Article ID: 277738
Article Last Modified on 3/14/2006
APPLIES TO
- Microsoft SQL Server 7.0 Standard Edition
This article was previously published under Q277738
BUG #: 58334 (SQLBUG_70)
SYMPTOMS
A query with aggregations may return incorrect results when a parallel query plan is chosen to do the aggregations. The following example shows part of a simplified parallel query plan chosen to do aggregations:
|--Stream Aggregate(GROUP BY:(...) ...)
|--Parallelism(Gather Streams)
|--Stream Aggregate(GROUP BY:(...) ...)
|--Bookmark Lookup(BOOKMARK:([Bmk1000]), OBJECT:(...) ...)
|--Parallelism(Distribute Streams)
WORKAROUND
You can work around this problem in the following ways:
Disable parallel plan generation globally for the entire server by setting the max degree of parallelism option to 1 through the sp_configure system stored procedure.
NOTE: To disable parallel plan generation through sp_configure, you must enable the show advanced options configuration setting:sp_configure 'show advanced options', 1 reconfigure with override go sp_configure 'max degree of parallelism', 1 reconfigure with override go-or-
- Disable the creation of a parallel plan by using the OPTION (MAXDOP 1) query hint for the statement that is experiencing the problem.
STATUS
Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 3 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
274799 INF: How to Obtain Service Pack 3 for Microsoft SQL Server 7.0 and Microsoft Data Engine (MSDE) 1.0
For more information, contact your primary support provider.
Additional query words: max dop, Incorrect results
Keywords: kbbug kbfix KB277738
