Re: explain analyze output: 0 rows, 1M loopa

From: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>
To: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
Cc: "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: Re: explain analyze output: 0 rows, 1M loopa
Date: 2017-11-01 19:19:21
Message-ID: CAKFQuwZ2HDDP+78CAytgZ0hsDa-7AjVuur_-FDVY8TWKLCLgCQ@mail.gmail.com
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On Wed, Nov 1, 2017 at 11:59 AM, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
wrote:

> So some of my output from an explain analyze here has a line that says
> this:
>
> ex Scan using warranty_order_item_warranty_order_id_idx on
> warranty_order_item woi_1 (cost=0.57..277.53 rows=6 width=137) (actual
> time=0.110..0.111 rows=0 loops=1,010,844)
>

​Not my strong suit but, I'm pretty sure that reads: "The index was queried
1M+ times and none of those inqueries resulted in a record being found".
IIUC I'd be wondering why some form of hash join wasn't used...

David J.​

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