BUG: SQL-DMO::EnumQueuedTasks May Cause Memory Leak

ID: Q193390

The information in this article applies to:
BUG #: 18128 (SQLBUG_65)

SYMPTOMS

The SQL Distributed Management Objects (SQL-DMO) Executive object's EnumQueuedTasks method is used to enumerate running tasks on SQL Server. SQL Server and SQL Executive may leak 4 KB of memory each time the EnumQueuedTasks method is invoked. SQL Enterprise Manager invokes this method when the Refresh button is pressed in the Current Activity window.

Over an extended period time, this may cause adverse memory effects on the server computer.


CAUSE

The SQL Server and SQL Executive services exchange task information by means of a shared memory area. The action of sharing the information is not properly releasing all allocated memory.


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: 

   File name     Platform
   ----------------------

   Sql447i.exe   Intel
   Sql447a.exe   Alpha
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 6.5.


MORE INFORMATION

You can confirm that the memory leak is occurring by watching the Windows NT performance counters.

Use Windows NT Performance Monitor to watch the Virtual Bytes counter for the SQL Server (Sqlservr.exe) and SQL Executive (Sqlexec.exe) processes.

Additional query words: SEM 4K slow hang hangs perfmon sqldmo dist obj 


Keywords          : SSrvDMO kbbug6.50 
Version           : WINDOWS:6.5; winnt:6.5
Platform          : WINDOWS winnt 
Issue type        : kbbug

Last Reviewed: July 2, 1999