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From Mathieu Lecarme <>
Subject Re: Lucene index on relational data
Date Fri, 11 Apr 2008 08:08:54 GMT
Have a look at Compass 2.0M3

Your multiple index will be nice for massive write. In a classical 
read/write ratio, Compass will be much easier.


Rajesh parab a écrit :
> Hi,
> We are using Lucene 2.0 to index data stored inside
> relational database. Like any relational database, our
> database has quite a few one-to-one and one-to-many
> relationships. For example, let’s say an Object A has
> one-to-many relationship with Object X and Object Y.
> As we need to de-normalize relational data as
> key-value pairs before storing it inside Lucene index,
> we have de-normalized these relationships (Object X
> and Object Y) while building an index on Object A.
> We have large no of such object relationships and most
> of the times, the related objects are modified more
> frequently than the base objects. For example, in our
> above case, objects X and Y are updated in the system
> very frequently, whereas Object A is not updated that
> often. Still, we will need to update Object A entries
> inside the index, every time its related objects X
> and/or Y are modified.
> To avoid the above situation, we were thinking of
> having 2 separate indexes – first index will only
> index data of base objects (Object A in above example)
> and second index will contain data about its
> relationship objects (Object X and Y above), which are
> updated more frequently. This way, the more frequent
> updates to Object X and Y will only impact second
> index that stores relationship information and reduce
> the cost to re-index object A. However, I don’t think,
> MultiSearcher will be helpful if we want to search for
> data which spans across both indexes (e.g. some fields
> of Object A in first index and some fields of Object X
> or Y in second index).
> Do we have any option in Lucene to handle such
> scenario? Can we search across multiple indexes which
> have some relationships between them and search for
> fields that span across these indexes?
> Regards,
> Rajesh
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