This section lists environment variables that are used directly or indirectly by MySQL. Most of these can also be found in other places in this manual.
Options on the command line take precedence over values specified in option files and environment variables, and values in option files take precedence over values in environment variables. In many cases, it is preferable to use an option file instead of environment variables to modify the behavior of MySQL. See *note option-files::.
Variable Description
'AUTHENTICATION_LDAP_CLIENT_LOG'Client-side LDAP authentication logging level.
'AUTHENTICATION_PAM_LOG' PAM authentication plugin debug logging settings.
'CC' The name of your C compiler (for running 'CMake').
'CXX' The name of your C++ compiler (for running 'CMake').
'CC' The name of your C compiler (for running 'CMake').
'DBI_USER' The default user name for Perl DBI.
'DBI_TRACE' Trace options for Perl DBI.
'HOME' The default path for the *note 'mysql': mysql. history file is '$HOME/.mysql_history'.
'LD_RUN_PATH' Used to specify the location of 'libmysqlclient.so'.
'LIBMYSQL_ENABLE_CLEARTEXT_PLUGIN'Enable 'mysql_clear_password' authentication plugin; see *note cleartext-pluggable-authentication::.
'LIBMYSQL_PLUGIN_DIR' Directory in which to look for client plugins.
'LIBMYSQL_PLUGINS' Client plugins to preload.
'MYSQL_DEBUG' Debug trace options when debugging.
'MYSQL_GROUP_SUFFIX' Option group suffix value (like specifying '--defaults-group-suffix').
'MYSQL_HISTFILE' The path to the *note 'mysql': mysql. history file. If this variable is set, its value overrides the default for '$HOME/.mysql_history'.
'MYSQL_HISTIGNORE' Patterns specifying statements that *note 'mysql': mysql. should not log to '$HOME/.mysql_history', or 'syslog' if '--syslog' is given.
'MYSQL_HOME' The path to the directory in which the server-specific 'my.cnf' file resides.
'MYSQL_HOST' The default host name used by the *note 'mysql': mysql. command-line client.
'MYSQL_OPENSSL_UDF_DH_BITS_THRESHOLD'Maximum key length for 'create_dh_parameters()'. See *note enterprise-encryption-usage::.
'MYSQL_OPENSSL_UDF_DSA_BITS_THRESHOLD'Maximum DSA key length for 'create_asymmetric_priv_key()'. See *note enterprise-encryption-usage::.
'MYSQL_OPENSSL_UDF_RSA_BITS_THRESHOLD'Maximum RSA key length for 'create_asymmetric_priv_key()'. See *note enterprise-encryption-usage::.
'MYSQL_PS1' The command prompt to use in the *note 'mysql': mysql. command-line client.
'MYSQL_PWD' The default password when connecting to note 'mysqld': mysqld. Using this is insecure. See note password-security-user::.
'MYSQL_TCP_PORT' The default TCP/IP port number.
'MYSQL_TEST_LOGIN_FILE' The name of the '.mylogin.cnf' login path file.
'MYSQL_TEST_TRACE_CRASH' Whether the test protocol trace plugin crashes clients. See note following table.
'MYSQL_TEST_TRACE_DEBUG' Whether the test protocol trace plugin produces output. See note following table.
'MYSQL_UNIX_PORT' The default Unix socket file name; used for connections to 'localhost'.
'MYSQLX_TCP_PORT' The X Plugin default TCP/IP port number.
'MYSQLX_UNIX_PORT' The X Plugin default Unix socket file name; used for connections to 'localhost'.
'PATH' Used by the shell to find MySQL programs.
'PKG_CONFIG_PATH' Location of 'mysqlclient.pc' 'pkg-config' file. See note following table.
'TMPDIR' The directory in which temporary files are created.
'TZ' This should be set to your local time zone. See *note timezone-problems::.
'UMASK' The user-file creation mode when creating files. See note following table.
'UMASK_DIR' The user-directory creation mode when creating directories. See note following table.
'USER' The default user name on Windows when connecting to *note 'mysqld': mysqld.
For information about the note 'mysql': mysql. history file, see note mysql-logging::.
'MYSQL_TEST_LOGIN_FILE' is the path name of the login path file (the file created by note 'mysql_config_editor': mysql-config-editor.). If not set, the default value is '%APPDATA%.mylogin.cnf' directory on Windows and '$HOME/.mylogin.cnf' on non-Windows systems. See note mysql-config-editor::.
The 'MYSQL_TEST_TRACE_DEBUG' and 'MYSQL_TEST_TRACE_CRASH' variables control the test protocol trace client plugin, if MySQL is built with that plugin enabled. For more information, see Using the Test Protocol Trace Plugin (https://dev.mysql.com/doc/extending-mysql/5.7/en/test-protocol-trace-plugin.html).
The default 'UMASK' and 'UMASK_DIR' values are '0640' and '0750', respectively. MySQL assumes that the value for 'UMASK' or 'UMASK_DIR' is in octal if it starts with a zero. For example, setting 'UMASK=0600' is equivalent to 'UMASK=384' because 0600 octal is 384 decimal.
The 'UMASK' and 'UMASK_DIR' variables, despite their names, are used as modes, not masks:
If 'UMASK' is set, *note 'mysqld': mysqld. uses '($UMASK | 0600)' as the mode for file creation, so that newly created files have a mode in the range from 0600 to 0666 (all values octal).
If 'UMASK_DIR' is set, *note 'mysqld': mysqld. uses '(UMASKDIR|0700)′asthebasemodefordirectorycreation, whichthenisAND − edwith′ ( UMASK & 0666)', so that newly created directories have a mode in the range from 0700 to 0777 (all values octal). The AND operation may remove read and write permissions from the directory mode, but not execute permissions.
See also *note file-permissions::.
It may be necessary to set 'PKG_CONFIG_PATH' if you use 'pkg-config' for building MySQL programs. See Building C API Client Programs Using pkg-config (https://dev.mysql.com/doc/c-api/5.7/en/c-api-building-clients-pkg-config.html).
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