02 表扫描

并行执行

select /*+ parallel(t1, 1) */ count(* ) from t1;

select /*+ parallel(t1, 2) */ count(* ) from t1;

select /*+ parallel(t1, 3) */ count(* ) from t1;

select /*+ parallel(t1, 4) */ count(* ) from t1;

用到时, 再确认吧