AW: [HACKERS] Plans for solving the VACUUM problem

[Zeugswetter Andreas SB]

> >If community will not like UNDO then I'll probably try to implement
> >dead space collector which will read log files and so on. 
> 
> I'd vote for UNDO; in terms of usability & friendliness it's a big win.

Could you please try it a little more verbose ? I am very interested in 
the advantages you see in "UNDO for rollback only".

pg_log is a very big argument, but couldn't we try to change the format
to something that only stores ranges of aborted txn's in a btree like format ? 
Now that we have WAL, that should be possible.

Andreas

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