This SQL identifies Oracle sequences that are above 90% used:
select sequence_owner "Owner", sequence_name "Name", last_number "Last", max_value "Max", last_number/max_value*100 "Pct Used" from dba_sequences where sequence_owner not in ('SYS') and last_number/max_value*100 < 101 and last_number/max_value*100 > 90 order by "Pct Used" desc