FIX: DBCC NEWALLOC Does Not Use the Read Ahead Manager

ID: Q134789

The information in this article applies to:

Microsoft SQL Server, version 6.0

BUG# NT: 10330 (6.00)

SYMPTOMS

When you perform a DBCC NEWALLOC in Microsoft SQL Server version 6.0, the Read Ahead counters in SQL Performance Monitor display no activity.

CAUSE

The Read Ahead Manager (RA) is a mechanism unique to SQL Server version 6.0 which independently pre-fetches pages from disk to the buffer cache anticipating a query thread's request for additional pages. The DBCC NEWALLOC command in SQL Server version 6.0 does not have the support required to trigger the RA during its scans.

WORKAROUND

You can run the DBCC CHECKALLOC statement instead of DBCC NEWALLOC, which does use the RA and provides similar functionality.

STATUS

Microsoft has confirmed this to be a problem in Microsoft SQL Server version 6.0. This problem was corrected in Service Pack 1 for SQL Server version 6.0. For more information, contact your primary support provider.

Additional query words: sql6

Keywords          : kbprg kbusage SSrvMon SSrvTran_SQL kbbug6.00 kbfix6.00.sp1 
Version           : 6.0
Platform          : WINDOWS

Last Reviewed: May 1, 1997