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E Environment Variables

This appendix lists 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 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's preferable to use an option file instead of environment variables to modify the behavior of MySQL. See section 4.3.2 Using Option Files.

Variable Description
CXX The name of your C++ compiler (for running configure).
CC The name of your C compiler (for running configure).
CFLAGS Flags for your C compiler (for running configure).
CXXFLAGS Flags for your C++ compiler (for running configure).
DBI_USER The default username for Perl DBI.
DBI_TRACE Trace options for Perl DBI.
HOME The default path for the mysql history file is `$HOME/.mysql_history'.
LD_RUN_PATH Used to specify where your `libmysqlclient.so' is located.
MYSQL_DEBUG Debug trace options when debugging.
MYSQL_HISTFILE The path to the mysql history file. If this variable is set, its value overrides the default of `$HOME/.mysql_history'.
MYSQL_HOST The default hostname used by the mysql command-line client.
MYSQL_PS1 The command prompt to use in the mysql command-line client.
MYSQL_PWD The default password when connecting to mysqld. Note that use of this is insecure! See section 5.6.6 Keeping Your Password Secure.
MYSQL_TCP_PORT The default TCP/IP port number.
MYSQL_UNIX_PORT The default Unix socket filename; used for connections to localhost.
PATH Used by the shell to find MySQL programs.
TMPDIR The directory where temporary 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 username on Windows and NetWare to use when connecting to mysqld.

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