Question

处理报告提取和复杂查询需要3个小时。需要调整建议

有一个主表包含3M条记录，由于多次联接，迭代花费了很长时间

表格：

员工
部门
地址
存根
税收

Employee表有3M条记录，当我运行以下查询时，它大约需要3个小时才能获取数据。需要从昨天到今天的数据变化中单独获取那些雇员的数据

select 
    emp.employee_id || '|' || emp.int_acct_id || '|' || dpt.department_desc
    || '|' || dpt.start_date || '|' || dpt.end_date
    || '|' || dpt.productivity_percent || '|' || addr.street_addr 
    || '|' || addr.apt || '|' || addr.city  || '|' || addr.state
    || '|' || addr.country || '|' || addr.zip || '|' || pay_for_year 
    || '|' || total_paid || '|' || pay_for_current_year || '|' || w2_issue_flg
from employee emp
inner join (
  select int_acct_id from (
    select int_acct_id from employee 
    where last_updated_time between '03-nov-19' and '04-nov-19'
    union
    select int_acct_id from department 
    where last_updated_time between '03-nov-19' and '04-nov-19'
  ) dual
) a1 on emp.int_acct_id = a1.int_acct_id
left outer join (
  select department_desc, start_date, end_date, int_acct_id, 
    productivity_percent from department
) dpt on emp.int_acct_id = dpt.int_acct_id
left outer join (
  select addr_acct_id, employee_id, street_addr, apt, city, state, country, zip
  from address
) addr on emp.employee_id = addr.employee_id
left outer join (
  select a.pay_for_year, a.four_not_one as total_paid, 
    b.total_pay as pay_for_curren_year, a.int_acct_id from tax a, (
      select sum(total_pay) as total_pay, int_acct_id 
      from paystubs  where pay_year = (select cur_year from year_dat) 
      group by int_acct_id
    ) b
  where a.int_acct_id = b.int_acct_id(+)
) on a.int_acct_id = emp.int_acct_id

还有其他方法或方法可以用来首先过滤掉时间戳中的修改记录，然后检查其他值。（在这里，游标不是我的选择）数据要从Oracle DB加载到AIX服务器，因此需要时间。另外，提示也无济于事，我尝试了Leading /命令并没有运气。

调优复杂的查询

0 个答案: