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Sequence - ORDER & NOORDER

edited May 15, 2011 9:27PM in Database Administration (MOSC) 1 commentAnswered
 I'm confusing of ORDER & NOORDER keywords when creating a sequence.

From Oracle Doc:

ORDER
guarantees that sequence numbers are generated in order of request. You may want to use this option if you are using the sequence numbers as timestamps. Guaranteeing order is usually not important for sequences used to generate primary keys.

NOORDER
does not guarantee sequence numbers are generated in order of request. If you omit both the ORDER and NOORDER options, Oracle chooses NOORDER by default. Note that the ORDER option is only necessary to guarantee ordered generation if you are using Oracle with the Parallel Server option in parallel mode. If you are using exclusive mode, sequence numbers are always generated in order.

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