小编ins*_*ide的帖子

我试图理解为什么我的查询需要很长时间，即使我已经索引了所需的列：

SELECT entity_id,
       id,
       report_date
FROM own_inst_detail
WHERE ( own_inst_detail.id = 'P7M7WC-S' )
  AND ( own_inst_detail.report_date >= '2017-02-01T17:29:49.661Z' )
  AND ( own_inst_detail.report_date <= '2018-08-01T17:29:49.663Z' )

缓存结果EXPLAIN ANALYZE如下：

Bitmap Heap Scan on own_inst_detail (cost=20.18..2353.55 rows=597 width=22) (actual time=1.471..6.955 rows=4227 loops=1)
  Recheck Cond: ((id = 'P7M7WC-S'::bpchar) AND (report_date >= '2017-06-01'::date) AND (report_date <= '2018-08-01'::date))
  Heap Blocks: exact=4182
  ->  Bitmap Index Scan on own_inst_detail  (cost=0.00..20.03 rows=597 width=0) (actual time=0.901..0.901 rows=4227 loops=1)
        Index Cond: ((id = 'P7M7WC-S'::bpchar) AND (report_date >= '2017-06-01'::date) AND …