Oracle-L: RE: Sequences in OPS/RAC

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Mon, 03 Nov 2003 07:49:34 -0800
Message-ID: <F001.005D5745.20031103074934@fatcity.com>

me don't think so.

Raj

Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !

-----Original Message-----
Sent: Monday, November 03, 2003 10:39 AM To: Multiple recipients of list ORACLE-L

I have always been comfortable with the idea that Sequences continue to guarantee
uniqueness even in OPS / RAC environments.

However, a recent Builder.Com article by Scott Stephens on the SYS_GUID function has these lines :
"Sequence generator numbers are guaranteed to be unique only for a single instance, which is unsuitable for use as a primary key in parallel or remote environments, where a sequence in each environment might generate the same number and result in conflicts. An identifier created by SYS_GUID is guaranteed to be unique for each database."

Huh ?! Do the lines mean that a single sequence can have duplicate values in the two instances of an RAC cluster ?

Hemant K Chitale
Oracle 9i Database Administrator Certified Professional My personal web site is : http://hkchital.tripod.com

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Author: Hemant K Chitale
INET: hkchital_at_singnet.com.sg

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Author: Jamadagni, Rajendra
INET: Rajendra.Jamadagni_at_espn.com

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