RE: Are journal's UB & UP entries guaranteed to be in 1-2 sequenc e?

Jim,

True. The point of the last post was simply that the logic didn't hold.

-Walden

------------
Walden H Leverich III
President
Tech Software
(516) 627-3800 x11
(208) 692-3308 eFax
WaldenL@xxxxxxxxxxxxxxx
http://www.TechSoftInc.com 

Quiquid latine dictum sit altum viditur.
(Whatever is said in Latin seems profound.)
 

-----Original Message-----
From: Jim Franz [mailto:franz400@xxxxxxxxxxxx] 
Sent: Friday, September 05, 2003 12:21 PM
To: Midrange Systems Technical Discussion
Subject: Re: Are journal's UB & UP entries guaranteed to be in 1-2 sequenc
e?


all they would need is to get two journal sequence numbers within
a single lock. what would be hard about that?
jim
----- Original Message -----
From: "Walden H. Leverich III" <WaldenL@xxxxxxxxxxxxxxx>
To: "'Midrange Systems Technical Discussion'" <midrange-l@xxxxxxxxxxxx>
Sent: Friday, September 05, 2003 12:09 PM
Subject: RE: Are journal's UB & UP entries guaranteed to be in 1-2 sequenc
e?


> >journal entries are written before the write/update to the file
> >- this assures that things can be rebuilt from journal in the
> >event of failure. So this would support Al's information, I
> >think.
>
> Nope, I have to disagree that this supports Al's information. Think of it
> this way, I have to deposit money into a bank before I withdraw it[1], and
> so to you. That is:
>
> Walden - Deposit
> Walden - Withdraw
> Vern - Deposit
> Vern - Withdraw
>
> It can never be:
> Walden - Withdraw
> Walden - Deposit
>
>
> However, it can be
>
> Walden - Deposit
> Vern - Deposit
> Vern - Withdraw
> Walden - Withdraw
>
> And I believe this is the exact scenerio that the original poster was
> worried about.
>
> -Walden
>
> [1] - I'm ignoring overdraft protection, monies already in the account,
> margin accounts, etc. You get the point.
>
> ------------
> Walden H Leverich III
> President
> Tech Software
> (516) 627-3800 x11
> (208) 692-3308 eFax
> WaldenL@xxxxxxxxxxxxxxx
> http://www.TechSoftInc.com
>
> Quiquid latine dictum sit altum viditur.
> (Whatever is said in Latin seems profound.)
>
>
> -----Original Message-----
> From: Vern Hamberg [mailto:vhamberg@xxxxxxxxxxxxxxxxxxxxxxxxx]
> Sent: Friday, September 05, 2003 11:28 AM
> To: Midrange Systems Technical Discussion
> Subject: Re: Are journal's UB & UP entries guaranteed to be in 1-2
sequence?
>
>
> We were discussing journals yesterday - journal entries are written before
> the write/update to the file - this assures that things can be rebuilt
from
> journal in the event of failure. So this would support Al's information, I
> think.
>
> Vern
>
> At 10:35 AM 9/5/2003 -0400, you wrote:
> >I asked, and was given the assurance that it was so.
> >
> >Al
> >
> >Even though you are Al <g>, is that documented anywhere?
> >
> >GA
>
>
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