相关疑难解决方法(0)

我目前有一个由于OR语句而缓慢的postgresql查询.它显然没有使用索引.到目前为止,重写此查询失败.

查询:

EXPLAIN ANALYZE SELECT a0_.id AS id0
FROM   advert a0_
       INNER JOIN advertcategory a1_
               ON a0_.advert_category_id = a1_.id
WHERE  a0_.advert_category_id IN ( 1136 )
        OR a1_.parent_id IN ( 1136 )
ORDER  BY a0_.created_date DESC
LIMIT  15;  

                                                                           QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=0.00..27542.49 rows=15 width=12) (actual time=1.658..50.809 rows=15 loops=1)
   ->  Nested Loop  (cost=0.00..1691109.07 rows=921 width=12) (actual time=1.657..50.790 rows=15 loops=1)
         ->  Index Scan Backward using advert_created_date_idx on advert a0_  (cost=0.00..670300.17 rows=353804 width=16) (actual time=0.013..16.449 rows=12405 loops=1)
         ->  Index Scan using advertcategory_pkey on …