Re: Modify performance

[Ugen <ugen@xonix.com>]

Cannot upgrade but thanx for the pointer - i will start digging :)

However i am still wondering why is there such a significant
difference in performance between add and modify?
Isn't addition of a new entry also causing indexes to be rebuilt?
If so - how is that different from the modify in it's handling of indexes?
--Ugen

Howard Chu wrote:

> Upgrade to OpenLDAP 2.1 and use back-bdb. You probably have indexing enabled
> for several attributes. In OpenLDAP 2.0, on any modify, all attribute indices
> for the entry are recomputed, even if most of those attributes are unchanged.
> This generates enough churn that even with dbnosync, the page cache for the
> database fills up quickly with dirty pages and needs to be flushed. In
> OpenLDAP 2.1 back-bdb, only the indices of modified attributes are updated,
> so much less I/O traffic is generated.
>
>  -- Howard Chu
>  Chief Architect, Symas Corp.       Director, Highland Sun
>  http://www.symas.com               http://highlandsun.com/hyc
>  Symas: Premier OpenSource Development and Support
>
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>
> >    
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