FIX: A deadlock condition may occur when you call the SQLFetch function or the SQLFetchScroll function in MDAC 2.8 (890470)


The information in this article applies to:

  • Microsoft Data Access Components 2.8

SYMPTOMS

When you call the SQLFetch function or the SQLFetchScroll function to return a result set from Microsoft SQL Server, a deadlock condition may occur. The deadlock condition occurs when the following conditions are true:
  • You use the LOCK_TIMEOUT setting in SQL Server.
  • You set the rowset size to a value that is larger than 1.
The deadlock condition occurs more frequently when you repeatedly call the SQLFetch function or the SQLFetchScroll function.

Note This problem does not occur when you set the rowset size to a value of 1.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft Data Access Components (MDAC) 2.8 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

No prerequisites are required.

Restart requirement

You must restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File 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 item in Control Panel.
   Date         Time   Version         Size     File name
   ---------------------------------------------------------
   03-Dec-2004  15:20  2000.85.1056.0   73,728  Dbnetlib.dll
   03-Dec-2004  15:21  2000.85.1056.0   28,672  Dbnmpntw.dll
   03-Dec-2004  15:20  2.80.1056.0     315,392  Msadce.dll
   03-Dec-2004  15:20  2.80.1056.0     135,168  Msadco.dll
   03-Dec-2004  15:20  2.80.1056.0      49,152  Msadcs.dll
   03-Dec-2004  15:20  2.80.1056.0     147,456  Msadds.dll
   03-Dec-2004  15:20  2.80.1056.0     512,000  Msado15.dll
   03-Dec-2004  15:20  2.80.1056.0     163,840  Msadomd.dll
   03-Dec-2004  15:20  2.80.1056.0     184,320  Msadox.dll
   03-Dec-2004  15:20  2.80.1056.0      53,248  Msadrh15.dll
   03-Dec-2004  15:20  2.80.1056.0     225,280  Msdaora.dll
   03-Dec-2004  15:20  2.80.1056.0     192,512  Msdaprst.dll
   03-Dec-2004  15:20  2.80.1056.0     147,456  Msdart.dll
   03-Dec-2004  15:20  2.80.1056.0     303,104  Msdasql.dll
   03-Dec-2004  15:21  2.575.1056.0    139,264  Msorcl32.dll
   03-Dec-2004  15:20  3.525.1056.0    221,184  Odbc32.dll
   03-Dec-2004  15:21  2000.85.1056.0   24,576  Odbcbcp.dll
   03-Dec-2004  15:20  2.80.1056.0     442,368  Oledb32.dll
   03-Dec-2004  15:20  2000.85.1056.0  503,808  Sqloledb.dll
   03-Dec-2004  15:20  2000.85.1056.0  401,408  Sqlsrv32.dll
   03-Dec-2004  15:08  2000.85.1056.0  208,896  Sqlxmlx.dll

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

When you call the SQLFetch function or the SQLFetchScroll function, a lock time-out error is not returned. Because a lock time-out error is not returned, your application cannot react appropriately, and the application may stop responding (hang).

For additional information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

839801 FIX: Hotfixes are available for MDAC 2.8

824684 Description of the standard terminology that is used to describe Microsoft software updates

Modification Type:MinorLast Reviewed:10/11/2006
Keywords:kbHotfixServer kbBug kbQFE kbprb KB890470 kbAudDeveloper kbAudITPRO
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