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F Environment Variables

Here is a list of all the environment variables that are used directly or indirectly by MySQL. Most of these can also be found in other places in this manual.

Note that any options on the command-line will take precedence over values specified in configuration files and environment variables, and values in configuration files take precedence over values in environment variables.

In many cases it's preferable to use a configure file instead of environment variables to modify the behaviour of MySQL. See section 4.1.2 `my.cnf' Option Files.

Variable Description
CCX Set this to your C++ compiler when running configure.
CC Set this to your C compiler when running configure.
CFLAGS Flags for your C compiler when running configure.
CXXFLAGS Flags for your C++ compiler when running configure.
DBI_USER The default user name for Perl DBI.
DBI_TRACE Used when tracing Perl DBI.
HOME The default path for the mysql history file is `$HOME/.mysql_history'.
LD_RUN_PATH Used to specify where your `libmysqlclient.so' is.
MYSQL_DEBUG Debug-trace options when debugging.
MYSQL_HISTFILE The path to the mysql history file.
MYSQL_HOST Default host name used by the mysql command-line client.
MYSQL_PS1 Command prompt to use in the mysql command-line client. See section 4.8.2 mysql, The Command-line Tool.
MYSQL_PWD The default password when connecting to mysqld. Note that use of this is insecure!
MYSQL_TCP_PORT The default TCP/IP port.
MYSQL_UNIX_PORT The default socket; used for connections to localhost.
PATH Used by the shell to finds the MySQL programs.
TMPDIR The directory where temporary tables/files are created.
TZ This should be set to your local time zone. See section A.4.6 Time Zone Problems.
UMASK_DIR The user-directory creation mask when creating directories. Note that this is ANDed with UMASK!
UMASK The user-file creation mask when creating files.
USER The default user on Windows to use when connecting to mysqld.

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