>> My imagination is probably not as good, but if you at time A wallog the
>> complete map and at A+1 you update a tuple so the visibility bit is cleared
>> but the map bit change does not happen due to a crash. Then at wal replay
>> time you restore the map from time A and if the tuple change a
Den 4 Dec 2010 kl. 08:48 skrev Heikki Linnakangas
:
> On 04.12.2010 09:14, jes...@krogh.cc wrote:
>> There has been a lot discussion about index-only scans and how to make the
>> visibillity map crash safe. Then followed by a good discussion about hint
>> bits.
>>
&
There has been a lot discussion about index-only scans and how to make the
visibillity map crash safe. Then followed by a good discussion about hint bits.
What seems to be the main concern is the added wal volume and it makes me
wonder if there is a way in-between that looks more like hint bits.
