Hi:
The point to catch with bad performance during merging a database
result is to reduce the number of rows visited by your first query.
As an example take a look a these two queries using Lucene Domain
Index, the two are equivalents:
Option A:
select * from (select rownum as ntop_pos,q.* fro
I would suggest you try LuSql, which was designed specifically to
index relational databases into Lucene.
It has an extensive user manual/tutorial which has some complex
examples involving multi-joins and sub-queries.
I am the author of LuSql.
LuSql home page:
http://lab.cisti-icist.nrc-cnrc.gc.c
I think the message is don't even try unless you're explored the
alternatives and found them inadequate.
Best
Erick
On Sun, Mar 1, 2009 at 2:19 AM, wrote:
> > Yes. DBSight helps to flatten database objects into Lucene's
> > documents.
>
> OK, thx for the advice.
>
> But back to my original ques
> Yes. DBSight helps to flatten database objects into Lucene's
> documents.
OK, thx for the advice.
But back to my original question.
When I have to merge both resultsets, what is the best approach to do this?
-
To unsubscrib
Yes. DBSight helps to flatten database objects into Lucene's documents. It's
more like Lucene-On-Rails. Custom crawler is supported via java api to crawl
outside database. DBSight query syntax and Lucene query syntax are both
supported, in addition to customizable analyzer, similarity, ranking, etc
> Actually you can use DBSight(disclaimer:I work on it) to
> collect the data
> and keep them in sync.
Hm... it fulltext-indexes a database?
It supports document content outside the database (custom crawler)?
What query-syntax it supports?
--
Actually you can use DBSight(disclaimer:I work on it) to collect the data
and keep them in sync.
The free version has most the features and doesn't have size limit.
--
Chris Lu
-
Instant Scalable Full-Text Search On Any Database/Application
site: http://www.dbsight.net
dem
> Contrariwise, look for anything by Marcelo Ochoa on the user list
> about embedding Lucene in Oracle (which I confess I haven't looked
> into at all, but seems interesting).
I know this lucene-oracle text cartridge.
But my solution has to work with any of the big databases (MS, IBM, Oracle).
-
> I feel this may not be a good example.
It was a very simple example.
The real database query is very complex and joins serveral tables.
It would be an absolute nightmare to copy all these tables into lucene and
keep both in sync.
I'll second Chris's comment and ask whether you've considered
denormalizing your data into Lucene and sticking exclusively
with Lucene?
Contrariwise, look for anything by Marcelo Ochoa on the user list
about embedding Lucene in Oracle (which I confess I haven't looked
into at all, but seems intere
I feel this may not be a good example. Since you can easily index field c,
a, d and let Lucene to handle the filter "c = 'foo'" and the order by
clause"order by a desc, d"
--
Chris Lu
-
Instant Scalable Full-Text Search On Any Database/Application
site: http://www.dbsight.
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