FIX: Many ISNULLs Within an Expression May Cause Access Violation

This article was previously published under Q247134
This article has been archived. It is offered "as is" and will no longer be updated.
BUG #: 55405 (SQLBUG_70)
A T-SQL Query with an expression having many operands calling the ISNULL System Function may cause a handled Access Violation (AV) for the connection. The following error message occurs:
ODBC: Msg 0, Level 19, State 1[Microsoft][ODBC SQL Server Driver][SQL Server]SqlDumpExceptionHandler: Process 7 generated fatal exception c0000005 EXCEPTION_ACCESS_VIOLATION. SQL Server is terminating this process.

Connection Broken
Use the COALESCE System function instead of ISNULL.
Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 2 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
254561 INF: How to Obtain Service Pack 2 for Microsoft SQL Server 7.0 and Microsoft Data Engine (MSDE) 1.0
For more information, contact your primary support provider.
Both string and numeric expressions that have a lot of operands with calls to ISNULL may cause the Access Violation.
AV SELECT Access Violation Expression

Article ID: 247134 - Last Review: 10/22/2013 03:14:49 - Revision: 2.1

Microsoft SQL Server 7.0 Standard Edition

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