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Re: Timestamp indexes

From: "Mitch Vincent" <mitch(at)venux(dot)net>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: <pgsql-sql(at)postgresql(dot)org>
Subject: Re: Timestamp indexes
Date: 2000-07-21 15:53:25
Message-ID: 007701bff32b$ce21d410$4100000a@doot (view raw or flat)
Thread:
Lists: pgsql-sql
select * from applicants as a where (a.created::date > '05-01-2000' or
a.resubmitted::date > '05-01-2000') order by (case when a.resubmitted >
a.created then a.resubmitted else a.created end) desc limit 10 offset 0

There is one of the queries.. I just remembered that the order by was added
since last time I checked it's PLAN (in the 6.5.X days) -- could that be the
problem?

8784 records in the applicant database.

created and resubmitted are both timestamps.

NOTICE:  QUERY PLAN:

Sort  (cost=2011.65..2011.65 rows=4880 width=611)
  ->  Seq Scan on applicants a  (cost=0.00..1712.68 rows=4880 width=611)

ProcessQuery
! system usage stats:
!       7.489270 elapsed 5.609119 user 1.730936 system sec
!       [5.618921 user 1.750540 sys total]
!       1/546 [1/546] filesystem blocks in/out
!       0/9287 [0/9496] page faults/reclaims, 0 [0] swaps
!       0 [0] signals rcvd, 0/3 [3/6] messages rcvd/sent
!       7/102 [10/105] voluntary/involuntary context switches
! postgres usage stats:
!       Shared blocks:          0 read,          0 written, buffer hit rate
= 100.00%
!       Local  blocks:          0 read,          0 written, buffer hit rate
= 0.00%
!       Direct blocks:          0 read,          0 written
CommitTransactionCommand

Thanks Tom!


-Mitch




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