Article ID: 831999
Article Last Modified on 11/2/2007
APPLIES TO
- Microsoft SQL Server 2000 Developer Edition
- Microsoft SQL Server 2000 Standard Edition
- Microsoft SQL Server 2000 Enterprise Edition
- Microsoft SQL Server 2000 Personal Edition
- Microsoft SQL Server 2000 Enterprise Edition
- Microsoft SQL Server 2000 Workgroup Edition
- Microsoft SQL Server 2000 Developer Edition
- Microsoft SQL Server 2000 Enterprise Edition 64-bit
Bug #: 469995 (Shiloh_bugs)
SYMPTOMS
The memory that SQL Server uses during sorting and hashing operations is allocated from the buffer pool as a stolen buffer. Stolen buffers must always remain in the virtual address space. They cannot be unmapped to a Microsoft Windows 2000 Address Windowing Extensions (AWE) location. SQL Server uses a throttle to limit how much memory can be used for sorting and for hashing. SQL Server limits the memory for these reasons:
- So that the whole buffer pool will not be consumed by stolen buffers.
- So that the buffer pool can continue to serve as a data cache.
On systems with AWE enabled, the computation of how much memory can be used as workspace memory for sorting and for hashing is sometimes higher than it is on a non-AWE system. Because stolen buffers must always remain in the address space, the additional AWE memory should be irrelevant to this computation. The fix that is discussed in this article corrects the problem so that the computation of the workspace available for sorting and for hashing is consistent across both configurations.
Because of the miscalculation, sort and hash operations may try to use more memory from the buffer pool than can remain mapped. As a result, a BPool::Map error that is similar to the following is written to the SQL Server error log followed by the output of the DBCC MEMORYSTATUS command:
In the output that is shown earlier, you can see that SQL Server will allow multiple queries that are requesting a total of 140712 buffers to run concurrently. In the earlier example, there are six queries that are executing with sorts or with hashes. These six queries have been granted the use of 130303 buffers (140712 - 10409 = 130303).
RESOLUTION
Service pack information
To resolve this problem, obtain the latest service pack for Microsoft SQL Server 2000. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
290211 How to obtain the latest SQL Server 2000 service pack
Hotfix information
The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date Time Version Size File name ------------------------------------------------------------------------------ 31-May-2003 18:45 2000.80.818.0 78,400 Console.exe 28-Oct-2003 04:21 2000.80.873.0 315,968 Custtask.dll 02-Oct-2003 20:59 2000.80.867.0 33,340 Dbmslpcn.dll 25-Apr-2003 02:12 786,432 Distmdl.ldf 25-Apr-2003 02:12 2,359,296 Distmdl.mdf 30-Jan-2003 01:55 180 Drop_repl_hotfix.sql 12-Sep-2003 03:26 2000.80.859.0 1,905,216 Dtspkg.dll 26-Aug-2003 20:16 2000.80.854.0 528,960 Dtspump.dll 23-Jun-2003 22:40 2000.80.837.0 1,557,052 Dtsui.dll 23-Jun-2003 22:40 2000.80.837.0 639,552 Dtswiz.dll 24-Apr-2003 02:51 747,927 Instdist.sql 03-May-2003 01:56 1,581 Inst_repl_hotfix.sql 08-Feb-2003 06:40 2000.80.765.0 90,692 Msgprox.dll 01-Apr-2003 02:07 1,873 Odsole.sql 05-Apr-2003 01:46 2000.80.800.0 62,024 Odsole70.dll 07-May-2003 20:41 2000.80.819.0 25,144 Opends60.dll 02-Apr-2003 21:48 2000.80.796.0 57,904 Osql.exe 02-Apr-2003 23:15 2000.80.797.0 279,104 Pfutil80.dll 04-Aug-2003 18:17 550,780 Procsyst.sql 12-Sep-2003 00:37 12,305 Qfe469315.sql 22-May-2003 22:57 19,195 Qfe469571.sql 06-Sep-2003 01:36 1,090,932 Replmerg.sql 06-Sep-2003 07:18 2000.80.858.0 221,768 Replprov.dll 06-Sep-2003 07:18 2000.80.858.0 307,784 Replrec.dll 06-Sep-2003 00:00 1,087,150 Replsys.sql 13-Aug-2003 16:28 986,603 Repltran.sql 22-Oct-2003 00:08 2000.80.871.0 57,916 Semnt.dll 29-Jul-2003 20:13 2000.80.819.0 492,096 Semobj.dll 31-May-2003 18:27 2000.80.818.0 172,032 Semobj.rll 05-Aug-2003 21:06 127,884 Sp3_serv_uni.sql 01-Jun-2003 01:01 2000.80.818.0 4,215,360 Sqldmo.dll 07-Apr-2003 17:44 25,172 Sqldumper.exe 19-Mar-2003 18:20 2000.80.789.0 28,672 Sqlevn70.rll 27-Sep-2003 04:42 2000.80.865.0 180,792 Sqlmap70.dll 03-Sep-2003 02:56 2000.80.857.0 188,992 Sqlmmc.dll 02-Sep-2003 23:03 2000.80.857.0 479,232 Sqlmmc.rll 22-Oct-2003 00:08 2000.80.871.0 401,984 Sqlqry.dll 08-Feb-2003 06:40 2000.80.765.0 57,920 Sqlrepss.dll 05-Nov-2003 20:52 2000.80.876.0 7,606,353 Sqlservr.exe 25-Jul-2003 21:44 2000.80.845.0 590,396 Sqlsort.dll 08-Feb-2003 06:40 2000.80.765.0 45,644 Sqlvdi.dll 02-Oct-2003 20:59 2000.80.867.0 33,340 Ssmslpcn.dll 01-Jun-2003 01:01 2000.80.818.0 82,492 Ssnetlib.dll 01-Jun-2003 01:01 2000.80.818.0 25,148 Ssnmpn70.dll 28-Oct-2003 04:21 2000.80.873.0 123,456 Stardds.dll 01-Jun-2003 01:01 2000.80.818.0 158,240 Svrnetcn.dll 31-May-2003 18:59 2000.80.818.0 76,416 Svrnetcn.exe 30-Apr-2003 23:52 2000.80.816.0 45,132 Ums.dll 02-Jul-2003 00:19 2000.80.834.0 98,816 Xpweb70.dll
Note Because of file dependencies, the most recent hotfix or feature that contains these files may also contain additional files.
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This problem was first corrected in Microsoft SQL Server 2000 Service Pack 4.
MORE INFORMATION
If the BPool::Map error occurs while a DBCC DBREINDEX statement or a CREATE INDEX statement is running, see the following article in the Microsoft Knowledge Base:
838459 FIX: You may receive a BPool::Map warning when you create or rebuild indexes by using the awe enabled configuration option
Microsoft Knowledge Base article 838459 discusses a fix that may be more likely to explain the true cause of the error.
REFERENCES
For additional information about software updates, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Keywords: kbbug kbfix kbqfe kbsqlserv2000presp4fix kbhotfixserver KB831999