> Yes, this is very important question...
>
> In original postgres there was dedicated vacuum process...
> Vacuuming without human administration is possible but
> in any case commit in non-overwriting system requires
> ~2 data block writes (first - to write changes, second - to
> write updated xmin/xmax statuses). In WAL systems only
> 1 data block write required...
>
> Ok, we have to decide two issues about what would we like
> to use in future:
>
> 1. type of storage manager/transaction system -
>
> WAL or non-overwriting.
Can you explain WAL. I understand locking vs. multi-version.
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