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From: Kenny Bachman <[email protected]>
To: [email protected]
Subject: postgresql-14 slow query
Date: Fri, 15 Apr 2022 23:59:25 +0300
Message-ID: <CAC0w7L+cxDkvgeM9vA_pPTAQ0pMo4PLuh9s-rCyR9AoLnYTL3A@mail.gmail.com> (raw)

Hello Team,

How can I tune this query? It got even slower when I created the index for
(state_id, order_id desc). The following explain analyze output is
without an index. It takes 13 seconds if I create that index. Could you
help me?

Thank you so much for your help.

SELECT DISTINCT ON (order_history.order_id) order_id,
order_history.creation_date  AS c_date
FROM work.order_history WHERE (order_history.state_id = ANY (ARRAY[30, 51,
63, 136, 195, 233, 348])) AND order_history.is_false = 0
ORDER BY order_history.order_id DESC;

EXPLAIN ANALYZE output:

 Unique  (cost=672007.46..1519683.55 rows=206423 width=12) (actual
time=1701.420..3439.095 rows=2049357 loops=1)
   ->  Gather Merge  (cost=672007.46..1502346.48 rows=6934827 width=12)
(actual time=1701.419..2989.243 rows=6891551 loops=1)
         Workers Planned: 4
         Workers Launched: 4
         ->  Sort  (cost=671007.40..675341.67 rows=1733707 width=12)
(actual time=1657.609..1799.723 rows=1378310 loops=5)
               Sort Key: order_id DESC
               Sort Method: external merge  Disk: 38960kB
               Worker 0:  Sort Method: external merge  Disk: 31488kB
               Worker 1:  Sort Method: external merge  Disk: 36120kB
               Worker 2:  Sort Method: external merge  Disk: 31368kB
               Worker 3:  Sort Method: external merge  Disk: 36152kB
               ->  Parallel Seq Scan on order_history
 (cost=0.00..473993.00 rows=1733707 width=12) (actual time=0.041..1211.485
rows=1378310 loops=5)
                     Filter: ((is_false = 0) AND (state_id = ANY
('{30,51,63,136,195,233,348}'::integer[])))
                     Rows Removed by Filter: 3268432
 Planning Time: 0.405 ms
 Execution Time: 3510.433 ms

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