The Internet Explorer Index.dat File in the History Folder May Become Very Large

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Article ID: 322916 - View products that this article applies to.
This article was previously published under Q322916
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SYMPTOMS

The Internet Explorer Index.dat file in the History folder may become very large over time.

CAUSE

The Index.dat file is never resized or deleted. Clearing the Internet Explorer history by clicking the Clear History button on the General tab in the Internet Options dialog box does not change the size of the Index.dat file. Also, setting the Days to keep pages in history value to 0 (zero) on the General tab does not change the size of the Index.dat file. The pre-allocated space in the Index.dat file increases Internet Explorer performance.

WORKAROUND

If the History folder becomes very large, it may cause reduced network performance if the folder is included as part of a roaming profile. A large History folder may also use a significant part of your profile quota. By default, the History folder is not included as part of a roaming profile in Microsoft Windows 2000 and Microsoft Windows XP. For additional information about how to exclude the History folder from roaming profiles in Microsoft Windows NT 4.0 and Microsoft Windows 98, click the article number below to view the article in the Microsoft Knowledge Base:
188692 How to Prevent Certain Folders from Uploading to Central Profile

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

MORE INFORMATION

This problem does not occur with the Temporary Internet Files folder.

Properties

Article ID: 322916 - Last Review: February 1, 2007 - Revision: 3.2
APPLIES TO
  • Microsoft Internet Explorer 5.5 Service Pack 1
  • Microsoft Internet Explorer 5.5 Service Pack 2
  • Microsoft Internet Explorer 5.01
  • Microsoft Internet Explorer 5.01
  • Microsoft Internet Explorer 5.0
  • Microsoft Internet Explorer 5.5 Service Pack 1
  • Microsoft Internet Explorer 5.5 Service Pack 2
  • Microsoft Internet Explorer 5.01
  • Microsoft Internet Explorer 5.01
  • Microsoft Internet Explorer 5.0
  • Microsoft Internet Explorer 5.5 Service Pack 1
  • Microsoft Internet Explorer 5.5 Service Pack 2
  • Microsoft Internet Explorer 5.01
  • Microsoft Internet Explorer 5.01
  • Microsoft Internet Explorer 5.0
  • Microsoft Internet Explorer 6.0, when used with:
    • Microsoft Windows XP Home Edition
    • Microsoft Windows XP Professional
    • Microsoft Windows XP Media Center Edition
    • Microsoft Windows XP Tablet PC Edition
    • Microsoft Windows XP Professional x64 Edition
    • Microsoft Windows 2000 Advanced Server
    • Microsoft Windows 2000 Datacenter Server
    • Microsoft Windows 2000 Professional Edition
    • Microsoft Windows 2000 Server
    • Microsoft Windows NT Server 4.0 Standard Edition
    • Microsoft Windows NT Server 4.0, Terminal Server Edition
    • Microsoft Windows NT Workstation 4.0 Developer Edition
    • Microsoft Windows 98 Standard Edition
Keywords: 
kbprb KB322916

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