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sys.fulltext_index_fragments (Transact-SQL)

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 CATALOG catalog_name REORGANIZE. For example, to reorganize a full-text catalog named ftCatalog in the AdventureWorks database, enter:

USE AdventureWorks;
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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