优化Oracle SQL查询

Question

您好我有一个SQL查询,我正在尝试优化.此查询在0.3秒内完成,但我需要为大量不同的storeId运行相同的查询 - 无论如何都要优化此查询以使其更快,或者更改它以便一次获取所有storeIds.

我总是可以在C#中创建一个新命令,该命令与命令连接,使其成为大量不同查询的联合.

select /*+ PUSH_SUBQ */ *  
from mytable r
where r.s in (1, 7)
and r.d in (1, 75)
and r.storeid = 1162
and r.period = 20110528
and r.pid in (select /*+ no_unnest qb_name(subq1) */ 
productid from otherTable where itmid=9999)

我已经尝试过类似的东西,但这需要永远.

select  /*+ PUSH_SUBQ */ * 
    from mytable r
    where r.s in (1, 7)
    and r.d in (1, 75)
    and r.storeid in (1162, 1223, 1231, 51231, 231, ...)
    and r.period = 20110528
    and r.pid in (select /*+ no_unnest qb_name(subq1) */ 
    productid from otherTable where itmid=9999)

MyTable有这样的索引:pid是NON-UNIQUE,PARTITIONED,NO JOIN_INDEX所有其他列都是UNIQUE,PARTITIONED,NO JOIN_INDEX

Answer 1

尝试在查询上运行Oracle EXPLAIN PLAN.它应突出问题区域,并可能有助于缩小查询本身或要查询的表中的瓶颈.

使用EXPLAIN PLAN:http: //download.oracle.com/docs/cd/B10500_01/server.920/a96533/ex_plan.htm