FIX: Intense SQL Server activity results in spinloop wait

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BUG #: 469415 (SQL Server 8.0)

SYMPTOMS

Under extremely rare circumstances, SQL Server can experience a 5-second "batch requests" stall condition. This is frequently described as delayed or stalled batch event processing for a 5-second period that is accompanied by a spike in SQL Server connections during or immediately following the stall pattern.

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RESOLUTION

Service pack information

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:

290211 (http://support.microsoft.com/kb/290211/ ) How to obtain the latest SQL Server 2000 service pack

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Hotfix information

The English version of this hotfix has the file attributes (or later file attributes) 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
   ----------------------------------------------------------------------------
   26-Feb-2003  03:41  2000.80.777.0      29,244 bytes  Dbmslpcn.dll     
   25-Apr-2003  02:12                    786,432 bytes  Distmdl.ldf
   25-Apr-2003  02:12                  2,359,296 bytes  Distmdl.mdf
   30-Jan-2003  01:55                        180 bytes  Drop_repl_hotfix.sql
   07-Apr-2003  19:15  2000.80.801.0   1,557,052 bytes  Dtsui.dll        
   24-Apr-2003  02:51                    747,927 bytes  Instdist.sql
   30-Jan-2003  01:55                      1,402 bytes  Inst_repl_hotfix.sql
   08-Feb-2003  06:40  2000.80.765.0      90,692 bytes  Msgprox.dll      
   01-Apr-2003  02:07                      1,873 bytes  Odsole.sql
   05-Apr-2003  01:46  2000.80.800.0      62,024 bytes  Odsole70.dll     
   02-Apr-2003  21:48  2000.80.796.0      57,904 bytes  Osql.exe         
   02-Apr-2003  23:15  2000.80.797.0     279,104 bytes  Pfutil80.dll     
   04-Apr-2003  21:27                  1,083,467 bytes  Replmerg.sql
   04-Apr-2003  21:53  2000.80.798.0     221,768 bytes  Replprov.dll     
   08-Feb-2003  06:40  2000.80.765.0     307,784 bytes  Replrec.dll      
   01-Apr-2003  02:23                  1,084,828 bytes  Replsys.sql
   16-Apr-2003  22:39                    115,892 bytes  Sp3_serv_uni.sql
   07-Apr-2003  17:44                     25,172 bytes  Sqldumper.exe    
   19-Mar-2003  18:20  2000.80.789.0      28,672 bytes  Sqlevn70.rll
   24-Apr-2003  05:39  2000.80.811.0     176,696 bytes  Sqlmap70.dll     
   08-Feb-2003  06:40  2000.80.765.0      57,920 bytes  Sqlrepss.dll     
   30-Apr-2003  23:52  2000.80.816.0   7,540,817 bytes  Sqlservr.exe     
   08-Feb-2003  06:40  2000.80.765.0      45,644 bytes  Sqlvdi.dll       
   26-Feb-2003  03:41  2000.80.777.0      29,244 bytes  Ssmslpcn.dll     
   26-Feb-2003  03:41  2000.80.777.0      82,492 bytes  Ssnetlib.dll     
   30-Apr-2003  23:52  2000.80.816.0      45,132 bytes  Ums.dll  
   28-Feb-2003  01:34  2000.80.778.0      98,872 bytes  Xpweb70.dll

Note Because of file dependencies, the most recent hotfix or feature that contains the files may also contain additional files.
Note This hotfix does not apply to SQL Server 2000 64-bit.

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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft SQL Server 2000 Service Pack 4.

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MORE INFORMATION

SQL Server 2000 uses spin count synchronization primitives to provide appropriate internal synchronization and access to internal structures.

For more information about spinning synchronization, visit the following Microsoft Web site:

InitializeCriticalSectionAndSpinCount (http://msdn2.microsoft.com/en-us/library/ms683476.aspx)
When the spin count is exceeded, the penalty can result in up to a 5,000-millisecond delay and the status of the server process ID in the sysprocesses table changes to spinloop. A status equal to spinloop indicates that you may be experiencing the problem. This correction reduces the delay to a maximum of 1 millisecond.

Note It is highly unusual to see this situation on a single processor computer.

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