An application may experience slow performance if the application frequently uses binary string (BSTR) data types to manage large chunks of data on a Windows Server 2003-based computer

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Article ID: 937360 - View products that this article applies to.
Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows registry
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SYMPTOMS

On a Windows Server 2003-based computer, an application may experience slow performance. This behavior may occur if the application frequently uses binary string (BSTR) data types to manage large chunks of data. Additionally, the application consumes lots of memory in this situation.

Note The same application experiences no performance problems on a Windows 2000-based computer.

CAUSE

This problem occurs because of a design change in the BSTR cache settings in Windows Server 2003. In Microsoft Windows 2000, the maximum BSTR cache bucket size is 128 kilobytes (KB). In Windows Server 2003, the maximum BSTR cache bucket size is 32 KB. The BSTR cache settings cannot be configured either in Windows 2000 or in Windows Server 2003.

RESOLUTION

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk. After you apply this hotfix, you can adjust the BSTR cache settings in Windows Server 2003 to improve the performance of the application. For example, you can adjust the maximum size for the BSTR cache bucket to 128 KB. To do this, follow these steps:
  1. Click Start, point to Settings, and then click Control Panel.
  2. Double-click System.
  3. On the Advanced tab, click Environment Variables.
  4. Under System variables, click New.
  5. In the Variable name box, type OACACHEPARAMS.
  6. In the Variable value box, type an appropriate value, and then click OK.

    Note After you close the System item in Control Panel, you can use the following command to set the OACACHEPARAMS value:
    set OACACHEPARAMS=<Value>
    For more information about the value that you should use for the OACACHEPARAMS variable, see the "OACACHEPARAMS variable instructions" section.
  7. Click OK to close the Environment Variables dialog box.
  8. Click OK to close the System Properties dialog box.
  9. Restart the computer.

OACACHEPARAMS variable instructions

The variable value should use the following format:
<bucket3_max>,<bucket2_max>,<bucket1_max>,<bucket0_max>:<bucket_size_per_thread>
By default, the value of the OACACHEPARAMS variable is set to 32768,256,64,32:6. If you want to use the default value for a parameter, replace the parameter with 0 (zero). For example, you can run the following command at a command prompt:
set OACACHEPARAMS=16384,0,128,0:5
If you want to modify only the first few parameters, you can omit the other parameters. For example, if you want to change only the first two parameters, run the following command at a command prompt:
set OACACHEPARAMS=4096,2048
To set the maximum BSTR cache bucket size to 128 KB, run the following command at a command prompt:
set OACACHEPARAMS=131072,256,64,32:6

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must have Windows Server 2003 Service Pack 1 or Windows Server 2003 Service Pack 2 installed on the computer. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
889100 How to obtain the latest service pack for Windows Server 2003

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
Windows Server 2003 with Service Pack 1, x86-based versions
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File nameFile versionFile sizeDateTimePlatform
Oleaut32.dll5.2.3790.2993557,56818-Aug-200714:33x86
Windows Server 2003 with Service Pack 2, x86-based versions
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File nameFile versionFile sizeDateTimePlatform
Oleaut32.dll5.2.3790.4134553,98418-Aug-200714:51x86
Windows Server 2003 with Service Pack 1, Itanium-based versions
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File nameFile versionFile sizeDateTimePlatformSP requirementService branch
Oleaut32.dll5.2.3790.29933,936,76819-Aug-200705:50IA-64SP1Not applicable
Woleaut32.dll5.2.3790.2993557,56819-Aug-200705:50x86SP1WOW
Windows Server 2003 with Service Pack 2, Itanium-based versions
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatformSP requirementService branch
Oleaut32.dll5.2.3790.41343,943,42420-Aug-200702:10IA-64SP2Not applicable
Woleaut32.dll5.2.3790.4134553,98420-Aug-200702:10x86SP2WOW
Windows Server 2003, x64-based versions
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatformSP requirementService branch
Oleaut32.dll5.2.3790.29931,115,64819-Aug-200705:49x64SP1Not applicable
Woleaut32.dll5.2.3790.2993557,56819-Aug-200705:49x86SP1WOW
Windows Server 2003 with Service Pack 2, x64-based versions
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatformSP requirementService branch
Oleaut32.dll5.2.3790.41341,121,79220-Aug-200702:15x64SP2Not applicable
Woleaut32.dll5.2.3790.4134553,98420-Aug-200702:15x86SP2WOW

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

If the OANOCACHE environment variable is also defined, any setting for the OACACHEPARAMS variable is ignored. For more information about the OANOCACHE environment variable, click the following article number to view the article in the Microsoft Knowledge Base:
139071 FIX: OLE Automation BSTR caching will cause memory leak sources in Windows 2000
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Properties

Article ID: 937360 - Last Review: October 8, 2011 - Revision: 2.0
APPLIES TO
  • Microsoft Windows Server 2003, Standard Edition (32-bit x86)
  • Microsoft Windows Server 2003, Web Edition
  • Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
  • Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
  • Microsoft Windows Server 2003, Standard x64 Edition
  • Microsoft Windows Server 2003, Enterprise x64 Edition
  • Microsoft Windows Server 2003, Datacenter x64 Edition
  • Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
  • Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems
Keywords: 
kbautohotfix kbexpertiseinter kbwinserv2003postsp2fix kbbug kbfix kbqfe KB937360

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