SQL（Postgres）最佳联接数
此查询正在postgres版本12中执行。此查询包含8个连接，持续约5秒 查询1SQL（Postgres）最佳联接数,sql,postgresql,Sql,Postgresql,此查询正在postgres版本12中执行。此查询包含8个连接，持续约5秒 查询1 select * from "public"."products" "P" inner join "system"."categories" "C" on "C"."id" = "P"."id_category"
select *
from "public"."products" "P"
inner join "system"."categories" "C" on "C"."id" = "P"."id_category"
inner join "public"."businesses" "E" on "E"."id" = "P"."id_business"
left join "public"."product_files" "pf" on "pf"."id_product" = "P"."id"
left join "system"."files" "f" on "f"."name" = "pf"."img_code"
left join "public"."product_variations" "pv" on ("pv"."id_product" = "P"."id" and "pv"."status" <> 'Deleted')
left join "public"."product_stocks" "ps" on ("ps"."id_product_variation" = "pv"."id" and "ps"."status" <> 'Deleted')
left join "public"."product_stocks" "pps" on ("pps"."id_product" = "P"."id" and "pps"."status" <> 'Deleted')
inner join search_products( array['tires'], 8, 1, 'es') "search" on search.id = "P"."id"
where "P"."status" <> 'Deleted'
Merge Join (cost=112948.60..121805.61 rows=4996 width=1145) (actual time=2003.599..2426.892 rows=40 loops=1)
Merge Cond: ("P".id = search.id)
Buffers: shared hit=760531, temp read=16912 written=18837
-> Merge Left Join (cost=112888.52..120950.73 rows=287945 width=1105) (actual time=1607.013..2093.722 rows=380961 loops=1)
Merge Cond: ("P".id = pf.id_product)
Buffers: shared hit=752079, temp read=15561 written=15606
-> Merge Left Join (cost=16288.22..19167.29 rows=57631 width=771) (actual time=165.803..271.662 rows=76193 loops=1)
Merge Cond: ("P".id = pps.id_product)
Buffers: shared hit=3820, temp read=2706 written=2733
-> Merge Left Join (cost=16287.81..16577.01 rows=57631 width=686) (actual time=165.787..217.878 rows=56921 loops=1)
Merge Cond: ("P".id = pv.id_product)
Buffers: shared hit=2058, temp read=2706 written=2733
-> Sort (cost=14888.93..15033.01 rows=57631 width=514) (actual time=156.825..175.154 rows=56920 loops=1)
Sort Key: "P".id
Sort Method: external merge Disk: 21840kB
Buffers: shared hit=1430, temp read=2706 written=2733
-> Hash Join (cost=43.49..2484.49 rows=57631 width=514) (actual time=0.266..64.052 rows=57631 loops=1)
Hash Cond: ("P".id_business = "E".id)
Buffers: shared hit=1430
-> Hash Join (cost=37.81..2322.14 rows=57631 width=374) (actual time=0.214..39.402 rows=57631 loops=1)
Hash Cond: ("P".id_category = "C".id)
Buffers: shared hit=1427
-> Seq Scan on products "P" (cost=0.00..2132.41 rows=57631 width=252) (actual time=0.009..12.754 rows=57631 loops=1)
Filter: ((status)::text <> 'Deleted'::text)
Rows Removed by Filter: 2
Buffers: shared hit=1412
-> Hash (cost=25.14..25.14 rows=1014 width=122) (actual time=0.201..0.201 rows=1014 loops=1)
Buckets: 1024 Batches: 1 Memory Usage: 124kB
Buffers: shared hit=15
-> Seq Scan on categories "C" (cost=0.00..25.14 rows=1014 width=122) (actual time=0.007..0.078 rows=1014 loops=1)
Buffers: shared hit=15
-> Hash (cost=4.19..4.19 rows=119 width=140) (actual time=0.047..0.048 rows=119 loops=1)
Buckets: 1024 Batches: 1 Memory Usage: 29kB
Buffers: shared hit=3
-> Seq Scan on businesses "E" (cost=0.00..4.19 rows=119 width=140) (actual time=0.013..0.024 rows=119 loops=1)
Buffers: shared hit=3
-> Sort (cost=1398.88..1399.05 rows=70 width=172) (actual time=8.956..8.958 rows=3 loops=1)
Sort Key: pv.id_product
Sort Method: quicksort Memory: 43kB
Buffers: shared hit=628
-> Hash Right Join (cost=4.58..1396.73 rows=70 width=172) (actual time=8.853..8.912 rows=70 loops=1)
Hash Cond: (ps.id_product_variation = pv.id)
Buffers: shared hit=628
-> Seq Scan on product_stocks ps (cost=0.00..1259.35 rows=50589 width=85) (actual time=0.009..7.030 rows=50595 loops=1)
Filter: ((status)::text <> 'Deleted'::text)
Rows Removed by Filter: 73
Buffers: shared hit=626
-> Hash (cost=3.70..3.70 rows=70 width=87) (actual time=0.048..0.049 rows=70 loops=1)
Buckets: 1024 Batches: 1 Memory Usage: 16kB
Buffers: shared hit=2
-> Seq Scan on product_variations pv (cost=0.00..3.70 rows=70 width=87) (actual time=0.020..0.039 rows=70 loops=1)
Filter: ((status)::text <> 'Deleted'::text)
Rows Removed by Filter: 66
Buffers: shared hit=2
-> Index Scan using product_stocks_id_product_id_product_variation_id_location_key on product_stocks pps (cost=0.41..1819.97 rows=50589 width=85) (actual time=0.013..17.822 rows=49924 loops=1)
Filter: ((status)::text <> 'Deleted'::text)
Rows Removed by Filter: 1
Buffers: shared hit=1762
-> Materialize (cost=96600.25..98040.03 rows=287955 width=334) (actual time=1441.203..1613.160 rows=380961 loops=1)
Buffers: shared hit=748259, temp read=12855 written=12873
-> Sort (cost=96600.25..97320.14 rows=287955 width=334) (actual time=1441.198..1567.183 rows=284596 loops=1)
Sort Key: pf.id_product
Sort Method: external merge Disk: 102840kB
Buffers: shared hit=748259, temp read=12855 written=12873
-> Merge Left Join (cost=0.84..44546.48 rows=287955 width=334) (actual time=0.021..1013.742 rows=287955 loops=1)
Merge Cond: ((pf.img_code)::text = (f.name)::text)
Buffers: shared hit=748259
-> Index Scan using product_files_pkey on product_files pf (cost=0.42..10516.05 rows=287955 width=66) (actual time=0.005..184.173 rows=287955 loops=1)
Buffers: shared hit=289884
-> Index Scan using files_pkey on files f (cost=0.42..29304.42 rows=455180 width=268) (actual time=0.005..338.206 rows=455178 loops=1)
Buffers: shared hit=458375
-> Sort (cost=60.08..62.58 rows=1000 width=40) (actual time=313.554..313.558 rows=36 loops=1)
Sort Key: search.id
Sort Method: quicksort Memory: 25kB
Buffers: shared hit=8452, temp read=1351 written=3231
-> Function Scan on search_products search (cost=0.25..10.25 rows=1000 width=40) (actual time=313.544..313.545 rows=8 loops=1)
Buffers: shared hit=8452, temp read=1351 written=3231
Planning Time: 2.632 ms
Execution Time: 2440.414 ms
选择*
来自“public”。“products”“P”
内部联接“系统”。“C”上的“类别”“C”。“id”=“P”。“id\U类别”
内部连接“公共”。“企业”在“E”上的“E”。“id”=“P”。“id\u企业”
左键连接“public”。“产品”文件“pf”在“pf”上。“id\u产品”=“P”。“id”
左键连接“系统”“文件”“f”“f”“f”“名称”“pf”“img_代码”
左键连接“公共”。“产品”变体“pv”在（“pv”。“id产品”=“P”。“id”和“pv”。“状态”“已删除”）
左键连接“公共”。“产品库存”“ps”在（“ps”。“id\U产品变化”=“pv”。“id”和“ps”。“状态”“已删除”）
左键加入“公共”。“产品”储存在（“pps”。“id产品”=“P”。“id”和“pps”。“状态”“已删除”）
内部连接搜索_产品（数组['tires']，8，1，'es'）在search.id=“P”“id”上的“search”
其中“P”。“状态”为“已删除”
select *
from "public"."products" "P"
inner join "system"."categories" "C" on "C"."id" = "P"."id_category"
inner join "public"."businesses" "E" on "E"."id" = "P"."id_business"
left join "public"."product_files" "pf" on "pf"."id_product" = "P"."id"
left join "system"."files" "f" on "f"."name" = "pf"."img_code"
left join "public"."product_variations" "pv" on ("pv"."id_product" = "P"."id" and "pv"."status" <> 'Deleted')
left join "public"."product_stocks" "ps" on ("ps"."id_product_variation" = "pv"."id" and "ps"."status" <> 'Deleted')
left join "public"."product_stocks" "pps" on ("pps"."id_product" = "P"."id" and "pps"."status" <> 'Deleted')
inner join search_products( array['tires'], 8, 1, 'es') "search" on search.id = "P"."id"
where "P"."status" <> 'Deleted'
Merge Join (cost=112948.60..121805.61 rows=4996 width=1145) (actual time=2003.599..2426.892 rows=40 loops=1)
Merge Cond: ("P".id = search.id)
Buffers: shared hit=760531, temp read=16912 written=18837
-> Merge Left Join (cost=112888.52..120950.73 rows=287945 width=1105) (actual time=1607.013..2093.722 rows=380961 loops=1)
Merge Cond: ("P".id = pf.id_product)
Buffers: shared hit=752079, temp read=15561 written=15606
-> Merge Left Join (cost=16288.22..19167.29 rows=57631 width=771) (actual time=165.803..271.662 rows=76193 loops=1)
Merge Cond: ("P".id = pps.id_product)
Buffers: shared hit=3820, temp read=2706 written=2733
-> Merge Left Join (cost=16287.81..16577.01 rows=57631 width=686) (actual time=165.787..217.878 rows=56921 loops=1)
Merge Cond: ("P".id = pv.id_product)
Buffers: shared hit=2058, temp read=2706 written=2733
-> Sort (cost=14888.93..15033.01 rows=57631 width=514) (actual time=156.825..175.154 rows=56920 loops=1)
Sort Key: "P".id
Sort Method: external merge Disk: 21840kB
Buffers: shared hit=1430, temp read=2706 written=2733
-> Hash Join (cost=43.49..2484.49 rows=57631 width=514) (actual time=0.266..64.052 rows=57631 loops=1)
Hash Cond: ("P".id_business = "E".id)
Buffers: shared hit=1430
-> Hash Join (cost=37.81..2322.14 rows=57631 width=374) (actual time=0.214..39.402 rows=57631 loops=1)
Hash Cond: ("P".id_category = "C".id)
Buffers: shared hit=1427
-> Seq Scan on products "P" (cost=0.00..2132.41 rows=57631 width=252) (actual time=0.009..12.754 rows=57631 loops=1)
Filter: ((status)::text <> 'Deleted'::text)
Rows Removed by Filter: 2
Buffers: shared hit=1412
-> Hash (cost=25.14..25.14 rows=1014 width=122) (actual time=0.201..0.201 rows=1014 loops=1)
Buckets: 1024 Batches: 1 Memory Usage: 124kB
Buffers: shared hit=15
-> Seq Scan on categories "C" (cost=0.00..25.14 rows=1014 width=122) (actual time=0.007..0.078 rows=1014 loops=1)
Buffers: shared hit=15
-> Hash (cost=4.19..4.19 rows=119 width=140) (actual time=0.047..0.048 rows=119 loops=1)
Buckets: 1024 Batches: 1 Memory Usage: 29kB
Buffers: shared hit=3
-> Seq Scan on businesses "E" (cost=0.00..4.19 rows=119 width=140) (actual time=0.013..0.024 rows=119 loops=1)
Buffers: shared hit=3
-> Sort (cost=1398.88..1399.05 rows=70 width=172) (actual time=8.956..8.958 rows=3 loops=1)
Sort Key: pv.id_product
Sort Method: quicksort Memory: 43kB
Buffers: shared hit=628
-> Hash Right Join (cost=4.58..1396.73 rows=70 width=172) (actual time=8.853..8.912 rows=70 loops=1)
Hash Cond: (ps.id_product_variation = pv.id)
Buffers: shared hit=628
-> Seq Scan on product_stocks ps (cost=0.00..1259.35 rows=50589 width=85) (actual time=0.009..7.030 rows=50595 loops=1)
Filter: ((status)::text <> 'Deleted'::text)
Rows Removed by Filter: 73
Buffers: shared hit=626
-> Hash (cost=3.70..3.70 rows=70 width=87) (actual time=0.048..0.049 rows=70 loops=1)
Buckets: 1024 Batches: 1 Memory Usage: 16kB
Buffers: shared hit=2
-> Seq Scan on product_variations pv (cost=0.00..3.70 rows=70 width=87) (actual time=0.020..0.039 rows=70 loops=1)
Filter: ((status)::text <> 'Deleted'::text)
Rows Removed by Filter: 66
Buffers: shared hit=2
-> Index Scan using product_stocks_id_product_id_product_variation_id_location_key on product_stocks pps (cost=0.41..1819.97 rows=50589 width=85) (actual time=0.013..17.822 rows=49924 loops=1)
Filter: ((status)::text <> 'Deleted'::text)
Rows Removed by Filter: 1
Buffers: shared hit=1762
-> Materialize (cost=96600.25..98040.03 rows=287955 width=334) (actual time=1441.203..1613.160 rows=380961 loops=1)
Buffers: shared hit=748259, temp read=12855 written=12873
-> Sort (cost=96600.25..97320.14 rows=287955 width=334) (actual time=1441.198..1567.183 rows=284596 loops=1)
Sort Key: pf.id_product
Sort Method: external merge Disk: 102840kB
Buffers: shared hit=748259, temp read=12855 written=12873
-> Merge Left Join (cost=0.84..44546.48 rows=287955 width=334) (actual time=0.021..1013.742 rows=287955 loops=1)
Merge Cond: ((pf.img_code)::text = (f.name)::text)
Buffers: shared hit=748259
-> Index Scan using product_files_pkey on product_files pf (cost=0.42..10516.05 rows=287955 width=66) (actual time=0.005..184.173 rows=287955 loops=1)
Buffers: shared hit=289884
-> Index Scan using files_pkey on files f (cost=0.42..29304.42 rows=455180 width=268) (actual time=0.005..338.206 rows=455178 loops=1)
Buffers: shared hit=458375
-> Sort (cost=60.08..62.58 rows=1000 width=40) (actual time=313.554..313.558 rows=36 loops=1)
Sort Key: search.id
Sort Method: quicksort Memory: 25kB
Buffers: shared hit=8452, temp read=1351 written=3231
-> Function Scan on search_products search (cost=0.25..10.25 rows=1000 width=40) (actual time=313.544..313.545 rows=8 loops=1)
Buffers: shared hit=8452, temp read=1351 written=3231
Planning Time: 2.632 ms
Execution Time: 2440.414 ms
Merge Join（成本=112948.60..121805.61行=4996宽度=1145）（实际时间=2003.599..2426.892行=40个循环=1）
合并条件：（“P.id=search.id）
缓冲区：共享命中=760531，临时读取=16912写入=18837
->合并左连接（成本=112888.52..120950.73行=287945宽度=1105）（实际时间=1607.013..2093.722行=380961循环=1）
合并条件：（“P.id=pf.id\u产品）
缓冲区：共享命中=752079，临时读取=15561写入=15606
->合并左连接（成本=16288.22..19167.29行=57631宽度=771）（实际时间=165.803..271.662行=76193循环=1）
合并条件：（“P.id=pps.id\u产品）
缓冲区：共享命中=3820，临时读取=2706写入=2733
->合并左连接（成本=16287.81..16577.01行=57631宽度=686）（实际时间=165.787..217.878行=56921循环=1）
合并条件：（“P.id=pv.id\u产品）
缓冲区：共享命中=2058，临时读取=2706写入=2733
->排序（成本=14888.93..15033.01行=57631宽度=514）（实际时间=156.825..175.154行=56920循环=1）
排序键：“P”.id
排序方法：外部合并磁盘：21840kB
缓冲区：共享命中=1430，临时读取=2706写入=2733
->散列联接（成本=43.49..2484.49行=57631宽度=514）（实际时间=0.266..64.052行=57631循环=1）
散列条件：（“P.id\u business=“E.id”）
缓冲区：共享命中=1430
->散列联接（成本=37.81..2322.14行=57631宽度=374）（实际时间=0.214..39.402行=57631循环=1）
散列条件：（“P.id\u category=“C.id”）
缓冲区：共享命中=1427
->产品“P”上的顺序扫描（成本=0.00..2132.41行=57631宽度=252）（实际时间=0.009..12.754行=57631循环=1）
筛选器：（（状态）：：文本“已删除”：：文本）
被筛选器删除的行：2
缓冲区：共享命中=1412
->散列（成本=25.14..25.14行=1014宽度=122）（实际时间=0.201..0.201行=1014循环=1）
存储桶：1024批：1内存使用量：124kB
缓冲区：共享命中=15
->对类别“C”的顺序扫描（成本=0.00..25.14行=1014宽度=122）（实际时间=0.007..0.078行=1014圈=1）
缓冲区：共享命中=15
->散列（成本=4.19..4.19行=119宽度=140）（实际时间=0.047..0.048行=119循环=1）
存储桶：1024批：1内存使用量：29kB
缓冲区：共享命中=3
->业务“E”上的顺序扫描（成本=0.00..4.19行=119宽度=140）（实际时间=0.013..0.024行=119圈=1）
缓冲区：共享命中=3
->排序（成本=1398.88..1399.05行=70宽度=172）（实际时间=8.956..8.958行=3个循环=1）
排序键：pv.id\U产品
排序方法：快速排序内存：43kB
缓冲区：共享命中=628
->散列右连接（成本=4.58..1396.73行=70宽度=172）（实际时间=8.853..8.912行=70循环=1）
散列条件：（ps.id\u产品变量=pv.id）
缓冲区：共享命中=628
->产品上的序列扫描（成本=0.00..1259.35行=50589宽度=85）（实际时间=0.009..7.030行=50595循环=1）
筛选器：（（状态）：：文本“已删除”：：文本）
被筛选器删除的行：73
缓冲区：共享命中=626
->散列（成本=3.70..3.70行=70宽度=87）（实际时间=0.048..0.049行=70循环=1）
存储桶：1024批：1内存使用量：16kB
缓冲区：共享命中=2
->产品变更pv上的顺序扫描（成本=0.00..3.70行=70宽度=87）（实际时间=0.020..0.039行=70圈=1）
筛选器：（（状态）：：文本“已删除”：：文本）
被筛选器删除的行：66
缓冲区：共享命中=2
->使用产品库存pps上的产品库存id产品id产品变异id位置键进行索引扫描（成本=0.41..1819.97行=50589宽度=85）（实际时间=0.013）。