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= <span id="KB835864"></span>FIX: Intermittent query slowdowns and corresponding high CPU utilization =<br />
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Article ID: 835864<br />
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Article Last Modified on 11/2/2007<br />
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APPLIES TO<br /><br />
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* Microsoft SQL Server 2000 Developer Edition<br />
* Microsoft SQL Server 2000 Standard Edition<br />
* Microsoft SQL Server 2000 Enterprise Edition<br />
* Microsoft SQL Server 2000 Personal Edition<br />
* Microsoft SQL Server 2000 Enterprise Edition<br />
* Microsoft SQL Server 2000 Workgroup Edition<br />
* Microsoft SQL Server 2000 Desktop Engine (Windows)<br />
* Microsoft SQL Server 2000 Developer Edition<br />
* Microsoft SQL Server 2000 Enterprise Edition 64-bit<br />
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<div class="notice_section"><br />
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Bug #: 470933 (SHILOH_BUGS)<br /><br />
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Microsoft SQL Server 2000 fixes are distributed as one downloadable file. Because the fixes are cumulative, each new release contains all the hotfixes and all the security fixes that were included in the previous SQL Server 2000 fix release.<br />
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<div class="symptoms_section"><br />
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== SYMPTOMS ==<br />
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You have a workload that is running on a multiprocessor computer that forces SQL Server to perform many memory allocation operations and memory free operations each second (several hundred small batches that require compilation each second, for example). You may notice that a query that typically runs in a certain time takes longer to complete, although the query processes the same amount of data, uses the same query plan, and performs the same amount of I/O. The only noticeable difference is an increase in the CPU time and the elapsed time that it takes to run the query. In extreme cases, you may find that simple queries (such as SET ROWCOUNT 0) might take several hundred milliseconds to run and several hundred milliseconds of CPU time.<br />
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<div class="resolution_section"><br />
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== RESOLUTION ==<br />
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=== Service pack information ===<br />
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To resolve this problem, obtain the latest service pack for Microsoft SQL Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:<br />
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[[../290211|290211]] How to obtain the latest SQL Server 2000 service pack<br />
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=== Hotfix information ===<br />
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The English version of this hotfix 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.<br />
<pre class="fixed_text"> Date Time Version Size File name<br />
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31-May-2003 18:45 2000.80.818.0 78,400 Console.exe <br />
28-Oct-2003 04:21 2000.80.873.0 315,968 Custtask.dll <br />
02-Oct-2003 20:59 2000.80.867.0 33,340 Dbmslpcn.dll <br />
25-Apr-2003 02:12 786,432 Distmdl.ldf<br />
25-Apr-2003 02:12 2,359,296 Distmdl.mdf<br />
30-Jan-2003 01:55 180 Drop_repl_hotfix.sql<br />
12-Sep-2003 03:26 2000.80.859.0 1,905,216 Dtspkg.dll <br />
26-Aug-2003 20:16 2000.80.854.0 528,960 Dtspump.dll <br />
23-Jun-2003 22:40 2000.80.837.0 1,557,052 Dtsui.dll <br />
23-Jun-2003 22:40 2000.80.837.0 639,552 Dtswiz.dll <br />
24-Apr-2003 02:51 747,927 Instdist.sql<br />
10-Oct-2003 18:52 745,961 Instmsdb.sql<br />
03-May-2003 01:56 1,581 Inst_repl_hotfix.sql<br />
08-Feb-2003 06:40 2000.80.765.0 90,692 Msgprox.dll <br />
01-Apr-2003 02:07 1,873 Odsole.sql<br />
05-Apr-2003 01:46 2000.80.800.0 62,024 Odsole70.dll <br />
07-May-2003 20:41 2000.80.819.0 25,144 Opends60.dll <br />
02-Apr-2003 21:48 2000.80.796.0 57,904 Osql.exe <br />
02-Apr-2003 23:15 2000.80.797.0 279,104 Pfutil80.dll <br />
04-Aug-2003 18:17 550,780 Procsyst.sql<br />
12-Sep-2003 00:37 12,305 Qfe469315.sql<br />
22-May-2003 22:57 19,195 Qfe469571.sql<br />
20-Jan-2004 00:45 1,090,380 Replmerg.sql<br />
06-Sep-2003 07:18 2000.80.858.0 221,768 Replprov.dll <br />
16-Jan-2004 01:24 2000.80.908.0 307,784 Replrec.dll <br />
16-Jan-2004 01:13 2000.80.908.0 159,813 Replres.rll<br />
06-Sep-2003 00:00 1,087,150 Replsys.sql<br />
13-Aug-2003 16:28 986,603 Repltran.sql<br />
02-Jan-2004 19:42 2000.80.904.0 287,304 Rinitcom.dll <br />
22-Oct-2003 00:08 2000.80.871.0 57,916 Semnt.dll <br />
29-Jul-2003 20:13 2000.80.819.0 492,096 Semobj.dll <br />
31-May-2003 18:27 2000.80.818.0 172,032 Semobj.rll<br />
02-Jan-2004 19:42 2000.80.904.0 53,832 Snapshot.exe <br />
09-Dec-2003 20:07 117,834 Sp3_serv_uni.sql<br />
16-Jan-2004 01:23 2000.80.908.0 28,672 Sqlagent.dll <br />
16-Jan-2004 01:24 2000.80.908.0 311,872 Sqlagent.exe <br />
07-Jan-2004 22:38 2000.80.905.0 126,976 Sqlakw32.dll <br />
01-Jun-2003 01:01 2000.80.818.0 4,215,360 Sqldmo.dll <br />
07-Apr-2003 17:44 25,172 Sqldumper.exe <br />
19-Mar-2003 18:20 2000.80.789.0 28,672 Sqlevn70.rll<br />
27-Sep-2003 04:42 2000.80.865.0 180,792 Sqlmap70.dll <br />
03-Sep-2003 02:56 2000.80.857.0 188,992 Sqlmmc.dll <br />
02-Sep-2003 23:03 2000.80.857.0 479,232 Sqlmmc.rll<br />
22-Oct-2003 00:08 2000.80.871.0 401,984 Sqlqry.dll <br />
08-Feb-2003 06:40 2000.80.765.0 57,920 Sqlrepss.dll <br />
24-Jan-2004 01:59 2000.80.910.0 7,610,449 Sqlservr.exe <br />
25-Jul-2003 21:44 2000.80.845.0 590,396 Sqlsort.dll <br />
08-Feb-2003 06:40 2000.80.765.0 45,644 Sqlvdi.dll <br />
24-Jan-2004 01:59 2000.80.910.0 106,588 Sqsrvres.dll <br />
02-Oct-2003 20:59 2000.80.867.0 33,340 Ssmslpcn.dll <br />
01-Jun-2003 01:01 2000.80.818.0 82,492 Ssnetlib.dll <br />
01-Jun-2003 01:01 2000.80.818.0 25,148 Ssnmpn70.dll <br />
28-Oct-2003 04:21 2000.80.873.0 123,456 Stardds.dll <br />
01-Jun-2003 01:01 2000.80.818.0 158,240 Svrnetcn.dll <br />
31-May-2003 18:59 2000.80.818.0 76,416 Svrnetcn.exe <br />
30-Apr-2003 23:52 2000.80.816.0 45,132 Ums.dll <br />
02-Jul-2003 00:19 2000.80.834.0 98,816 Xpweb70.dll </pre><br />
'''Note''' Because of file dependencies, the most recent hotfix or feature that contains these files may also contain additional files.<br />
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<div class="status_section"><br />
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== STATUS ==<br />
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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section of this article.<br /><br />
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This problem was first corrected in Microsoft SQL Server 2000 Service Pack 4.<br />
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<div class="moreinformation_section"><br />
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== MORE INFORMATION ==<br />
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For additional information, click the following article number to view the article in the Microsoft Knowledge Base:<br />
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[[../824684|824684]] Description of the Standard Terminology That Is Used to Describe Microsoft Software Updates<br />
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Most memory allocation requests in SQL Server are handled by allocating a page from the buffer pool. SQL Server maintains counters to track how many pages have been stolen from the buffer pool to be use as a generic memory buffer instead of a buffer for a database page. The DBCC MEMORYSTATUS command makes part of this information available and is automatically logged in the error log in certain out-of-memory conditions. These numbers are also used to trigger other events in the server, such as the lazywriter process. For additional information about these counters and stolen memory, click the following article number to view the article in the Microsoft Knowledge Base:<br />
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[[../271624|271624]] INF: Using DBCC MEMORYSTATUS to monitor SQL Server memory usage<br />
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On multiprocessor computers, access to these counter values must be serialized. SQL Server serializes the counter values by using a spinlock. With a spinlock, the thread that wants to acquire the spinlock tries to acquire the lock. If the lock is not available, the thread spins in a loop, periodically rechecking the availability of the resource. If the operation that occurs inside the spinlock protection has a very short duration, such as incrementing or decrementing a counter, using a spinlock can be much faster than using a kernel synchronization object and then switching from user mode to kernel mode and back. However, if the spinlock becomes highly contended, a thread may spend more time spinning and trying to acquire the lock than it does performing useful work. Because of this, spinlocks are not a good choice for protecting a heavily-contended data structure.<br /><br />
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This hotfix uses a different synchronization mechanism to maintain these counter values. It requires a substantial amount of contention to cause any noticeable delay or increase in CPU time. Typically, you must have a server with 8 or more processors (so that 8 threads are running at the same time) to be able to process a workload that can generate this much contention. This much contention may be more likely to occur if hyperthreading is enabled because it effectively doubles the number of SQL threads that can be running.<br />
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Keywords: kbbug kbfix kbqfe kbsqlserv2000presp4fix kbhotfixserver KB835864<br />
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