Melkij

(В любом замесе фпс дропается со 80 до 15, и после замеса восстанавливается). Хотя стресс тест аида64 всей системы проходит бесконечно долго

Table aliases in a multiple-table DELETE should be declared only in the table_references part of the statement. Elsewhere, alias references are permitted but not alias declarations.

надо выбрать все продукты по category_id

WHERE product_id =

next_month := date_part( 'year', NEW.dtime)::text ||'-'|| date_part( 'month', NEW.dtime )::text ||'-31';

table_part := table_master
|| '' || to_char(NOW(), 'YYYY')::text
|| 'm' || to_char(NOW(), 'MM')::text;

update tablename set tree = concat('newbranch.', subpath(tree, 1))::ltree where tree <@ 'origbranch';

melkij=> create table events2016m11 (check (dtime >= '2016-11-01'::date AND dtime < '2016-12-01'::date)) inherits(events);
melkij=> insert into events2016m11 values ('2016-11-20');
INSERT 0 1
melkij=> explain (analyze) select * from events where dtime > '2016-12-05';
                                                   QUERY PLAN                                                   
----------------------------------------------------------------------------------------------------------------
 Append  (cost=0.00..38.25 rows=754 width=8) (actual time=0.013..0.013 rows=0 loops=1)
   ->  Seq Scan on events  (cost=0.00..0.00 rows=1 width=8) (actual time=0.004..0.004 rows=0 loops=1)
         Filter: (dtime > '2016-12-05 00:00:00+03'::timestamp with time zone)
   ->  Seq Scan on events2016m11  (cost=0.00..38.25 rows=753 width=8) (actual time=0.009..0.009 rows=0 loops=1)
         Filter: (dtime > '2016-12-05 00:00:00+03'::timestamp with time zone)
         Rows Removed by Filter: 1
 Planning time: 0.127 ms
 Execution time: 0.032 ms
(8 строк)
melkij=> drop table events2016m11 ;
DROP TABLE
melkij=> create table events2016m11 (check (dtime >= '2016-11-01'::timestamptz AND dtime < '2016-12-01'::timestamptz)) inherits(events);
CREATE TABLE
melkij=> insert into events2016m11 values ('2016-11-20');INSERT 0 1
melkij=> explain (analyze) select * from events where dtime > '2016-12-05';                                              QUERY PLAN                                              
------------------------------------------------------------------------------------------------------
 Append  (cost=0.00..0.00 rows=1 width=8) (actual time=0.004..0.004 rows=0 loops=1)
   ->  Seq Scan on events  (cost=0.00..0.00 rows=1 width=8) (actual time=0.004..0.004 rows=0 loops=1)
         Filter: (dtime > '2016-12-05 00:00:00+03'::timestamp with time zone)
 Planning time: 0.301 ms
 Execution time: 0.024 ms
(5 строк)

melkij=> show constraint_exclusion ;
 constraint_exclusion 
----------------------
 partition