Re: [pgsql-ru-general] не используется индекс - Mailing list pgsql-ru-general

> EXPLAIN ANALYZE select * FROM orders_drivers od JOIN drivers d ON d.id = od.did WHERE sid = 2;
                                                               QUERY PLAN
-----------------------------------------------------------------------------------------------------------------------------------------
 Hash Join (cost=808.82..144710.55 rows=486762 width=169) (actual time=0.276..2673.383 rows=667453 loops=1)
   Hash Cond: (od.did = d.id)
   -> Seq Scan on orders_drivers od (cost=0.00..100792.89 rows=11365887 width=30) (actual time=0.015..1149.398 rows=11333318 loops=1)
   -> Hash (cost=807.91..807.91 rows=260 width=139) (actual time=0.248..0.248 rows=260 loops=1)
         Buckets: 1024 Batches: 1 Memory Usage: 33kB
         -> Bitmap Heap Scan on drivers d (cost=93.12..807.91 rows=260 width=139) (actual time=0.057..0.189 rows=260 loops=1)
               Recheck Cond: (sid = 2)
               -> Bitmap Index Scan on drivers_sid_idx (cost=0.00..93.05 rows=260 width=0) (actual time=0.044..0.044 rows=301 loops=1)
                     Index Cond: (sid = 2)
 Total runtime: 2704.437 ms
(10 строк)

\d orders_drivers

 Колонка | Тип | Модификаторы
---------+--------------+-------------------------------------------------------------
 id | integer | NOT NULL DEFAULT nextval('orders_drivers_id_seq'::regclass)
 oid | integer |
 did | integer | NOT NULL
 dist | numeric(8,3) |
 time | integer |
 tid | integer | NOT NULL
 status | order_status | NOT NULL DEFAULT 'request'::order_status
Индексы:
    "orders_drivers_pkey" PRIMARY KEY, btree (id)
    "orders_drivers_oid_did_ukey" UNIQUE, btree (oid, did)
    "orders_drivers_did_key" btree (did)
    "orders_drivers_status_idx" btree (status)


\d drivers
> \d drivers
                       Таблица "public.drivers"
    Колонка | Тип | Модификаторы
---------------+-----------------------------+------------------------
 id | integer | NOT NULL
...
 sid | integer | NOT NULL
...
Индексы:
    "drivers_pkey" PRIMARY KEY, btree (id)
    "drivers_auto_enabled_key" btree (auto_enabled) WHERE auto_enabled IS NOT NULL
    "drivers_auto_order_key" btree (auto_order)
    "drivers_is_bot_key" btree (is_bot) WHERE bot_latitude IS NOT NULL AND bot_longitude IS NOT NULL
    "drivers_lp_time_key" btree (lp_time) WHERE lp_time IS NOT NULL
    "drivers_removed_key" btree (removed)
    "drivers_sid_idx" btree (sid)


почему по orders_drivers делается полный перебор?

--

. ''`. Dmitry E. Oboukhov
: :’ : email: unera@debian.org jabber://UNera@uvw.ru
`. `~’ GPGKey: 1024D / F8E26537 2006-11-21
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