Microsoft KB Archive/304228

= XADM: Search Causes High Information Store CPU Utilization =

Article ID: 304228

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 2000 Service Pack 1

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This article was previously published under Q304228



SYMPTOMS
The Microsoft Exchange 2000 Information Store (IS) reaches high utilization of the central processing unit (CPU) for an hour or more.



CAUSE
This behavior occurs when you perform an HTTP DAV SEARCH that contains a very large number (such as a million) of unique column names.



RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Microsoft Exchange 2000 Server service pack that contains this hotfix.

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 about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

In this update, the maximum number of column names for a SEARCH has been changed to 1024.

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

Component:

NOTE: Due to file dependencies, this update requires Microsoft Exchange Server 2000 Service Pack 1.



STATUS
Microsoft has confirmed that this is a problem in Microsoft Exchange 2000 Server.



Sample Callstack for Information Store
ChildEBP RetAddr Args to Child 0fa2f094 5f86b13b 0fa2f0fc 00000000 77e88ab4 EXOLEDB!_chkstk+0x17 0fa2f0b4 5f86adb1 0fa2f0fc 00000000 03df0410 EXOLEDB!ScDispatchRequest+0x277 0fa2feb4 5f8ef643 113f0008 5f9b8183 113f0008 EXOLEDB!CDavServer__ProcessItem+0xa9 0fa2febc 5f9b8183 113f0008 03d65bf4 03df0410 EXOLEDB! CEpoxyStreamUnpacker__ProcessUnpackedStream+0xa 0fa2fee8 5f8ef5f2 5f86ac13 05f90040 03d65bf0 EXOLEDB!IEpoxyStreamUnpacker__ScUnpackStreamBuffer+0x13a 0fa2ff00 62f26c03 03d65bf4 00000046 01d65b4d EXOLEDB!CDavServer__HrEpoxyReqHandler+0x76 0fa2ff28 62f268fe 00000046 00000001 00000000 EPOXY!CEpoxyQ__DispatchRequest+0x98 00000002 0000012b 00000070 62f2e37c 00000000 EPOXY!CEpoxyQ__IOCPNotification+0x16c

Keywords: kbbug kbexchange2000presp2fix kbfix kbqfe KB304228

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