In the default search administration mode, two content indexes are used for portal and non-portal content. You cannot delete these indexes. All site directory content and new content sources are crawled and included in the non-portal content index.

Advanced search administration mode enables you to create and manage additional indexes. A list of indexes is useful for large scale crawling and custom query scoping, but maintaining it is complex. After you configure a portal site for advanced search administration mode, you cannot return to the standard (default) mode.

Advanced search administration also enables you to do the following:

• Create multiple Site Directory content sources. This allows you to have multiple scopes over sites in the Site Directory.
• Organize content sources into source groups. This allows an installation with a long list of content sources to deal with them in groups. Source groups show in user interface for scope definition. Scopes are defined based on source groups and not individual sources. This results in improved performance for queries over these sets, since the query checks for a source group instead of using multiple checks for each content source.

If you enable advanced search administration mode, you can do the following additional tasks that are not available in the default search administration mode:

• Create an index
• Reset an index
• Delete an index
• Specify the index in which a content source is included
• Manage indexes

Enable advanced search administration mode

1. On the Site Settings page, in the Search Settings and Indexed Content section, click Configure search and indexing.
2. On the Configure Search and Indexing page, in the General Content Settings and Indexing Status section, click Enable advanced search administration mode.
3. On the Enable Advanced Search Administration Mode page, click OK.

After you have enabled advanced search administration mode, an additional section called Content Indexes appears on the Configure Search and Indexing page.