Статья
09/28/2010

TruncateLogOnCheckpoint Property

В будущей версии Microsoft SQL Server эта возможность будет удалена. Избегайте использования этой возможности в новых разработках и запланируйте изменение существующих приложений, в которых она применяется.

The TruncateLogOnCheckpoint property configures automatic transaction log maintenance activity.

Синтаксис

object.TruncateLogOnCheckpoint [= value]

Parts

object
An expression that evaluates to an object in the Applies To list
value
TRUE or FALSE

Data Type

Boolean

Modifiable

Read/write

Prototype (C/C++)

HRESULT GetTruncateLogOnCheckpoint(LPBOOL pRetVal);
HRESULT SetTruncateLogOnCheckpoint(BOOL NewValue);

Замечания

Periodically, and on certain user-directed actions, Microsoft SQL Server forces a write of dirty pages, ensuring data integrity at a point in time. The recovery interval option configures periodic dirty page writes. The Transact-SQL statement CHECKPOINT and other user-directed actions, such as initiating a complete database backup, force a dirty page write.

If TRUE, SQL Server removes log entries referencing committed transactions when activity on the database forces a dirty page write.

If FALSE, the forced dirty page writes have no effect on the database transaction log.

Важно!
Setting the TruncateLogOnCheckpoint property to TRUE implies that backup-maintained database integrity relies on backup of the database only. If TRUE, you cannot back up a database transaction log, and backup strategies based on differential backup of the log are not available. For more information, see Установка параметров базы данных.