Microsoft KB Archive/224581

= FIX: Very Large Numbers of Predicates AND-ed Together May Cause Stack Overflow =

Article ID: 224581

Article Last Modified on 3/14/2006

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APPLIES TO


 * Microsoft SQL Server 7.0 Standard Edition

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This article was previously published under Q224581



BUG #: 54366 (SQLBUG_70)



SYMPTOMS
A query that contains a large number of predicates that are AND-ed together may cause a stack overflow exception. Several thousand conditions are typically required for this problem to occur, and you may reach a limit on the maximum batch size of your query tool before encountering this situation. Many query tools limit batches to 128 KB, whereas SQL Server 7.0 now accepts a batch size as large as (65536 * ).



CAUSE
During optimization, memory for selectivity calculation was being allocated from the stack. This allocation depends on the number of nodes being AND-ed together and can result in a stack overflow.



WORKAROUND
To work around this problem, rewrite the query to reduce the number of AND conditions required. For example, you may be able to rewrite the query as a join.



STATUS
Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 1 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

232570INF: How to Obtain Service Pack 1 for Microsoft SQL Server 7.0 and Microsoft Data Engine (MSDE) 1.0

For more information, contact your primary support provider.



MORE INFORMATION
The SQL Server error log will contain an entry similar to the following when the exception occurs:

1999-04-01 16:22:13.78 spid7   04/01/99 16:22:13 Stack Overflow Dump not possible - Exception c00000fd E at 780348a4 1999-04-01 16:22:13.78 spid7   Address=780348a4 Exception Code = c00000fd 1999-04-01 16:22:13.78 spid7   eax=00000008 ebx=000d6558 ecx=00000008 edx=7804093a 1999-04-01 16:22:13.78 spid7   esi=00000001 edi=00000000 eip=780348a4 esp=02f82f38 1999-04-01 16:22:13.78 spid7   ebp=02f83208 efl=00010203 1999-04-01 16:22:13.78 spid7   cs=1b ss=23 ds=23 es=23 fs=3b gs=0 1999-04-01 16:22:13.78 spid7   Input Buffer 393228 bytes - ... ... 1999-04-01 16:22:31.64 spid7   Error: 0, Severity: 19, State: 0 1999-04-01 16:22:31.64 spid7   language_exec: Process 7 generated an access violation. SQL Server is terminating this process.

Additional query words: EXCEPTION_STACK_OVERFLOW language_exec ANDed errorlog error err message msg

Keywords: kbbug kbfix kbqfe KB224581

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