FIX: SQL 7.0 Slower than SQL 6.5 on UNIONed Left Outer Join and View

ID: Q244446

The information in this article applies to:

Microsoft SQL Server version 7.0

BUG #: 56423 (SQLBUG_70)

SYMPTOMS

Occasionally, SQL Server 7.0 may be slower than SQL 6.5 when you use the following specific query type:

Multiple UNIONed left outer joins that involve a view.

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next SQL Server service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

The English version of this fix should have the following file attributes or later:


   Date         Time     Size         File name     Platform
   ----------------------------------------------------------

   10/04/1999   02:17p   15,743,163   S70733A.exe   Alpha
   10/04/1999   01:54p    9,444,774   S70733I.exe   Intel

To achieve the full benefit of this hotfix it may be necessary to rephrase the query by joining groups of tables within parenthesis, then joining that group to a second group of joined tables and views within parenthesis.

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

NOTE: If this product was already installed on your computer when you purchased it from the Original Equipment Manufacturer (OEM) and you need this fix, please call the Pay Per Incident number listed on the above Web site. If you contact Microsoft to obtain this fix, and if it is determined that you only require the fix you requested, no fee will be charged. However, if you request additional technical support, and if your no-charge technical support period has expired, or if you are not eligible for standard no-charge technical support, you may be charged a non-refundable fee.

For more information about eligibility for no-charge technical support, see the following article in the Microsoft Knowledge Base:

Q154871 Determining If You Are Eligible for No-Charge Technical Support

STATUS

Microsoft has confirmed this to be a problem in SQL Server version 7.0.

Additional query words:

Keywords : kbbug7.00 kbSQLServ700bug
Version : winnt:7.0
Platform : winnt
Issue type : kbbug