原理：
每个sql语句都它的执行计划，并且执行计划会放在plan_table中，plan_table中有object_name一列，该列表示sql语句中的对象名字，执行计划对表很感兴趣，所以如果object_type=’TABLE’,那么object_name就是我们要截取的table_name
执行步骤：
1、创建tmp_table 表，存放job名job_id,sql语句select_sql,和表名object_name
create table tmp_table(job_idvarchar2(50),select_sql clob,object_name varchar2(50));
模拟数据：
A job中是一条比较短的sql语句
B job中是一条比较长的sql语句
INSERTINTO TMP_TABLE VLAUES(‘A’,q’[A中的内容]’);
INSERTINTO TMP_TABLE VLAUES(‘B’,q’[B中的内容]’);
Commit;
2、创建p存储过程,根据执行计划
--以下是用4000以下的A job和4000 以上的B一起运行
create or replace procedure sqljiexiqi as
v_str varchar2(4000);
v_sql varchar2(4000);
v_sql1 varchar2(4000);
v_sql2 varchar2(4000);
v_sql3 varchar2(4000);
v_sql4 varchar2(4000);
v_sql5 varchar2(4000);
v_sql6 varchar2(4000);
v_sql7 varchar2(4000);
v_sql8 varchar2(4000);
v_sql9 varchar2(4000);
begin
dbms_output.enable(8000);
execute immediate 'truncate table tmp_table';
forc in (select job_id, select_sql
from bds.etl_job_info
where length(trim(select_sql)) < 4000
and job_id = 'A') loop
v_sql := 'explain plan SET STATEMENT_ID=''' || c.job_id || ''' for ' ||
c.select_sql;
execute immediate v_sql;
for re in (select distinct object_name
from plan_table
where statement_id = c.job_id
and object_type = 'TABLE') loop
insert into tmp_table
(job_id, select_sql, object_name)
values
(c.job_id, c.select_sql, re.object_name);
end loop;
commit;
endloop;
forc in (select job_id, select_sql
from bds.etl_job_info
where length(trim(select_sql)) > =4000
and job_id ='SJ_AS_CM_MORT_DTL_D') loop
v_str := 'explain plan SETSTATEMENT_ID=''' || c.job_id || ''' for ';
v_sql := substr(c.select_sql, 1,4000);
v_sql1 := substr(c.select_sql, 1 * 4000 + 1, 4000);
v_sql2 := substr(c.select_sql, 2 * 4000 + 1, 4000);
v_sql3 := substr(c.select_sql, 3 * 4000 + 1, 4000);
v_sql4 := substr(c.select_sql, 4 * 4000 + 1, 4000);
v_sql5 := substr(c.select_sql, 5 * 4000 + 1, 4000);
v_sql6:= substr(c.select_sql, 6 * 4000 + 1, 4000);
v_sql7 := substr(c.select_sql, 7 * 4000 + 1, 4000);
v_sql8 := substr(c.select_sql, 8 * 4000 + 1, 4000);
v_sql9 := substr(c.select_sql, 9 * 4000 + 1, 4000);
execute immediate v_str || v_sql || v_sql1 || v_sql2 || v_sql3 ||
v_sql4 || v_sql5 ||v_sql6 || v_sql7 || v_sql8 ||
v_sql9;
for re in (select distinct object_name
from plan_table
where statement_id = c.job_id
and object_type = 'TABLE')loop
insert into tmp_table
(job_id, select_sql, object_name)
values
(c.job_id, c.select_sql, re.object_name);
end loop;
commit;
endloop;
end;
3、执行存储过程
exec sqljiexiqi;
4、查询tmp_table表，得到sql中有哪些表
select * from tmp_table;