application of sequence

Hi Master,

I have a requirement on the sequences. Please find below my requirement. Please advise me.


Please explain without order in the sequence.

Thanks to the adv.

Concerning

AR

You listed the choices in order from best to the worst, while you seem to have a few ideas yourself.  You option 2 with ORDER will require additional communication between two nodes of the RAC so that they can coordinate the order of numbers in sequence between thermselves.  I'm not sure that it's worth to have ordered sequences.

You should also be aware that even if you declare the ordered sequence, this does not mean that a single session will receive an ordered set of values contiginous.  Everything what means of CONTROL are that the first request for a sequence value will get 1 second then 2 etc., even if they are on different nodes of the RAC.  However, even with an orderly sequence, if there are two session running on the same node, they behave similarly, so session 1 could easily obtain values 1, 3, 5, 6, 9.

For your second question, the second batch on node 1 will star with 6 (assuming that the sequence on node 1 does not get old in the cache).  When using the values of 20 he get another batch of 20, will launch usng those.  Assuming that this node 2 has already asked another batch, who would be 41-60.

Unless you insert thousands of lines at a time, a cache of 20 is generally sufficient for most cases.  There is no real harm to have a larger cache, but maybe there's not a significant advantage.  You should test different cache sizes in your environment.

Even if you did not mention it, it's always good to stress that the sequences are not intended to free space, or used to indicate the insertion order.

John

Tags: Database

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