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[Fwd: Re: When to use Berkeley transactions.]

From: Glenn A. Thompson <gthompson_at_cdr.net>
Date: 2003-02-21 06:26:37 CET

  Man,
I did it twice.

I'd like to nail down just whch level of isolation is *really* required.
Being an Oracle sorta person, I think "repeatable read" by default.
Umm not sure if this adds anything but I will post more on this thread
later.

gat

Hi Glenn! I think you meant to send this to dev, not just me...

"Glenn A. Thompson" writes:
> Hey,
> I agree overall with Karl here. Subversion needs transactions; if not
> completely today, it will tomorrow as features are added.
> Transactions however, can have varying levels of isolation depending
> on the DB and/or transaction specific settings.
> SQL DB's often support many different levels of isolation. It can get
> quite tricky. Deadlocks are only one of at least 4 different
> isolation problems that can present themselves. Which level of
> isolation is required is something I'm still not fully
> re-understanding with respect to Subversion. Full isolation
> (Serializable) is safest but brutally slow.
>
> I have to run. But I will elaborate on it later. I also need to go
> double check BDBs implemention. I seem to have spaced it:-)
>
> Later,
> gat

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Received on Fri Feb 21 06:27:13 2003

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