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Subject: RE: [ActiveDir] Schema changes for AD2008 (indexing objectclass)

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04/13/2009 11:58 AM
objectclass is hardcoded into the list of indexes for Windows Server 2008 whether the schema is marked to have it indexed or not. Go ahead and modify the schema to say it is indexed so your behavior is consistent between DCs. Actually I think I have been telling people to index objectclass for perf reasons since probably around August 2000 or so. It was a mistake that it wasn't indexed in the original release of Windows 2000 IMO and I have heard that it was due to issues originally with AD where indexing non-unique multivalued attributes was problematic. If DonH sees this thread, I am certain he could give the authoritative answer on what happened there. joe -- O'Reilly Active Directory Fourth Edition - http://www.joeware.net/win/ad4e.htm _____ From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of Brown, Ken F. Sent: Monday, April 13, 2009 9:07 AM To: ActiveDir@mail.activedir.org Subject: [ActiveDir] Schema changes for AD2008 As part of the planning to upgrade to 2008 AD (from 2000) - I was asked to mark the following schema attribute as 'indexed in AD' (in a different Win2K forest being used by some internal dev folks - they did mark it as being indexed and it improved their search performance - but they also search the 'production' NOS forest with all the users and it causes their app/searching to be much slower - but there is also an order of magnitude difference in the number of users between the forests): Object-Class The following article has it documented as not being indexed in AD until Windows 2008: http://msdn.microsoft.com/en-us/library/ms679012(VS.85).aspx In my testing, after extending the schema for 2008 - the attribute is still not marked as being indexed in AD (although a fresh install of 2008 AD (not an upgrade) has it being marked as indexed in AD). So I've thought of a couple of questions around that - perhaps others may know the answer (before I go back and ask our MS TAM): 1. Is there a reason to not mark it as being indexed (via the schema MMC) when I go-live in production? 2. Are there other attributes that need to be changed in a similar nature (either indexed in AD, marked to be replicated to the GC, etc) (is there a list?) >From a #1 perspective - I'm wondering if there are other...dependencies...on other AD attributes that could us issues (say that specific attribute is manually marked to be indexed - but there should be a related attribute that should be indexed, also). I wouldn't think so - other than the size of NTDS.DIT growing (I'm assuming that indexing attributes makes NTDS.DIT grow). Performance wise, since the attribute(s) are not indexed, we have essentially a worse-case performance in accessing those attributes. Going to 2008 (64 bit) should give us better performance - and marking it (or them) as being indexed in AD should only give better performance. Any other thoughts or answers? Thanks!

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Forums >ActiveDir Mail List Archive >List Archives > RE: [ActiveDir] Schema changes for AD2008 (indexing objectclass)

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