File delimiters separate data-source fields. Outside rules files, data-source fields are delimited by spaces. Within rules files, by default, data-source fields are delimited by tabs.
Within data load or dimension build rules files, you can set commas, tabs, white spaces, fixed-width columns, or custom values as file delimiters. You need not set file delimiters for SQL data.
To set file delimiters:
Select Options, then Data source properties.
In the Data Source Properties dialog box, select the Delimiter tab.
If you selected a custom file delimiter, in the text box, enter a character from the standard ASCII character set, from 0 to 127.
If you selected fixed-width columns, in the text box, enter the column width.