[Zope-dev] GADFLY Database: Can it lose data if the Zope proc ess is aborted?

sean.upton@uniontrib.com sean.upton@uniontrib.com
Thu, 26 Jul 2001 11:43:49 -0700


Hmm, I think it stores everything to flat files on disk, but it can only
perform ops and has to keep the entire db in memory at run-time, which means
you mave some problems if you have a 1GB database, for example, in that (I
think) all the python processes' memory spaces running Zope would have to
contain all the Gadfly tables, unless some sort of shared memory setup was
used - either way, it's likely not ideal for anything larger than perhaps
some commonly used lookup tables, at least that is what I remember reading
at some point quite a long time ago...

Sean

-----Original Message-----
From: Andy McKay [mailto:andym@ActiveState.com]
Sent: Thursday, July 26, 2001 11:23 AM
To: Joachim Werner; zope-dev@zope.org
Subject: Re: [Zope-dev] GADFLY Database: Can it lose data if the Zope
process is aborted?


I thought gadfly didn't store data between restarts. Or am I losing it?

Cheers.
--
  Andy McKay.


----- Original Message -----
From: "Joachim Werner" <joe@iuveno-net.de>
To: <zope-dev@zope.org>
Sent: Thursday, July 26, 2001 11:17 AM
Subject: [Zope-dev] GADFLY Database: Can it lose data if the Zope process is
aborted?


> Hi!
>
> We have a very strange case of data loss: A client of us is using a Gadfly
> DB to store some news items. He reported that he lost a couple of his most
> recent data entries when we restarted our servers after applying the
latest
> Hotfix.
>
>  I know that Gadfly is not to be used for serious applications etc., but I
> thought that this was because of performance issues, not because it can
lose
> data. Has anybody had similar experiences? Our first tests say that Gadfly
> stores all INSERTs into the DB file right after they have been commited.
So
> the only explanation for data loss would be some strange caching that is
not
> always used ...
>
> Joachim
>
>
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