| From: | Zeugswetter Andreas SB <ZeugswetterA(at)wien(dot)spardat(dot)at> |
|---|---|
| To: | Zeugswetter Andreas SB <ZeugswetterA(at)wien(dot)spardat(dot)at>, "'Mikheev, Vadim'" <vmikheev(at)SECTORBASE(dot)COM>, "'Tom Lane'" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Thomas Lockhart <lockhart(at)alumni(dot)caltech(dot)edu>, Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, Peter Eisentraut <peter_e(at)gmx(dot)net>, Jan Wieck <JanWieck(at)Yahoo(dot)com>, Hiroshi Inoue <Inoue(at)tpf(dot)co(dot)jp>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, "Ross J(dot) Reedstrom" <reedstrm(at)rice(dot)edu> |
| Subject: | AW: Big 7.1 open items |
| Date: | 2000-06-26 12:01:15 |
| Message-ID: | 219F68D65015D011A8E000006F8590C605BA5994@sdexcsrv1.f000.d0188.sd.spardat.at |
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| Lists: | pgsql-hackers |
I wrote:
> Vadim wrote:
> > Impossible to recover anyway - pg_control keeps last
> > checkpoint pointer, required for recovery.
>
> Why not put this info in the tx log itself.
>
> > That's why Oracle recommends (requires?) at least
> > two copies of control file ....
>
> This is one of the most stupid design issues Oracle has.
The problem is, that if you want to switch to a no fsync environment,
(here I also mean the tx log)
but the possibility of losing a write is still there, you cannot sync
writes to two or more different files. Only one file, the tx log itself is
allowed
to carry lastminute information.
Thus you need to txlog changes to pg_control also.
Andreas
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