What is the problem with the sequences on RAC environments?
Version: 10 g, 11GI've never worked on CARS. But I keep seeing discussions about the problems with the sequences on CCR environments. What exactly is the
basic question?
Can be performance issues if you have a large number of sequences of nocache as it may cause heavy IO for the system tablespace.
Given that each instance will have its own cache seqeuence that some sites are unhappy with significant gaps in the values, this can cause.
There was also a blocking problem caused by heavy simultaneous new connection activity requiring the issuance value audsid for the session of v$. To solve this just to the top of the cache size to 1,000 or 10,000 by default if you are on a version where the value was not moved upward by Oracle already.
As far as the first two numbers go that my view is if the sequence does not need to be cached you need not use a sequence to generate value. If you need a value without interval then you need to get your value from a table column value that is part of the transaction and do not use a sequence in a first time.
Sequences are designed for speed and concurrentcy, and this competition is priced at gaps.
HTH - Mark D Powell.
Tags: Database
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