Has no effect on full-text catalogs in SQL Server 2008 and later versions and is supported for backward compatibility only. sp_fulltext_database does not disable the Full-Text Engine for a given database. All user-created databases in SQL Server 2012 are always enabled for full-text indexing.
This feature will be removed in a future version of Microsoft SQL Server. Do not use this feature in new development work, and modify applications that currently use this feature as soon as possible. Use Management Studio instead.
In SQL Server 2008 and later versions, full-text indexing cannot be turned off. Disabling full-text indexing does not remove rows from sysfulltextcatalogs and does not indicate that full-text enabled tables are no longer marked for full-text indexing. All the full-text metadata definitions are still in the system tables.