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.
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#';Cheers Tobias