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FIX : Use of a Fast Forward Cursor with a UNION Operator and a Remote Table May Cause Access Violation

Article ID: 312294 - View products that this article applies to.

Hotfix Download Available

This article was previously published under Q312294

BUG #: 356004 (SHILOH_BUGS)

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SYMPTOMS

If you use a FAST_FORWARD cursor that is built on a query that contains a UNION operator and a remote table, an exception Access Violation (AV) may occur.

You will see an error message in Query Analyzer similar to:

ODBC: Msg 0, Level 19, State 1 SqlDumpExceptionHandler: Process 52 generated fatal exception c0000005 EXCEPTION_ACCESS_VIOLATION. SQL Server is terminating this process. Connection Broken

NOTE: Other data access tools return similar error messages. This call stack is in the SQL Server 2000 error log if you do not have any service packs installed:

007E1091 Module(sqlservr+003E1091) CCvtTree::PdrgcidBldColumns
007D8169 Module(sqlservr+003D8169) CCvtTree::PexprBuildQuery
007D775C Module(sqlservr+003D775C) CCvtTree::PexprFromTree
005642A9 Module(sqlservr+001642A9) CCvtTree::PqryFromTree
00564019 Module(sqlservr+00164019) BuildQueryFromTree
005D285A Module(sqlservr+001D285A) CFetchKeyset::CompileQuery
005D3050 Module(sqlservr+001D3050) CFetchKeyset::CompileSetFetchExp
005D32DA Module(sqlservr+001D32DA) CFetchKeyset::CompileKeysetExprs
005D3428 Module(sqlservr+001D3428) CFetchKeyset::Compile
005CF95C Module(sqlservr+001CF95C) CFetchComponent::smInitializeFetchComponent
005B786C Module(sqlservr+001B786C) CCursorDeclareStmt::Init
005BAA16 Module(sqlservr+001BAA16) CompileCursor
0060E7EC Module(sqlservr+0020E7EC) CCompPlan::FCompileStep

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RESOLUTION

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:

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

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

Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language. The English version of this fix should have the following file attributes or later:

   Date         Time       Version        Size               File name
   ---------------------------------------------------------------------

   08/11/2001   06:04 AM   8.00.0465.01   7,409,748 bytes   Sqlservr.exe

NOTE: Due to file dependencies, the most recent hotfix or feature that contains the preceding files may also contain additional files.

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WORKAROUND

To work around this problem, use a STATIC cursor instead of a FAST_FORWARD cursor.

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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.

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MORE INFORMATION

Several similar problems are also fixed, including cursors built on queries that contain DISTINCT, GROUP BY, HAVING, or aggregates (besides UNION) in conjunction with remote tables or in conjunction with projections of large objects (LOBs) columns (such as text, ntext and image).