Question

Nextval of a sequence

Asked by: hiranya


Dear Friends.

                  Is there a way to rollback CURRENT VALUE (currval) of a SEQUENCE (that I have generated using SEQUENCE.NEXTVAL option).
                 
Thanks
Hiranya

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Asked On
2004-12-12 at 20:28:52ID21239952
Tags

nextval

,

sequence

Topic

Oracle Database

Participating Experts
2
Points
125
Comments
7

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Answers

 

by: rockmuncherPosted on 2004-12-12 at 20:35:00ID: 12806489

I think you would have to rebuild the sequence

eg.  DROP SEQUENCE sequencename;
      CREATE SEQUENCE sequencename START WITH x;

where x is the value you you want to go back to.

 

by: rockmuncherPosted on 2004-12-12 at 20:36:13ID: 12806493

BTW if you do recreate a sequence then you have to reGRANT all necessary select privs if the sequence is made available across schemas.

 

by: CallumTPosted on 2004-12-12 at 20:36:18ID: 12806494

You can alter the seqeunce to increment by a negative value..select next value, then alter seqeunce again to proper incremental

e.g.

ALTER SEQUENCE my_seq INCREMENT BY -2 ;

select  my_seq.NEXTVAL from dual ;


ALTER SEQUENCE my_seq INCREMENT BY 1 ;


 

by: rockmuncherPosted on 2004-12-12 at 20:44:23ID: 12806525

CallumT's is much a nicer method (no messy broken GRANTs getting in the way)

 

by: hiranyaPosted on 2004-12-12 at 21:30:51ID: 12806654


Dear CallumT/Rockmuncher

Thanks for early reply.
I think CallumT's method is better. but what would happens if some one try to generate a value from the sequence while I am altering the sequence.

Thanks
Hiranya

 

by: CallumTPosted on 2004-12-13 at 01:33:14ID: 12807339

Luck of the Draw..?

Of course, it may not be that simple to just changing the next value . You will have to consider what the seqeunce is used for , e.g. enforcing Referential Integrity, and what the effects are of re-creating same seqeunce numbers.

Also as you point out, how often that sequence is used may cause an impact .,If you are using public synonyms for your sequence, you could always drop the synonym whilst you are changing the seqeunce value. This will effectively disable the seqeunce for other users, but will cause errors....

 

by: hiranyaPosted on 2004-12-13 at 03:34:25ID: 12807910

Thanks for ur help................

Hiranya

20120131-EE-VQP-002

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