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If you need to specify startup options when you run the server, you can indicate them on the command line or place them in an option file. For options that are used every time the server starts, you may find it most convenient to use an option file to specify your MySQL configuration. This is particularly true under the following circumstances:

When the MySQL server starts on Windows, it looks for option files in several locations, such as the Windows directory,C:\, and the MySQL installation directory (for the full list of locations, seeSection 6.2.2.2, “Using Option Files”). The Windows directory typically is named something likeC:\WINDOWS. You can determine its exact location from the value of theWINDIR environment variable using the following command:

C:\> echo %WINDIR%

MySQL looks for options in each location first in themy.ini file, and then in themy.cnf file. However, to avoid confusion, it is best if you use only one file. If your PC uses a boot loader whereC: is not the boot drive, your only option is to use themy.ini file. Whichever option file you use, it must be a plain text file.

You can also make use of the example option files included with your MySQL distribution; seeSection 7.1.2, “Server Configuration Defaults”.

An option file can be created and modified with any text editor, such as Notepad. For example, if MySQL is installed inE:\mysql and the data directory is inE:\mydata\data, you can create an option file containing a[mysqld] section to specify values for thebasedir anddatadir options:

[mysqld]# set basedir to your installation pathbasedir=E:/mysql# set datadir to the location of your data directorydatadir=E:/mydata/data

Microsoft Windows path names are specified in option files using (forward) slashes rather than backslashes. If you do use backslashes, double them:

[mysqld]# set basedir to your installation pathbasedir=E:\\mysql# set datadir to the location of your data directorydatadir=E:\\mydata\\data

The rules for use of backslash in option file values are given inSection 6.2.2.2, “Using Option Files”.

The ZIP archive does not include adata directory. To initialize a MySQL installation by creating the data directory and populating the tables in the mysql system database, initialize MySQL using either--initialize or--initialize-insecure. For additional information, seeSection 2.9.1, “Initializing the Data Directory”.

If you would like to use a data directory in a different location, you should copy the entire contents of thedata directory to the new location. For example, if you want to useE:\mydata as the data directory instead, you must do two things: