у меня есть таблица:
CREATE TABLE my_table
(
id integer NOT NULL DEFAULT nextval('seq_my_table_id'::regclass),
fk_id1 integer NOT NULL,
fk_id2 smallint NOT NULL,
name character varying(255) NOT NULL,
description text,
currency_name character varying(3) NOT NULL,
created timestamp with time zone NOT NULL DEFAULT now(),
updated timestamp with time zone NOT NULL DEFAULT now(),
CONSTRAINT "PK_my_table_id" PRIMARY KEY (id ),
CONSTRAINT "FK_my_table_fk_id1" FOREIGN KEY (fk_id1)
REFERENCES my_table2 (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION DEFERRABLE INITIALLY DEFERRED,
CONSTRAINT "FK_my_table_fk_id2" FOREIGN KEY (fk_id2)
REFERENCES my_table3 (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION DEFERRABLE INITIALLY DEFERRED
)
WITH (
OIDS=FALSE,
autovacuum_enabled=true,
autovacuum_vacuum_threshold=50,
autovacuum_vacuum_scale_factor=0.2,
autovacuum_analyze_threshold=50,
autovacuum_analyze_scale_factor=0.1,
autovacuum_vacuum_cost_delay=20,
autovacuum_vacuum_cost_limit=200,
autovacuum_freeze_min_age=50000000,
autovacuum_freeze_max_age=200000000,
autovacuum_freeze_table_age=150000000
);
ALTER TABLE my_table
OWNER TO postgres;
CREATE INDEX my_table_fk_id1
ON my_table
USING btree
(fk_id1 );
CREATE INDEX my_table_fk_id2
ON my_table
USING btree
(fk_id2 );
количество записей в таблицах
select count(id) from my_table; --24061
select count(id) from my_table2; --24061
select count(id) from my_table3; --123
время выполнения
select * from my_table -- ~17sec
vacuum/analyze - без эффекта
description - длина ~ 4000 символов в каждом ряду
postgres.conf - стандартные настройки
Версия: 9.1
выбрать все поля, кроме описания, сократить время выполнения до ~ 1, 5 сек
Как увеличить скорость выбора с описанием?
upd
--explain analyze select * from my_table
"Seq Scan on my_table (cost=0.00..3425.79 rows=24079 width=1015) (actual time=0.019..17.238 rows=24079 loops=1)"
"Total runtime: 18.649 ms"