Reset a Sequence at Midnight on New Years Eve

Question

Hi,
How can I reset a sequence generator at midnight on New Year’s Eve?
Using SQL script and SQL-Plus, I know how to set the sequence increment to a negative number large enough to return the “Next Val” to 1 (then re-set increment to 1).
But, ‘need help to understand how to cause this action to happen automatically. I’m thinking along the lines of a trigger or stored procedure.
Thank you

Answer 1

I have some thing to add to John's idea.
You could use a negative INCREMENT BY. Typically most sequences are created without reference to minvalue. Oracle sets a value for the minvalue. If the original sequence was not created with 'nominvalue' then, the error like the following will show up.
ORA-08004: sequence sequencename.NEXTVAL goes below MINVALUE and cannot be instantiated
Hence you are better off doing the following in order.
1. Alter the sequence and set the appropriate negative INCREMENT BY and also specify 'nominvalue'.
2. Use a select statement to get the next value.
3. Alter the sequence a second time to set INCREMENT BY to the original value.
Some one could put this in a script and run it only once.