求问各位大佬postgressql里面优化问题。
我有一张表如下
Table "public.company_geo_table"
Column | Type | Collation | Nullable | Default
--------------------+--------+-----------+----------+---------
geoname_id | bigint | | |
date | text | | |
cik | text | | |
count | bigint | | |
country_iso_code | text | | |
subdivision_1_name | text | | |
city_name | text | | |
Indexes:
"cik_country_index" btree (cik, country_iso_code)
"cik_geoname_index" btree (cik, geoname_id)
"cik_index" btree (cik)
"date_index" brin (date)
现在执行如下sql语句，主要针对cik，date查询，以及group by cik和geoname 进行分区统计。
select cik, geoname_id, sum(count) as total
from company_geo_table
where cik = '1111111'
and date between '2016-01-01' and '2016-01-10'
group by cik, geoname_id;
然后explain结果发现好像只用了cik和date的index，groupby的index并没有使用。
HashAggregate (cost=117182.79..117521.42 rows=27091 width=47) (actual time=560132.903..560134.229 rows=3552 loops=1)
Group Key: cik, geoname_id
-> Bitmap Heap Scan on company_geo_table (cost=16467.77..116979.48 rows=27108 width=23) (actual time=6486.232..560114.828 rows=8175 loops=1)
Recheck Cond: ((date >= '2016-01-01'::text) AND (date <= '2016-01-10'::text) AND (cik = '1111111::text))
Rows Removed by Index Recheck: 16621155
Heap Blocks: lossy=193098
-> BitmapAnd (cost=16467.77..16467.77 rows=27428 width=0) (actual time=6469.640..6469.641 rows=0 loops=1)
-> Bitmap Index Scan on date_index (cost=0.00..244.81 rows=7155101 width=0) (actual time=53.034..53.035 rows=8261120 loops=1)
Index Cond: ((date >= '2016-01-01'::text) AND (date <= '2016-01-10'::text))
-> Bitmap Index Scan on cik_index (cost=0.00..16209.15 rows=739278 width=0) (actual time=6370.930..6370.930 rows=676231 loops=1)
Index Cond: (cik = '1111111'::text)
Planning time: 12.909 ms
Execution time: 560135.432 ms
想问下大家我设置的index都合理吗？有没有什么优化的方法？或者sql语句有什么优化的地方吗？
非常感谢！！！
