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IDS Forum

RE: Antw2: RE: Re: Informix isolation levels

Posted By: NormaJean.Sebastian@tellabs.com
Date:


If oracle is so perfect (pardon me, I have only DBA'd on it for less
than 2 years), why does it error with a "timestamp too old" message?

If I am an end user, I want my data... I don't want my transaction to
abend because the database is confused...

Informix gives me dirty read.. I get my data as of timestamp X... it's
all consistent as of timestamp X. If someone changed the data at
timestamp X+5 (while my rpt is still running), who cares... .. my report
wanted timestamp X, and I got it. Oracle goes poopy on timestamp too
old?

Pardon my ignorance, I could be totally wrong, but I have seen the
'timestamp too old'. I don't really understand it... and I think any
good database should not have that problem.

Norma Jean



-----Original Message-----
From: andreas.kutsche@spar.at [mailto:andreas.kutsche@spar.at]
Sent: Saturday, September 13, 2003 7:57 AM
To: ids@iiug.org; forum.subscriber@iiug.org
Subject: Antw2: RE: Re: Informix isolation levels [1866]


----LNX_Sat_Sep_13_2003_14:54:13_V3.33--
Content-Transfer-Encoding: quoted-printable

>Datum: 2003.09.13 01:45:25
>Sender: Obnoxio The.... <obnoxio@hotmail.com>
>Betreff: RE: Re: Informix isolation levels [1863]
>
>Really. Oracle are wrong. Trust me on this.
>
>--
>Bye now,
>Obnoxio
=

>>>
>>>The developer is wrong. The way Informix handles transactions is
right=
,
>>>the way Oracle handles them is wrong.
>>>
=

>>Andreas Kutsche:
>>
>>I think that's not correct. It's a different approach.
>>
=

I think I should add that my opionion that Oracle is right (too), only
is=
valid
for COMMITTED READ (the most used isolation level in applications I
suppo=
se).
When it comes to SERIALIZABLE than Oracle is really wrong (or not really
serializable under all circumstances) - see
http://www.cs.umb.edu/~isotest/snaptest/snaptest.pdf
or
http://www-dbs.cs.uni-sb.de/papers/tdd99.pdf
for examples (keyword: snapshot isolation ).
=

Regards,
Andreas Kutsche

------------------------------------------------
SPAR Oesterreichische Warenhandels-AG
Hauptzentrale
Europastra=DFe 3
A-5015 Salzburg
=

Telefon : +43 662 4470 24423
E-Mail : Andreas.KUTSCHE@spar.at
Internet: http://www.spar.at
------------------------------------------------

=


----LNX_Sat_Sep_13_2003_14:54:13_V3.33----



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