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10/04/2012

sp_autostats (Transact-SQL)

Displays or changes the automatic statistics update option, AUTO_UPDATE_STATISTICS, for an index, a statistics object, a table, or an indexed view.

For more information about the AUTO_UPDATE_STATISTICS option, see ALTER DATABASE SET Options (Transact-SQL) and Using Statistics to Improve Query Performance.

Topic link icon Transact-SQL Syntax Conventions

Syntax

sp_autostats [ @tblname= ] 'table_or_indexed_view_name' 
    [ , [ @flagc= ] 'stats_value' ] 
    [ , [ @indname= ] 'statistics_name' ]

Arguments

[ @tblname= ] 'table_or_indexed_view_name'
Is the name of the table or indexed view to display the AUTO_UPDATE_STATISTICS option on. table_or_indexed_view_name is nvarchar(776), with no default.
[ @flagc= ] 'stats_value'
Updates the AUTO_UPDATE_STATISTICS option to one of these values:

ON = ON

OFF = OFF

When stats_flag is not specified, display the current AUTO_UPDATE_STATISTICS setting. stats_value is varchar(10), with a default of NULL.
[ @indname= ] 'statistics_name'
Is the name of the statistics to display or update the AUTO_UPDATE_STATISTICS option on. To display the statistics for an index, you can use the name of the index; an index and its corresponding statistics object have the same name.

statistics_name is sysname, with a default of NULL.

Return Code Values

0 (success) or 1 (failure)

Result Sets

If stats_flag is specified, sp_autostats reports the action that was taken but returns no result set.

If stats_flag is not specified, sp_autostats returns the following result set.

Column name	Data type	Description
Index Name	varchar(60)	Name of the index or statistics.
AUTOSTATS	varchar(3)	Current value for the AUTO_UPDATE_STATISTICS option.
Last Updated	datetime	Date of the most recent statistics update.

The result set for a table or indexed view includes statistics created for indexes, single-column statistics generated with the AUTO_CREATE_STATISTICS option and statistics created with the CREATE STATISTICS statement.

Remarks

If the specified index is disabled, or the specified table has a disabled clustered index, an error message is displayed.

Permissions

To change the AUTO_UPDATE_STATISTICS option requires membership n the db_owner fixed database role, or ALTER permission on table_name.To display the AUTO_UPDATE_STATISTICS option requires membership in the public role.

Examples

A. Display the status of all statistics on a table

The following displays the status of all statistics on the Product table.

USE AdventureWorks2008R2;
GO
EXEC sp_autostats 'Production.Product';
GO

B. Enable AUTO_UPDATE_STATISTICS for all statistics on a table

The following enables the AUTO_UPDATE_STATISTICS option for all statistics on the Product table.

USE AdventureWorks2008R2;
GO
EXEC sp_autostats 'Production.Product', 'ON';
GO

C. Disable AUTO_UPDATE_STATISTICS for a specific index

The following example disables the AUTO_UPDATE_STATISTICS option for the AK_Product_Name index on the Product table.

USE AdventureWorks2008R2;
GO
EXEC sp_autostats 'Production.Product', 'OFF', AK_Product_Name;
GO

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