Manage Full-Text Indexes

In This Topic

• Viewing and Changing the Properties of a Full-Text Index

• Viewing the Properties of Indexed Tables and Columns

• Getting Information about the Full-Text Key Column

• Disabling or Re-enabling a Table for Full-Text Indexing

• Removing a Full-Text Index from a Table

Viewing and Changing the Properties of a Full-Text Index

To view or change the properties of a full-text index in Management Studio

1. In Object Explorer, expand the server.

2. Expand Databases, and then expand the database that contains the full-text index.

3. Expand Tables.

4. Right-click the table on which the full-text index is defined, select Full-Text index, and on the Full-Text index context menu, click Properties. This opens the Full-text index Properties dialog box.

5. In the Select a page pane, you can select any of the following pages:

   Page	Description
   General	Displays basic properties of the full-text index. These include several modifiable properties and a number of unchangeable properties such as database name, table name, and the name of full-text key column. The modifiable properties are: Full-Text Index Stoplist Full-Text Indexing Enabled Change Tracking Search Property List For more information, see Full-Text Index Properties (General Page).
   Columns	Displays the table columns that are available for full-text indexing. The selected column or columns are full-text indexed. You can select as many of the available columns as you want to include in the full-text index. For more information, see Full-Text Index Properties (Columns Page).
   Schedules	Use this page to create or manage schedules for a SQL Server Agent job that starts an incremental table population for the full-text index populations. For more information, see Populate Full-Text Indexes. Important After you exit the Full-Text Index Properties dialog box, any newly created schedule is associated with a SQL Server Agent job (Start Incremental Table Population on database_name.table_name).

6. Click OK. to save any changes and exit the Full-text index Properties dialog box.

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Viewing the Properties of Indexed Tables and Columns

Several Transact-SQL functions such as OBJECTPROPERTYEX can be used to obtain the value of various full-text indexing properties. This information is useful for administering and troubleshooting full-text search.

The following table lists the full-text properties related to indexed tables and columns and their related Transact-SQL functions.

Property	Description	Function
FullTextTypeColumn	TYPE COLUMN in the table that holds the document type information of the column.	COLUMNPROPERTY
IsFulltextIndexed	Whether a column has been enabled for full-text indexing.	COLUMNPROPERTY
IsFulltextKey	Whether the index is the full-text key for a table.	INDEXPROPERTY
TableFulltextBackgroundUpdateIndexOn	Whether a table has full-text background update indexing.	OBJECTPROPERTYEX
TableFulltextCatalogId	Full-text catalog ID in which the full-text index data for the table resides.	OBJECTPROPERTYEX
TableFulltextChangeTrackingOn	Whether a table has full-text change-tracking enabled.	OBJECTPROPERTYEX
TableFulltextDocsProcessed	Number of rows processed since the start of full-text indexing.	OBJECTPROPERTYEX
TableFulltextFailCount	Number of rows Full-Text Search did not index.	OBJECTPROPERTYEX
TableFulltextItemCount	Number of rows that were successfully full-text indexed.	OBJECTPROPERTYEX
TableFulltextKeyColumn	The column ID of the full-text unique key column.	OBJECTPROPERTYEX
TableFullTextMergeStatus	Whether a table that has a full-text index is currently in merging.	OBJECTPROPERTYEX
TableFulltextPendingChanges	Number of pending change tracking entries to process.	OBJECTPROPERTYEX
TableFulltextPopulateStatus	Population status of a full-text table.	OBJECTPROPERTYEX
TableHasActiveFulltextIndex	Whether a table has an active full-text index.	OBJECTPROPERTYEX

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Getting Information about the Full-Text Key Column

Typically, the result of CONTAINSTABLE or FREETEXTTABLE rowset-valued functions need to be joined with the base table. In such cases, you need to know the unique key column name. You can inquire whether a given unique index is used as the full-text key, and you can obtain the identifier of the full-text key column.

To inquire whether a given unique index is used as the full-text key column

• Use a SELECT statement to call the INDEXPROPERTY function. In the function call use the OBJECT_ID function to convert the name of the table (table_name) into the table ID, specify the name of a unique index for the table, and specify the IsFulltextKey index property, as follows:

  SELECT INDEXPROPERTY( OBJECT_ID('table_name'), 'index_name',  'IsFulltextKey' );
  

  This statement returns 1 if the index is used to enforce uniqueness of the full-text key column and 0 if it is not.

Example

The following example inquires whether the PK_Document_DocumentID index is used to enforce the uniqueness of the full-text key column, as follows:

USE AdventureWorks
GO
SELECT INDEXPROPERTY ( OBJECT_ID('Production.Document'), 'PK_Document_DocumentID',  'IsFulltextKey' )

This example returns 1 if the PK_Document_DocumentID index is used to enforce uniqueness of the full-text key column. Otherwise, it returns 0 or NULL. NULL implies you are using an invalid index name, the index name does not correspond to the table, the table does not exist, or so forth.

To find the identifier of the full-text key column

• Each full-text enabled table has a column that is used to enforce unique rows for the table (the unique key column). The TableFulltextKeyColumn property, obtained from the OBJECTPROPERTYEX function, contains the column ID of the unique key column.

  To obtain this identifier, you can use a SELECT statement to call the OBJECTPROPERTYEX function. Use the OBJECT_ID function to convert the name of the table (table_name) into the table ID and specify the TableFulltextKeyColumn property, as follows:

  SELECT OBJECTPROPERTYEX(OBJECT_ID( 'table_name'), 'TableFulltextKeyColumn' ) AS 'Column Identifier';
  

Examples

The following example returns the identifier of the full-text key column or NULL. NULL implies that you are using an invalid index name, the index name does not correspond to the table, the table does not exist, or so forth.

USE AdventureWorks;
GO
SELECT OBJECTPROPERTYEX(OBJECT_ID('Production.Document'), 'TableFulltextKeyColumn');
GO

The following example shows how to use the identifier of the unique key column to obtain the name of the column.

USE AdventureWorks;
GO
DECLARE @key_column sysname
SET @key_column = Col_Name(Object_Id('Production.Document'),
ObjectProperty(Object_id('Production.Document'),
'TableFulltextKeyColumn') 
)
SELECT @key_column AS 'Unique Key Column';
GO

This example returns a result set column named Unique Key Column, which displays a single row containing the name of the unique key column of the Document table, DocumentID. Note that if this query contained an invalid index name, the index name did not correspond to the table, the table did not exist, and so forth, it would return NULL.

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Disabling or Re-enabling a Table for Full-Text Indexing

In SQL Server, all user-created databases are full-text enabled by default. Additionally, an individual table is automatically enabled for full-text indexing as soon as a full-text index is created on it and a column is added to the index. A table is automatically disabled for full-text indexing when the last column is dropped from its full-text index.

On a table that has a full-text index, you can manually disable or re-enable a table for full-text indexing using SQL Server Management Studio.

To enable a table for full-text indexing

1. Expand the server group, expand Databases, and expand the database that contains the table you want to enable for full-text indexing.

2. Expand Tables, and right-click the table that you want to disable or re-enable for full-text indexing.

3. Select Full-Text index, and then click Disable Full-Text index or Enable Full-Text index.

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Removing a Full-Text Index from a Table

To remove a full-text index from a table

1. In Object Explorer, right-click the table that has the full-text index that you want to delete.

2. Select Delete Full-Text index.

3. When prompted, click OK to confirm that you want to delete the full-text index.

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