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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