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4.3. Specifying Program Options

There are several ways to specify options for MySQL programs:

  • List the options on the command line following the program name. This is most common for options that apply to a specific invocation of the program.

  • List the options in an option file that the program reads when it starts. This is common for options that you want the program to use each time it runs.

  • List the options in environment variables. This method is useful for options that you want to apply each time the program runs. In practice, option files are used more commonly for this purpose. However, Section 5.12.2, “Running Multiple Servers on Unix”, discusses one situation in which environment variables can be very helpful. It describes a handy technique that uses such variables to specify the TCP/IP port number and Unix socket file for both the server and client programs.

To determine which options are given, MySQL programs first by examining environment variables, then by reading option files, and then by checking the command line. If an option is specified multiple times, the last occurrence takes precedence. This means that environment variables have the lowest precedence and command-line options the highest.

You can take advantage of the way that MySQL programs process options by specifying default values for a program's options in an option file. That enables you to avoid typing them each time you run the program, but also allows you to override the defaults if necessary by using command-line options.


 
 
  Published under the terms of the GNU General Public License Design by Interspire