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sp_autostats (Transact-SQL)

  • Artikkeli

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

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 and Statistics.

Transact-SQL syntax conventions

Syntax

sp_autostats
    [ @tblname = ] N'tblname'
    [ , [ @flagc = ] 'flagc' ]
    [ , [ @indname = ] N'indname' ]
[ ; ]

Arguments

[ @tblname = ] N'tblname'

The name of the table or indexed view for which to display the AUTO_UPDATE_STATISTICS option. @tblname is nvarchar(776), with no default.

[ @flagc = ] 'flagc'

Updates or displays the AUTO_UPDATE_STATISTICS option. @flagc is varchar(10), and can be one of these values:

Value Description
ON On
OFF Off
Not specified Displays the current AUTO_UPDATE_STATISTICS setting

[ @indname = ] N'indname'

The name of the statistics for which to display or update the AUTO_UPDATE_STATISTICS option. @indname is sysname, with a default of NULL. 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.

Return code values

0 (success) or 1 (failure).

Result set

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

If @flagc isn't specified, sp_autostats returns the following result set.

Column name Data type Description
Index Name sysname 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.

AUTO_UPDATE_STATISTICS is always OFF for memory-optimized tables.

Permissions

To change the AUTO_UPDATE_STATISTICS option, you need membership in the db_owner fixed database role, or ALTER permission on @tblname.

To display the AUTO_UPDATE_STATISTICS option, you need 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 Production.Product table.

USE AdventureWorks2022;
GO
EXEC sp_autostats 'Production.Product';
GO

B. Enable AUTO_UPDATE_STATISTICS for all statistics on a table

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

USE AdventureWorks2022;
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 Production.Product table.

USE AdventureWorks2022;
GO
EXEC sp_autostats 'Production.Product', 'OFF', AK_Product_Name;
GO

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