From: Silvio Brandani <silvio.brandani@tech.sdb.it>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-admin@postgresql.org
Subject: Re: database not using indexes, yet
Date: Fri, 18 Nov 2011 16:03:58 +0100
Message-ID: <4EC673DE.40201@tech.sdb.it> (raw)
In-Reply-To: <15583.1321627876@sss.pgh.pa.us>
References: <4EBA9AAC.9030900@tech.sdb.it>
<4EC66726.6060800@tech.sdb.it>
<15583.1321627876@sss.pgh.pa.us>
Il 18/11/2011 15.51, Tom Lane ha scritto:
> 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
>
this is not the case, to be sure I have recreated the index and still
not work. moreover the copy of the table with the same ttpe of index is
using it.
I have vacuum full the table and still not work, how can I rebuild this
table ? this is a production database..
thanks
--
Silvio Brandani
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To: pgsql-admin@postgresql.org
Cc: silvio.brandani@tech.sdb.it, tgl@sss.pgh.pa.us
Subject: Re: database not using indexes, yet
In-Reply-To: <4EC673DE.40201@tech.sdb.it>
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