FIX: Parallel Query on Four CPUs Using NLS Is Slower Than Two CPUs

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Article ID: 282175 - View products that this article applies to.
This article was previously published under Q282175
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BUG #: 58078 (SQLBUG_70)
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SYMPTOMS

Parallel query performance on a computer with four CPUs is poorer than on a computer with two CPUs if you are using the National Language Support (NLS) sort order with the double-byte character set (DBCS).

You may encounter this problem if all of the following conditions are true:
  • You are using the NLS sort order with DBCS.
  • The query processor chooses the Parallelism physical operator.
  • The table has a column of character data type that is used by the Parallelism physical operator.

WORKAROUND

To work around this problem, do one of the following:
  • Use the binary sort order.

    -or-
  • Restrict the number of threads in parallel plan execution, by using the "max degree of parallelism" option or MAXDOP query hint.

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.

Properties

Article ID: 282175 - Last Review: October 21, 2013 - Revision: 2.1
APPLIES TO
  • Microsoft SQL Server 7.0 Standard Edition
Keywords: 
kbnosurvey kbarchive kbbug kbfix KB282175

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