What is the full-text search engine?
Full-Text Search is a component of Microsoft SQL Server. It allows you to issue full-text queries against character data in SQL Server tables.
In database servers, the Full-Text Search component is necessary to create a full-text catalog and index on XML columns in the geodatabase. Without this component, the XML columns in the geodatabase would not be indexed, and finding specific information in these columns would be unreasonably slow.
When installing SQL Server Express Edition with Advanced Services, you must install Full-Text Search. Other editions of SQL Server Express do not include support for full-text searching.
If you install the SQL Server Express instance provided with ArcGIS Server 9.3 Workgroup or later releases, the Advanced Services version of SQL Server Express is provided, and Full-Text Search is set to install by default.