> Todo:
> 
> 1. Compact log files after checkpoint (save records of uncommitted
>    transactions and remove/archive others).

On the grounds that undo is not guaranteed anyway (concurrent heap access),
why not simply forget it, since above sounds rather expensive ?
The downside would only be, that long running txn's cannot [easily] rollback
to savepoint.

> 2. Abort long running transactions.

This is imho "the" big downside of UNDO, and should not simply be put on 
the TODO without thorow research. I think it would be better to forget UNDO for long 
running transactions before aborting them.

Andreas

Tue, 22 May 2001 11:27:19 +0200
Zeugswetter Andreas SB  <ZeugswetterA@wien.spardat.at>
AW: AW: Plans for solving the VACUUM problem