Squance current value of a session?

Hello

Can anyone confirm if the following statement is true?


------------------------------------
If it has more then a session using the same sequence at the same time then I get only the current value of my session.
-----------------------------------

I use oracle 9i and values are inserted in the two tables. First array will have the nextval squance and second table will have curval squance even. I wonder if there is another user using the same sequence at the same time then I'd get the curval of my session (that I just added in the first table) or will it be different session?

Thank you

+ But why the sequence is session based, if it is a global and only used object generate sequental numbers and used by different users? I mean, when I run MY_SEQ. CURRVAL, it makes sense to get the "present value" of the sequence that has been changed from 'everywhere' by 'any person' in the database? +

It is a global object - as a table is a global object. But in a table - you do not see my work and vice versa not validated. Overall not average "see everything", it simply means that the object has a scope such as many people can see it.

global temporary tables are certainly global - their name says even the world. but you don't see me and I don't see yours - by design.

the sequences are the same way - currval is DESIGNED to return your current value sessions. If you want to know the ' system global level current value "simply call nextval. But even that would be not accurate in general - because RAC each INSTANCE has it's own set of values - so the current overall value on node 1 is maybe 42 and on node 2, it can be 1000.

In short, currval is designed only to return the last value of nextval in YOUR SESSION. It was designed this way so that you could easily make an insertion of parent/child:

insert into parent values (... seq.nextval);
insert into child values (... seq.currval);
insert into child values (... seq.currval);

She has designed this years years before the return clause was invented (a method suggested above in another wrong answer to this question) - and was the ONLY way to understand what seq.nextval when inserted into a table returned (before triggers exist yet)

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