Re: RE: oracle or mssql

Any database engine that offers dirty-reads as an "option" is doing so because it hasn't perfected the ability to avoid them.

The dust settled on this issue over a decade ago. Check out Gray and Reuter "Transaction Processing: Concepts and Techniques" (ISBN: 1558601902 - it'll be in any college library) and read the section on the ACID properties, especially the sections on "C" for "consistency" and "I" for "isolation"...

Oracle is doing the best thing. It supplies "statement-level read-consistency" by default. The ACID properties advise "transaction-level read-consistency" and Oracle offers that option, but it is not advisable to use it unless you are using a transaction-processing monitor besides...

Thousand-to-one odds are awful. You can run across the "exception" millions of times per day. 90% of all coding is created to deal with 10% or less of the possible situations...

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Wednesday, October 30, 2002 9:54 AM

> I would like to point out that what you call "dirty reads" are mostly
> the correct reads. Oracle method IS the dirty read.
>
> I am sure that your users does at least 1000 commits to every rollback.
> So when oracle gives you the data it already knows that this data is
> wrong. If you do the query again a minute later you will get new results
> that were available when you did the original query but were committed
> later. So you get a 1000/1 chance to get incorrect data.
>
> The "dirty read" method, on the other hand, gives you the current values,
> believing that they will be committed in a moment. So you get 1/1000
chance
> to get wrong data.
>
> Which odds will you bet on?
>
> Yechiel Adar
> Mehish
> ----- Original Message -----
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Sent: Tuesday, October 29, 2002 2:18 PM
>
>
> List,
> I'm always keen to refresh on database comparisons so thanks for
> everyone's pointers.
>
> I'm surprised Oracle doesn't make more of an issue about their locking and
> concurrency methods (i.e. redo/rollback/undo).
>
> MSSQL seems to deal with it in two ways:
> Default: readers and writers prevent writers from accessing data until
they
> are finished with it!
> Other method: no control, you just get dirty reads!
>
> Anyone got anything to add to this? Or am I wrong?
>
> - Mike.
>
>
> -----Original Message-----
> Sent: 24 October 2002 17:29
> To: Multiple recipients of list ORACLE-L
>
>
> As I said, use mssql ONLY if your boss is willing to be strapped into a
> MicroSlop only platform. If he's even remotely thinking of using a
> different OS
> then you can't use mssql.
>
> Dick Goulet
>
> ____________________Reply Separator____________________
> Author: GKor_at_rdw.nl
> Date: 10/23/2002 11:48 PM
>
> goodmorning
> everybody who responded to my basic question : thanks
>
> summary
>
> professional : use oracle enterprise edition
> semi professional : use oracle standard edition / mssql enterprise edition
> in all other cases mssql standard edition
>
>
>
> > -----Oorspronkelijk bericht-----
> > Van: Mohammad Rafiq [SMTP:rafiq9857_at_hotmail.com]
> > Verzonden: woensdag 23 oktober 2002 20:51
> > Aan: Multiple recipients of list ORACLE-L
> > Onderwerp: RE: oracle or mssql
> >
> > Xenix is history now...SCO itself stopped it sometime in 1990
> >
> >
> >
> >
> >
> >
> > Reply-To: ORACLE-L_at_fatcity.com
> > To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > Date: Wed, 23 Oct 2002 09:02:19 -0800
> >
> > XENIX maybe.
> >
> > : )
> >
> > Regards,
> > Patrice Boivin
> > Systems Analyst (Oracle Certified DBA)
> >
> > Systems Admin & Operations | Admin. et Exploit. des systèmes
> > Technology Services | Services technologiques
> > Informatics Branch | Direction de l'informatique
> > Maritimes Region, DFO | Région des Maritimes, MPO
> >
> > E-Mail: boivinp_at_mar.dfo-mpo.gc.ca
> >
> >
> >
> >
> > -----Original Message-----
> > Sent: Wednesday, October 23, 2002 12:59 PM
> > To: Multiple recipients of list ORACLE-L
> >
> >
> > Is MSSQL server available on UNIX?
> >
> > -Rachna
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > --
> > Author: Boivin, Patrice J
> > INET: BoivinP_at_mar.dfo-mpo.gc.ca
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Author: Tim Gorman
  INET: Tim_at_SageLogix.com

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