A fulltext index uses internal tables called full-text index fragments to store the inverted index data. This view can be used to query the metadata about these fragments. This view contains a row for each full-text index fragment in every table that contains a full-text index.
|Column name||Data type||Description|
|table_id||int||Object ID of the table that contains the full-text index fragment.|
|fragment_object_id||int||Object ID of the internal table associated with the fragment.|
|fragment_id||int||Logical ID of the full-text index fragment. This is unique across all fragments for this table.|
|timestamp||timestamp||Timestamp associated with the fragment creation. The timestamps of more recent fragments are larger than the timestamps of older fragments.|
|data_size||int||Logical size of the fragment in bytes.|
|row_count||int||Number of individual rows in the fragment.|
|status||int||Status of the fragment, one of:
0 = Newly created and not yet used
1 = Being used for insert during fulltext index population or merge
4 = Closed. Ready for query
6 = Being used for merge input and ready for query
8 = Marked for deletion. Will not be used for query and merge source.
A status of 4 or 6 means that the fragment is part of the logical full-text index and can be queried; that is, it is a queryable fragment.
The sys.fulltext_index_fragments catalog view can be used to query the number of fragments comprising a full-text index. If you are experiencing slow full-text query performance, you can use sys.fulltext_index_fragments to query for the number of queryable fragments (status = 4 or 6) in the full-text index, as follows:
SELECT table_id, status FROM sys.fulltext_index_fragments WHERE status=4 OR status=6;
If many queryable fragments exist, Microsoft recommends that you reorganize the full-text catalog that contains the full-text index to merge the fragments together. To reorganize a of full-text catalog use ALTER FULLTEXT CATALOGcatalog_name REORGANIZE. For example, to reorganize a full-text catalog named
ftCatalog in the
AdventureWorks2012 database, enter:
USE AdventureWorks2012; GO ALTER FULLTEXT CATALOG ftCatalog REORGANIZE; GO
The visibility of the metadata in catalog views is limited to securables that a user either owns or on which the user has been granted some permission.
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