option is available only if MySQL was built using WITH_DEBUG. MySQL release binaries provided by Oracle are not built using this option.

  • --default-auth=plugin

    Command-Line Format --default-auth=plugin
    Type String

    A hint about which client-side authentication plugin to use. See Section 8.2.17, “Pluggable Authentication”.

  • --defaults-extra-file=file_name

    Command-Line Format --defaults-extra-file=file_name
    Type File name

    Read this option file after the global option file but (on Unix) before the user option file. If the file does not exist or is otherwise inaccessible, an error occurs. If file_name is not an absolute path name, it is interpreted relative to the current directory.

    For additional information about this and other option-file options, see Section 6.2.2.3, “Command-Line Options that Affect Option-File Handling”.

  • --defaults-file=file_name

    Command-Line Format --defaults-file=file_name
    Type File name

    Use only the given option file. If the file does not exist or is otherwise inaccessible, an error occurs. If file_name is not an absolute path name, it is interpreted relative to the current directory.

    Exception: Even with --defaults-file, client programs read .mylogin.cnf.

    For additional information about this and other option-file options, see Section 6.2.2.3, “Command-Line Options that Affect Option-File Handling”.

  • --defaults-group-suffix=str

    Command-Line Format --defaults-group-suffix=str
    Type String

    Read not only the usual option groups, but also groups with the usual names and a suffix of str. For example, mysqlslap normally reads the [client] and [mysqlslap] groups. If this option is given as --defaults-group-suffix=_other, mysqlslap also reads the [client_other] and [mysqlslap_other] groups.

    For additional information about this and other option-file options, see Section 6.2.2.3, “Command-Line Options that Affect Option-File Handling”.

  • --delimiter=str, -F str

    Command-Line Format --delimiter=str
    Type String

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

  • --detach=N

    Command-Line Format --detach=#
    Type Numeric
    Default Value 0

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

  • --enable-cleartext-plugin

    Command-Line Format --enable-cleartext-plugin
    Type Boolean
    Default Value FALSE

    Enable the mysql_clear_password cleartext authentication plugin. (See Section 8.4.1.4, “Client-Side Cleartext Pluggable Authentication”.)

  • --engine=engine_name, -e engine_name

    Command-Line Format --engine=engine_name
    Type String

    The storage engine to use for creating tables.

  • --get-server-public-key

    Command-Line Format --get-server-public-key
    Type Boolean

    Request from the server the RSA public key that it uses for key pair-based password exchange. This option applies to clients that connect to the server using an account that authenticates with the caching_sha2_password authentication plugin. For connections by such accounts, the server does not send the public key to the client unless requested. The option is ignored for accounts that do not authenticate with that plugin. It is also ignored if RSA-based password exchange is not needed, as is the case when the client connects to the server using a secure connection.

    If --server-public-key-path=file_name is given and specifies a valid public key file, it takes precedence over --get-server-public-key.

    For information about the caching_sha2_password plugin, see Section 8.4.1.2, “Caching SHA-2 Pluggable Authentication”.

  • --host=host_name, -h host_name

    Command-Line Format --host=host_name
    Type String
    Default Value localhost

    Connect to the MySQL server on the given host.

  • --iterations=N, -i N

    Command-Line Format --iterations=#
    Type Numeric

    The number of times to run the tests.

  • --login-path=name

    Command-Line Format --login-path=name
    Type String

    Read options from the named login path in the .mylogin.cnf login path file. A login path is an option group containing options that specify which MySQL server to connect to and which account to authenticate as. To create or modify a login path file, use the mysql_config_editor utility. See Section 6.6.7, “mysql_config_editor — MySQL Configuration Utility”.

    For additional information about this and other option-file options, see Section 6.2.2.3, “Command-Line Options that Affect Option-File Handling”.

  • --no-login-paths

    Command-Line Format --no-login-paths

    Skips reading options from the login path file.

    See --login-path for related information.

    For additional information about this and other option-file options, see Section 6.2.2.3, “Command-Line Options that Affect Option-File Handling”.

  • --no-drop

    Command-Line Format --no-drop
    Type Boolean
    Default Value FALSE

    Prevent mysqlslap from dropping any schema it creates during the test run.

  • --no-defaults

    Command-Line Format --no-defaults

    Do not read any option files. If program startup fails due to reading unknown options from an option file, --no-defaults can be used to prevent them from being read.

    The exception is that the .mylogin.cnf file is read in all cases, if it exists. This permits passwords to be specified in a safer way than on the command line even when --no-defaults is used. To create .mylogin.cnf, use the mysql_config_editor utility. See Section 6.6.7, “mysql_config_editor — MySQL Configuration Utility”.

    For additional information about this and other option-file options, see Section 6.2.2.3, “Command-Line Options that Affect Option-File Handling”.

  • --number-char-cols=N, -x N

    Command-Line Format --number-char-cols=#
    Type Numeric

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

  • --number-int-cols=N, -y N

    Command-Line Format --number-int-cols=#
    Type Numeric

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

  • --number-of-queries=N

    Command-Line Format --number-of-queries=#
    Type Numeric

    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.

    mysqlslap --delimiter=";" --number-of-queries=10
              --query="use test;insert into t values(null)"
  • --only-print

    Command-Line Format --only-print
    Type Boolean
    Default Value FALSE

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

  • --password[=password], -p[password]

    Command-Line Format --password[=password]
    Type String

    The password of the MySQL account used for connecting to the server. The password value is optional. If not given, mysqlslap prompts for one. If given, there must be no space between --password= or -p and the password following it. If no password option is specified, the default is to send no password.

    Specifying a password on the command line should be considered insecure. To avoid giving the password on the command line, use an option file. See Section 8.1.2.1, “End-User Guidelines for Password Security”.

    To explicitly specify that there is no password and that mysqlslap should not prompt for one, use the --skip-password option.

  • --password1[=pass_val]

    The password for multifactor authentication factor 1 of the MySQL account used for connecting to the server. The password value is optional. If not given, mysqlslap prompts for one. If given, there must be no space between --password1= and the password following it. If no password option is specified, the default is to send no password.

    Specifying a password on the command line should be considered insecure. To avoid giving the password on the command line, use an option file. See Section 8.1.2.1, “End-User Guidelines for Password Security”.

    To explicitly specify that there is no password and that mysqlslap should not prompt for one, use the --skip-password1 option.

    --password1 and --password are synonymous, as are --skip-password1 and --skip-password.

  • --password2[=pass_val]

    The password for multifactor authentication factor 2 of the MySQL account used for connecting to the server. The semantics of this option are similar to the semantics for --password1; see the description of that option for details.

  • --password3[=pass_val]

    The password for multifactor authentication factor 3 of the MySQL account used for connecting to the server. The semantics of this option are similar to the semantics for --password1; see the description of that option for details.

  • --pipe, -W

    Command-Line Format --pipe
    Type String

    On Windows, connect to the server using a named pipe. This option applies only if the server was started with the named_pipe system variable enabled to support named-pipe connections. In addition, the user making the connection must be a member of the Windows group specified by the named_pipe_full_access_group system variable.

  • --plugin-dir=dir_name

    Command-Line Format --plugin-dir=dir_name
    Type Directory name

    The directory in which to look for plugins. Specify this option if the --default-auth option is used to specify an authentication plugin but mysqlslap does not find it. See Section 8.2.17, “Pluggable Authentication”.

  • --port=port_num, -P port_num

    Command-Line Format --port=port_num
    Type Numeric
    Default Value 3306

    For TCP/IP connections, the port number to use.

  • --post-query=value

    Command-Line Format --post-query=value
    Type String

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

  • --post-system=str

    Command-Line Format --post-system=str
    Type String

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

  • --pre-query=value

    Command-Line Format --pre-query=value
    Type String

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

  • --pre-system=str

    Command-Line Format --pre-system=str
    Type String

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

  • --print-defaults

    Command-Line Format --print-defaults

    Print the program name and all options that it gets from option files.

    For additional information about this and other option-file options, see Section 6.2.2.3, “Command-Line Options that Affect Option-File Handling”.

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

    Command-Line Format --protocol=type
    Type String
    Default Value [see text]
    Valid Values

    TCP

    SOCKET

    PIPE

    MEMORY

    The transport protocol to use for connecting to the server. It is useful when the other connection parameters normally result in use of a protocol other than the one you want. For details on the permissible values, see Section 6.2.7, “Connection Transport Protocols”.

  • --query=value, -q value

    Command-Line Format --query=value
    Type String

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

  • --server-public-key-path=file_name

    Command-Line Format --server-public-key-path=file_name
    Type File name

    The path name to a file in PEM format containing a client-side copy of the public key required by the server for RSA key pair-based password exchange. This option applies to clients that authenticate with the sha256_password (deprecated) or caching_sha2_password authentication plugin. This option is ignored for accounts that do not authenticate with one of those plugins. It is also ignored if RSA-based password exchange is not used, as is the case when the client connects to the server using a secure connection.

    If --server-public-key-path=file_name is given and specifies a valid public key file, it takes precedence over --get-server-public-key.

    For sha256_password (deprecated), this option applies only if MySQL was built using OpenSSL.

    For information about the sha256_password and caching_sha2_password plugins, see Section 8.4.1.3, “SHA-256 Pluggable Authentication”, and Section 8.4.1.2, “Caching SHA-2 Pluggable Authentication”.

  • --shared-memory-base-name=name

    Command-Line Format --shared-memory-base-name=name
    Platform Specific Windows

    On Windows, the shared-memory name to use for connections made using shared memory to a local server. The default value is MYSQL. The shared-memory name is case-sensitive.

    This option applies only if the server was started with the shared_memory system variable enabled to support shared-memory connections.

  • --silent, -s

    Command-Line Format --silent

    Silent mode. No output.

  • --socket=path, -S path

    Command-Line Format --socket={file_name|pipe_name}
    Type String

    For connections to localhost, the Unix socket file to use, or, on Windows, the name of the named pipe to use.

    On Windows, this option applies only if the server was started with the named_pipe system variable enabled to support named-pipe connections. In addition, the user making the connection must be a member of the Windows group specified by the named_pipe_full_access_group system variable.

  • --sql-mode=mode

    Command-Line Format --sql-mode=mode
    Type String

    Set the SQL mode for the client session.

  • --ssl*

    Options that begin with --ssl specify whether to connect to the server using encryption and indicate where to find SSL keys and certificates. See Command Options for Encrypted Connections.

  • --ssl-fips-mode={OFF|ON|STRICT}

    Command-Line Format --ssl-fips-mode={OFF|ON|STRICT}
    Deprecated Yes
    Type Enumeration
    Default Value OFF
    Valid Values

    OFF

    ON

    STRICT

    Controls whether to enable FIPS mode on the client side. The --ssl-fips-mode option differs from other --ssl-xxx options in that it is not used to establish encrypted connections, but rather to affect which cryptographic operations to permit. See Section 8.8, “FIPS Support”.

    These --ssl-fips-mode values are permitted:

    • OFF: Disable FIPS mode.

    • ON: Enable FIPS mode.

    • STRICT: Enable strict FIPS mode.

    Note

    If the OpenSSL FIPS Object Module is not available, the only permitted value for --ssl-fips-mode is OFF. In this case, setting --ssl-fips-mode to ON or STRICT causes the client to produce a warning at startup and to operate in non-FIPS mode.

    This option is deprecated. Expect it to be removed in a future version of MySQL.

  • --tls-ciphersuites=ciphersuite_list

    Command-Line Format --tls-ciphersuites=ciphersuite_list
    Type String

    The permissible ciphersuites for encrypted connections that use TLSv1.3. The value is a list of one or more colon-separated ciphersuite names. The ciphersuites that can be named for this option depend on the SSL library used to compile MySQL. For details, see Section 8.3.2, “Encrypted Connection TLS Protocols and Ciphers”.

  • --tls-sni-servername=server_name

    Command-Line Format --tls-sni-servername=server_name
    Type String

    When specified, the name is passed to the libmysqlclient C API library using the MYSQL_OPT_TLS_SNI_SERVERNAME option of mysql_options(). The server name is not case-sensitive. To show which server name the client specified for the current session, if any, check the Tls_sni_server_name status variable.

    Server Name Indication (SNI) is an extension to the TLS protocol (OpenSSL must be compiled using TLS extensions for this option to function). The MySQL implementation of SNI represents the client-side only.

  • --tls-version=protocol_list

    Command-Line Format --tls-version=protocol_list
    Type String
    Default Value

    TLSv1,TLSv1.1,TLSv1.2,TLSv1.3 (OpenSSL 1.1.1 or higher)

    TLSv1,TLSv1.1,TLSv1.2 (otherwise)

    The permissible TLS protocols for encrypted connections. The value is a list of one or more comma-separated protocol names. The protocols that can be named for this option depend on the SSL library used to compile MySQL. For details, see Section 8.3.2, “Encrypted Connection TLS Protocols and Ciphers”.

  • --user=user_name, -u user_name

    Command-Line Format --user=user_name,
    Type String

    The user name of the MySQL account to use for connecting to the server.

  • --verbose, -v

    Command-Line Format --verbose

    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

    Command-Line Format --version

    Display version information and exit.

  • --zstd-compression-level=level

    Command-Line Format --zstd-compression-level=#
    Type Integer

    The compression level to use for connections to the server that use the zstd compression algorithm. The permitted levels are from 1 to 22, with larger values indicating increasing levels of compression. The default zstd compression level is 3. The compression level setting has no effect on connections that do not use zstd compression.

    For more information, see Section 6.2.8, “Connection Compression Control”.