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10/04/2012

DBCC UPDATEUSAGE (Transact-SQL)

Reports and corrects pages and row count inaccuracies in the catalog views. These inaccuracies may cause incorrect space usage reports returned by the sp_spaceused system stored procedure.

Topic link icon Transact-SQL Syntax Conventions

Syntax

DBCC UPDATEUSAGE 
(   { database_name | database_id | 0 } 
    [ , { table_name | table_id | view_name | view_id } 
    [ , { index_name | index_id } ] ] 
) [ WITH [ NO_INFOMSGS ] [ , ] [ COUNT_ROWS ] ]

Arguments

database_name | database_id | 0
Is the name or ID of the database for which to report and correct space usage statistics. If 0 is specified, the current database is used. Database names must comply with the rules for identifiers.
table_name | table_id | view_name | view_id
Is the name or ID of the table or indexed view for which to report and correct space usage statistics. Table and view names must comply with the rules for identifiers.
index_id | index_name
Is the ID or name of the index to use. If not specified, the statement processes all indexes for the specified table or view.
WITH
Allows options to be specified.
NO_INFOMSGS
Suppresses all informational messages.
COUNT_ROWS
Specifies that the row count column is updated with the current count of the number of rows in the table or view.

Remarks

DBCC UPDATEUSAGE corrects the rows, used pages, reserved pages, leaf pages and data page counts for each partition in a table or index. If there are no inaccuracies in the system tables, DBCC UPDATEUSAGE returns no data. If inaccuracies are found and corrected and WITH NO_INFOMSGS is not used, DBCC UPDATEUSAGE returns the rows and columns being updated in the system tables.

DBCC CHECKDB has been enhanced to detect when page or row counts become negative. When detected, the DBCC CHECKDB output contains a warning and a recommendation to run DBCC UPDATEUSAGE to address the issue.

Best Practices

Always run DBCC UPDATEUSAGE after upgrading a database from SQL Server 2000. The page and row counts are corrected and are maintained thereafter.
Do not run DBCC UPDATEUSAGE routinely for databases created in SQL Server 2005 or higher or on upgraded databases that have been corrected once by using DBCC UPDATEUSAGE. Because DBCC UPDATEUSAGE can take some time to run on large tables or databases, it should not be used only unless you suspect incorrect values are being returned by sp_spaceused.
Consider running DBCC UPDATEUSAGE routinely (for example, weekly) only if the database undergoes frequent Data Definition Language (DDL) modifications, such as CREATE, ALTER, or DROP statements.

Result Sets

DBCC UPDATEUSAGE returns (values may vary):

DBCC execution completed. If DBCC printed error messages, contact your system administrator.

Permissions

Requires membership in the sysadmin fixed server role or the db_owner fixed database role.

Examples

A. Updating page or row counts or both for all objects in the current database

The following example specifies 0 for the database name and DBCC UPDATEUSAGE reports updated page or row count information for the current database.

DBCC UPDATEUSAGE (0);
GO

B. Updating page or row counts or both and suppressing informational messages

The following example specifies AdventureWorks2008R2 as the database name and suppresses all informational messages.

USE AdventureWorks2008R2;
GO
DBCC UPDATEUSAGE (AdventureWorks2008R2) WITH NO_INFOMSGS; 
GO

C. Updating page or row counts or both for a table

The following example reports updated page or row count information for the Employee table in the AdventureWorks2008R2 database.

USE AdventureWorks2008R2;
GO
DBCC UPDATEUSAGE (AdventureWorks2008R2,"HumanResources.Employee");
GO

D. Updating page or row counts or both for a specific index in a table

The following example specifies an index name.

USE AdventureWorks2008R2;
GO
DBCC UPDATEUSAGE (AdventureWorks2008R2, "HumanResources.Employee", IX_Employee_OrganizationLevel_OrganizationNode);
GO

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