Gaps in sequences set to cache

Would like to know if sequences are set to cache is it possable to see gaps in the sequence when a process like rman or a long period of time accures.
I am trying to pin down why we have gaps. I read a little about if the system comes down then the sequence in cache memory would be lost and Oracle would get the next set of numbers.
10.2.0.4
linux
Thank you,
Steve

user12551219 wrote:
Would like to know if sequences are set to cache is it possable to see gaps in the sequence when a process like rman or a long period of time accures.
I am trying to pin down why we have gaps. IOracle sequences will always have gaps for various reasons, a rollback is one, caching and database shutdowns are others. Caching sequences produces better performance.
The answer is to not care that sequences have gaps.
http://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:4343369880986
A sequence is a unique identifier and not a counter, storing a row count in a table is non-relational and does not perform or scale. If rows need to be counted they should be counted when they are selected.
If you are concerned about losing numbers because you may run out, I wouldn't worry about that for a while either.
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