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ALTER FULLTEXT CATALOG (Transact-SQL)

  • Artikkeli

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance

Changes the properties of a full-text catalog.

Transact-SQL syntax conventions

Syntax

ALTER FULLTEXT CATALOG catalog_name   
{ REBUILD [ WITH ACCENT_SENSITIVITY = { ON | OFF } ]  
| REORGANIZE  
| AS DEFAULT   
}

Arguments

catalog_name
Specifies the name of the catalog to be modified. If a catalog with the specified name does not exist, Microsoft SQL Server returns an error and does not perform the ALTER operation.

REBUILD
Tells SQL Server to rebuild the entire catalog. When a catalog is rebuilt, the existing catalog is deleted and a new catalog is created in its place. All the tables that have full-text indexing references are associated with the new catalog. Rebuilding resets the full-text metadata in the database system tables.

WITH ACCENT_SENSITIVITY = {ON|OFF}
Specifies if the catalog to be altered is accent-sensitive or accent-insensitive for full-text indexing and querying.

To determine the current accent-sensitivity property setting of a full-text catalog, use the FULLTEXTCATALOGPROPERTY function with the accentsensitivity property value against catalog_name. If the function returns '1', the full-text catalog is accent sensitive; if the function returns '0', the catalog is not accent sensitive.

The catalog and database default accent sensitivity are the same.

REORGANIZE
Tells SQL Server to perform a master merge, which involves merging the smaller indexes created in the process of indexing into one large index. Merging the full-text index fragments can improve performance and free up disk and memory resources. If there are frequent changes to the full-text catalog, use this command periodically to reorganize the full-text catalog.

REORGANIZE also optimizes internal index and catalog structures.

Keep in mind that, depending on the amount of indexed data, a master merge may take some time to complete. Master merging a large amount of data can create a long running transaction, delaying truncation of the transaction log during checkpoint. In this case, the transaction log might grow significantly under the full recovery model. As a best practice, ensure that your transaction log contains sufficient space for a long-running transaction before reorganizing a large full-text index in a database that uses the full recovery model. For more information, see Manage the Size of the Transaction Log File.

AS DEFAULT
Specifies that this catalog is the default catalog. When full-text indexes are created with no specified catalogs, the default catalog is used. If there is an existing default full-text catalog, setting this catalog AS DEFAULT will override the existing default.

Permissions

User must have ALTER permission on the full-text catalog, or be a member of the db_owner, db_ddladmin fixed database roles, or sysadmin fixed server role.

Note

To use ALTER FULLTEXT CATALOG AS DEFAULT, the user must have ALTER permission on the full-text catalog and CREATE FULLTEXT CATALOG permission on the database.

Examples

The following example changes the accentsensitivity property of the default full-text catalog ftCatalog, which is accent sensitive.

--Change to accent insensitive  
USE AdventureWorks2022;  
GO  
ALTER FULLTEXT CATALOG ftCatalog   
REBUILD WITH ACCENT_SENSITIVITY=OFF;  
GO  
-- Check Accentsensitivity  
SELECT FULLTEXTCATALOGPROPERTY('ftCatalog', 'accentsensitivity');  
GO  
--Returned 0, which means the catalog is not accent sensitive.

See Also

sys.fulltext_catalogs (Transact-SQL)
CREATE FULLTEXT CATALOG (Transact-SQL)
DROP FULLTEXT CATALOG (Transact-SQL)
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