From: | Philip Warner <pjw(at)rhyme(dot)com(dot)au> |
---|---|
To: | Zeugswetter Andreas SB <ZeugswetterA(at)wien(dot)spardat(dot)at>, "Mikheev, Vadim" <vmikheev(at)SECTORBASE(dot)COM>, "'Bruce Momjian'" <pgman(at)candle(dot)pha(dot)pa(dot)us> |
Cc: | The Hermit Hacker <scrappy(at)hub(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: AW: Plans for solving the VACUUM problem |
Date: | 2001-05-23 10:43:24 |
Message-ID: | 3.0.5.32.20010523204324.02bd14b0@mail.rhyme.com.au |
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Lists: | pgsql-hackers |
At 11:25 23/05/01 +0200, Zeugswetter Andreas SB wrote:
>
>> >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".
I have not been paying strict attention to this thread, so it may have
wandered into a narrower band than I think we are in, but my understanding
is that UNDO is required for partial rollback in the case of failed
commands withing a single TX. Specifically,
- A simple typo in psql can currently cause a forced rollback of the entire
TX. UNDO should avoid this.
- It is not uncommon for application in other databases to handle errors
from the database (eg. missing FKs), and continue a TX.
- Similarly, when we get a new error reporting system, general constraint
(or other) failures should be able to be handled in one TX.
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