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:
2003-06-23 04:17:14.86 spid153 BPool::Map: no remappable
address found.
2003-06-23 04:17:15.04 spid92 Buffer Distribution:
Stolen=133972 Free=10785 Procedures=17346 Inram=0 Dirty=155429 Kept=0 I/O=2,
Latched=988, Other=513478
2003-06-23 04:17:15.06 spid92 Buffer Counts:
Commited=832000 Target=832000 Hashed=669897 InternalReservation=1514
ExternalReservation=4255 Min Free=1024
2003-06-23 04:17:15.06 spid92
Procedure Cache: TotalProcs=8505 TotalPages=17346 InUsePages=6439
2003-06-23 04:17:15.06 spid92 Dynamic Memory Manager: Stolen=25253 OS
Reserved=1776 OS Committed=1735 OS In Use=1644 Query Plan=17383 Optimizer=0
General=7999 Utilities=243 Connection=907
2003-06-23 04:17:15.06 spid92
Global Memory Objects: Resource=3259 Locks=102 SQLCache=773 Replication=2
LockBytes=2 ServerGlobal=3528 Xact=110
2003-06-23 04:17:15.06 spid92 Query
Memory Manager: Grants=6 Waiting=0 Maximum=140712
Available=10409
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.