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From: kilin@cs.UMD.EDU
To: postgres@postgres.Berkeley.EDU
Subject: Question on R-trees
Date: Thu, 15 Dec 1994 10:22:34 -0500
Message-ID: <199412151522.KAA05411@twinkie.cs.UMD.EDU> (raw)


Hi,

Got a couple of questions on R-trees on Postgres:

Suppose I have a relation and index defined as :

create rel1 (code = int4, bound = box)\g
define index rel1ind on rel1 using rtree (bound box_ops)\g

(1) Does it mean that everytime I query using the box operation (like <<, &<
    etc.) the Rtree will be used to access the tuples? Can I force the
    system to use the Rtree?

(2) Will the output be ordered in anyway beacuase of the use of the index?
    I try to run a couple of querys and the output is ordered as the order
    of inputting them. Is it supposed to be that way?

(3) (A dumb question), for the box datatype, is a box constant specified
    by : "(xlow, ylow, xhigh, yhigh)"::box ?

Thanks a lot

David Lin

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