From: Tom Lane <tgl@sss.pgh.pa.us>
To: Silvio Brandani <silvio.brandani@tech.sdb.it>
Cc: pgsql-admin@postgresql.org
Subject: Re: database not using indexes, yet
Date: Fri, 18 Nov 2011 09:51:16 -0500
Message-ID: <15583.1321627876@sss.pgh.pa.us> (raw)
In-Reply-To: <4EC66726.6060800@tech.sdb.it>
References: <4EBA9AAC.9030900@tech.sdb.it>
<4EC66726.6060800@tech.sdb.it>
Silvio Brandani <silvio.brandani@tech.sdb.it> writes:
> On postgres 8.3.11 on linux centos 5 we have a table not too big with
> primary key index on
> Indexes:
> "aida_references_pkey" PRIMARY KEY, btree (aida_reference_id)
> the query not use index:
> aidadb=# explain analyze select aida_reference_id from
> aida.aida_references where aida_reference_id = '3145';
> QUERY PLAN
> ----------------------------------------------------------------------------------------------------------------
> Seq Scan on aida_references (cost=0.00..51489.15 rows=1 width=4)
> (actual time=0.173..1457.643 rows=1 loops=1)
> Filter: (aida_reference_id = 3145)
> Total runtime: 1457.696 ms
There's nothing here to suggest that this query shouldn't use an index,
so the problem is in something you didn't show us. Maybe you have
enable_indexscan turned off, or maybe that index isn't really on that
table, or something else.
regards, tom lane
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To: pgsql-admin@postgresql.org
Cc: tgl@sss.pgh.pa.us, silvio.brandani@tech.sdb.it
Subject: Re: database not using indexes, yet
In-Reply-To: <15583.1321627876@sss.pgh.pa.us>
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