call sys.optimizer_switch_on();
option	opt
condition_pushdown_for_derived	on
condition_pushdown_for_subquery	on
condition_pushdown_from_having	on
derived_merge	on
derived_with_keys	on
exists_to_in	on
extended_keys	on
firstmatch	on
hash_join_cardinality	on
index_condition_pushdown	on
index_merge	on
index_merge_intersection	on
index_merge_sort_union	on
index_merge_union	on
in_to_exists	on
join_cache_bka	on
join_cache_hashed	on
join_cache_incremental	on
loosescan	on
materialization	on
optimize_join_buffer_size	on
orderby_uses_equalities	on
outer_join_with_cache	on
partial_match_rowid_merge	on
partial_match_table_scan	on
rowid_filter	on
sargable_casefold	on
semijoin	on
semijoin_with_cache	on
split_materialized	on
subquery_cache	on
table_elimination	on
call sys.optimizer_switch_off();
option	opt
cset_narrowing	off
index_merge_sort_intersection	off
mrr	off
mrr_cost_based	off
mrr_sort_keys	off
not_null_range_scan	off