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Home -> Community -> Mailing Lists -> Oracle-L -> RE: RE: oracle or mssql
It sounds like he is saying that, once an "insert, update or delete"
statement has been issued (without a following commit), then the records
acted upon are now considered "dirty" - i.e. needing writing to disk.
this is, of course, NOT what Oracle considers a dirty block.
I agree with you, Jared!
Tom Mercadante
Oracle Certified Professional
-----Original Message-----
Sent: Wednesday, October 30, 2002 1:21 PM
To: Multiple recipients of list ORACLE-L
At least one of us has the incorrect understanding of 'dirty' reads, or I am taking you too literally, or something.
What are you really saying?
Oracle does not allow dirty reads.
All queries are consistent to a point in time, the beginning of a transaction, whether implicit (select) or explicit ( start transaction ).
SQL Server and Sybase do not guarantee this.
The 'dirty' reads you are speaking of sound more to me like sloppy programming.
Is that what you're referring to?
Jared
"Yechiel Adar" <adar76_at_inter.net.il>
Sent by: root_at_fatcity.com
10/30/2002 08:54 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
cc:
Subject: Re: RE: oracle or mssql
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?
-----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: Mohammad Rafiq
> INET: rafiq9857_at_hotmail.com
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: GKor_at_rdw.nl Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: dgoulet_at_vicr.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Jenner Mike INET: M.Jenner_at_southampton.gov.uk Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Yechiel Adar INET: adar76_at_inter.net.il Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: Jared.Still_at_radisys.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Mercadante, Thomas F INET: NDATFM_at_labor.state.ny.us Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Wed Oct 30 2002 - 12:42:30 CST
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