From: | Christopher Zach <zach(at)icg(dot)tu-graz(dot)ac(dot)at> |
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To: | pgsql-general(at)postgresql(dot)org |
Subject: | rtree index very large |
Date: | 2001-06-12 15:17:20 |
Message-ID: | 01061211172000.15471@fcggpc47.icg.tu-graz.ac.at |
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Lists: | pgsql-general |
Hi,
I've inserted 100000 random boxes into a table (page file size about 8M) and
created a rtree index on it. Indexing needed a few minutes and finally I got
a 200MB page file for the index. Can someone explain this to me?
BTW: I did the same with Oracle 8i Spatial and the index seems to be a
lot smaller. Selection time for geometric queries (non-empty
intersection with a box) is roughly the same - a few seconds for both
2DBMS, but I don't have exact statistics.
I can guess a possible explanation for the smaller index in Oracle:
coordinates are rounded according the given accuracy, which could result
in smaller rtrees, but this is just a guess.
regards,
Christopher
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