直接insert与循环insert测试代码

create table toys (
  toy_id integer
    not null primary key,
  toy_name varchar2(20)
    not null
);

declare
  start_time pls_integer;
  num_rows   pls_integer := 100000;
begin
  start_time := dbms_utility.get_time ();
  for i in ( select level l from dual connect by level <= num_rows )
  loop
    insert into toys ( toy_id, toy_name )
      values ( i.l, 'toy' || lpad ( i.l, 7, '0' ) );
  end loop;
  dbms_output.put_line (
    'Loop duration ' || ( dbms_utility.get_time () - start_time )
  );
 
  execute immediate 'truncate table toys';
 
  start_time := dbms_utility.get_time ();
 
  insert into toys ( toy_id, toy_name )
    select level l, 'toy' || lpad ( level, 7, '0' )
    from   dual
    connect by level <= num_rows;
 
  dbms_output.put_line (
    'One statement duration ' || ( dbms_utility.get_time () - start_time )
  );
end;
/

Loop duration 1298
One statement duration 71