You read the doc about archiving and pitr.
2011/2/15, Emi Lu <emilu@encs.concordia.ca>:
>
>> Start from vacuum feature information from PGSQL helps documentation, it
>> telling me that Postgresql didn’t delete data permanently when we
>> execute delete command, it just made the data invalid. By following this
>> email archive :
>>
>> http://archives.postgresql.org/pgsql-admin/2005-01/msg00176.php
>>
>> I could get the table files, my question is, how could I read again the
>> deleted record from that files.
>
> I am interested to know it as well.
>
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> Lu Ying
>
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pasman