Re: database not using indexes, yet

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От Silvio Brandani
Тема Re: database not using indexes, yet
Дата
Msg-id 4EC673DE.40201@tech.sdb.it
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Ответ на Re: database not using indexes, yet  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: database not using indexes, yet  (Tom Lane <tgl@sss.pgh.pa.us>)
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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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