During one of my projects I had an issue when I copied the DDL from my test environment into my productive system. Unfortunately I needed some of the test data in the prod system as well. For that I had to migrate most of the sequences starting with their last number. SQL Developer created those sequences starting with 1. This simple code fixed my issue.
Cheers Tobias
select 'DROP SEQUENCE "'||SEQUENCE_NAME||'";' ||
' CREATE SEQUENCE "'||SEQUENCE_NAME||'"' ||
' MINVALUE 1 MAXVALUE 999999999999999999999999999' ||
' INCREMENT BY 1 START WITH ' || to_char(last_number+1) ||
' NOCACHE NOORDER NOCYCLE ; ' as seq_code
from all_sequences
where sequence_owner = '#SCHEMA_NAME#';