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jaimelima@al.uap.edu.ar wrote:
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> Mensaje citado por Hans-Juergen Schoenig <postgres@cybertec.at>:
>
>
>> hello ...
>>
>> i guess there is no formal proposal yet but there are some ideas
>> around and some major challenges have been discussed already.
>> i think simon riggs was planning to work on it in the future.
>> the basic idea here is to have the option to create a "snapshot"
>> which then stays in the database. the main challenge is that PostgreSQL
>> should not keep all version of a row since the snapshot but VACUUM
>> should be able to clean out all rows which are not seen by any
>> snapshot or any ongoing transaction.
>> this should be a quite fancy solution which is quite space efficient.
>>
>> internally we had the idea of tweaking VACUUM a little:
>>
>> VACUUM BEFORE timestamp;
>> and ...
>> SET current_snapshot TO '2007-10-10 ...';
>>
>> this would allow a queries to use any snapshot after the timestamp
>> defined by VACUUM (if data is around).
>> the downside here: you might potentially eat up more space.
>> flashback data should be read only, of course.
>>
>> best regards,
>>
>> hans
>>
>>
>>
>> On Oct 31, 2007, at 11:31 AM, Gokulakannan Somasundaram wrote:
>>
>>
>>> Hi,
>>> I went through the mailing list and couldn't get answer to the
>>> question.
>>>
>>> a) Is there a proposal in place for going back in time within a
>>> transaction?
>>>
>>>
>>>
>>> --
>>> Thanks,
>>> Gokul.
>>> CertoSQL Project,
>>> Allied Solution Groups.
>>> (www.alliedgroups.com)
>>>
>>
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>> Tel: +43/1/205 10 35 / 340
>> www.postgresql.at, www.cybertec.at
>>
>>
>>
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