From: | Silvio Brandani <silvio(dot)brandani(at)tech(dot)sdb(dot)it> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-admin(at)postgresql(dot)org |
Subject: | Re: database not using indexes, yet |
Date: | 2011-11-18 15:03:58 |
Message-ID: | 4EC673DE.40201@tech.sdb.it |
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Thread: | |
Lists: | pgsql-admin |
Il 18/11/2011 15.51, Tom Lane ha scritto:
> Silvio Brandani<silvio(dot)brandani(at)tech(dot)sdb(dot)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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