improve

Author: digoal

201709/20170927_03.md

@@ -80,7 +80,7 @@ create table train_order (
 );  
   
 -- 索引，提高按坐席查询的效率  
-create index idx_train_order_1 on train_order (train_id, box_id);  
+create index idx_train_order_1 on train_order (train_id, box_id, site_id);  
 ```  
 
 冗余一份数据，按用户哈希分区，提高按用户查询的效率。  
@@ -201,30 +201,28 @@ Time: 0.367 ms
 7、schemaless设计来了，按坐席和乘车日期查询，平均返回10条记录。  
 
 ```  
-create or replace function get_site_order(v_get_on date, v_train_id int, v_box_id int2) returns setof train_order as $$  
+create or replace function get_site_order(v_get_on date, v_train_id int, v_box_id int2, v_site_id int2) returns setof train_order as $$  
 declare  
   tbl name := 'train_order_'||to_char(v_get_on,'yyyymmdd');  
 begin  
-  return query execute format('select * from %I where train_id=%L and box_id=%L', tbl, v_train_id, v_box_id);  
+  return query execute format('select * from %I where train_id=%L and box_id=%L and site_id=%L', tbl, v_train_id, v_box_id, v_site_id);  
 end;  
 $$ language plpgsql strict;  
 ```  
 
 ```  
-postgres=# select (get_site_order('2017-10-09', 1999, 3::int2)).* ;  
-     id     | train_id | box_id | site_id | station_1 | station_2 |   get_on   |    uid    | pay_stat |      charge      | weight | window_id |          crt_time          | mod_time   
-------------+----------+--------+---------+-----------+-----------+------------+-----------+----------+------------------+--------+-----------+----------------------------+----------  
- 2402454347 |     1999 |      3 |     108 |        58 |        19 | 2017-10-09 | 933443835 |        1 | 1908.97158834804 |      1 |         1 | 2017-09-27 21:15:26.796659 |   
- 2399727138 |     1999 |      3 |     172 |        87 |        32 | 2017-10-09 |  77002396 |        1 |  8196.2648357721 |      1 |         1 | 2017-09-27 21:14:52.838442 |   
- 2390398889 |     1999 |      3 |     160 |        40 |        20 | 2017-10-09 |  83057290 |        1 | 7491.21171126422 |      1 |         1 | 2017-09-27 21:13:38.190615 |   
- 2388491328 |     1999 |      3 |     196 |        10 |        51 | 2017-10-09 | 733877428 |        1 | 5778.93740894599 |      1 |         1 | 2017-09-27 21:13:22.721515 |   
- 2383766403 |     1999 |      3 |      97 |        32 |         7 | 2017-10-09 | 542053851 |        1 | 2010.56065606233 |      1 |         1 | 2017-09-27 21:12:44.861967 |   
- 2382764531 |     1999 |      3 |      57 |        65 |        12 | 2017-10-09 | 730620343 |        1 | 9508.43552351324 |      1 |         1 | 2017-09-27 21:12:36.790158 |   
- 2381508614 |     1999 |      3 |      78 |         9 |        76 | 2017-10-09 | 553050023 |        1 | 4190.36140979407 |      1 |         1 | 2017-09-27 21:12:26.79828  |   
- 2380100816 |     1999 |      3 |       6 |        63 |        16 | 2017-10-09 | 295268263 |        1 | 6046.77832423523 |      1 |         1 | 2017-09-27 21:12:15.669973 |   
- 2379584703 |     1999 |      3 |     111 |        65 |        89 | 2017-10-09 | 703032018 |        1 | 2217.88949064212 |      1 |         1 | 2017-09-27 21:12:11.534523 |   
- 2378676040 |     1999 |      3 |     140 |        87 |        42 | 2017-10-09 | 762174690 |        1 | 8776.38305891259 |      1 |         1 | 2017-09-27 21:12:03.98851  |   
-(10 rows)  
+postgres=# select (get_site_order('2017-10-09', 1999, 3::int2, 1::int2)).* ;  
+     id     | train_id | box_id | site_id | station_1 | station_2 |   get_on   |    uid    | pay_stat |      charge      | weight | window_id |          crt_time          | mod_time 
+------------+----------+--------+---------+-----------+-----------+------------+-----------+----------+------------------+--------+-----------+----------------------------+----------
+ 2300300781 |     1999 |      3 |       1 |        68 |        14 | 2017-10-09 | 419271707 |        1 |  7061.5369010889 |      1 |         1 | 2017-09-27 20:54:56.710393 | 
+ 2234878940 |     1999 |      3 |       1 |        85 |        45 | 2017-10-09 | 885259649 |        1 |  5214.0475622518 |      1 |         1 | 2017-09-27 20:41:22.906565 | 
+ 2107427991 |     1999 |      3 |       1 |        35 |        98 | 2017-10-09 | 985856266 |        1 | 8642.02400384098 |      1 |         1 | 2017-09-27 20:12:33.85781  | 
+ 1794488978 |     1999 |      3 |       1 |        94 |        20 | 2017-10-09 | 351055777 |        1 | 1718.21027540183 |      1 |         1 | 2017-09-27 19:06:43.643281 | 
+ 1374974043 |     1999 |      3 |       1 |        16 |        26 | 2017-10-09 | 923638283 |        1 | 4711.63916029176 |      1 |         1 | 2017-09-27 17:33:47.147368 | 
+ 1351805341 |     1999 |      3 |       1 |        85 |        74 | 2017-10-09 | 212355965 |        1 | 4541.93220470985 |      1 |         1 | 2017-09-27 17:28:20.974681 | 
+ 1182159676 |     1999 |      3 |       1 |        15 |        31 | 2017-10-09 | 567906740 |        1 | 8566.17715372145 |      1 |         1 | 2017-09-27 16:54:26.478221 | 
+   35506838 |     1999 |      3 |       1 |         1 |        47 | 2017-10-09 | 884099213 |        1 | 983.503066563047 |      1 |         1 | 2017-09-27 13:55:21.280078 | 
+(8 rows)
   
 Time: 0.391 ms  
 ```  
@@ -333,8 +331,9 @@ script statistics:
 vi test2.sql  
   
 \set train_id random(0,19999)  
+\set box_id random(0,19)
 \set site_id random(0,199)  
-select * from get_site_order(current_date+(random()*30)::int, (:train_id)::int, (:site_id)::int2);  
+select * from get_site_order(current_date+(random()*30)::int, (:train_id)::int, (:box_id)::int2, (:site_id)::int2);  
   
 pgbench -M prepared -n -r -P 1 -f ./test2.sql -c 64 -j 64 -T 120  
 ```  
@@ -354,8 +353,9 @@ tps = 213763.615290 (excluding connections establishing)
 script statistics:  
  - statement latencies in milliseconds:  
          0.002  \set train_id random(0,19999)  
+         0.000  \set box_id random(0,19)  
          0.000  \set site_id random(0,199)  
-         0.302  select * from get_site_order(current_date+(random()*30)::int, (:train_id)::int, (:site_id)::int2);  
+         0.302  select * from get_site_order(current_date+(random()*30)::int, (:train_id)::int, (:box_id)::int2, (:site_id)::int2);
 ```  
 
 ## 小结