AW: AW: [HACKERS] Plans for solving the VACUUM problem

[Zeugswetter Andreas SB]

> - A simple typo in psql can currently cause a forced rollback of the entire
> TX. UNDO should avoid this.

Yes, I forgot to mention this very big advantage, but undo is not the only possible 
way 
to implement savepoints. Solutions using CommandCounter have been discussed.
Although the pg_log mechanism would become more complex, a background
"vacuum-like" process could put highest priority on removing such rolled back parts
of transactions.

Andreas

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