个人实验的时候有时会用到一些大表，在此分享用dba_objects来创建测试大表的方法：
首先建立测试表
SYS@ORCL>create table test nologging as select rownum id,a.* from dba_objects a where 1=2;
Table created.
插入500万条数据：
SYS@ORCL>declare
l_cnt number;
l_rows number:=&1;
begin
insert /*+ append */ into test select rownum,a.* from dba_objects a;
l_cnt:=sql%rowcount;
commit;
while(l_cnt loop insert /*+ append */ into test select rownum+l_cnt, owner,object_name,subobject_name, object_id,data_object_id, object_type,created,last_ddl_time, timestamp,status,temporary, generated,secondary from sales where rownum<=l_rows-l_cnt; l_cnt:=l_cnt+sql%rowcount; commit; end loop; end; 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 / Enter value for 1: 5000000 old 3: l_rows number:=&1; new 3: l_rows number:=5000000; PL/SQL procedure successfully completed.