> Yes, writes are only necessary when "too many dirty pages"
> are in the buffer pool. Those writes can be done by a page flusher
> on demand or during checkpoint (don't know if we need checkpoint,
> but you referred to doing checkpoints).
How else to know from where in log to start redo and how far go back
for undo ?
> > Currently records inserted by aborted transactions remain in db
> > untill vacuum. I try to rollback changes - ie *delete* inserted
> > tuples on abort (though could do not do this), - isn't there
> > some difference now?
>
> this has two sides: less space wastage, but slower rollback.
> What you state is a separate issue, and is not part of the
> startup rollforward for committed tx'ns. It is part of the rollback
> of aborted tx'ns.
And I've stated this as separate feature.
Vadim
