Re: how to improve perf of 131MM row table?

From: AJ Weber <aweber(at)comcast(dot)net>
To: Claudio Freire <klaussfreire(at)gmail(dot)com>
Cc: Shaun Thomas <sthomas(at)optionshouse(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: how to improve perf of 131MM row table?
Date: 2014-06-26 15:38:53
Message-ID: 53AC3E8D.8040106@comcast.net
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I noticed this too. I am trying to find where the actual SQL is
generated, and I am seeing if this is an artifact of Hibernate.

Will test the same query without the quotes as you recommend. (But I
don't know where to fix that, if it is the actual issue, unfortunately.)

On 6/26/2014 11:35 AM, Claudio Freire wrote:
> On Thu, Jun 26, 2014 at 10:26 AM, AJ Weber <aweber(at)comcast(dot)net> wrote:
>> OK, the sample query is attached (hopefully attachments are allowed) as
>> "query.sql".
>> The "master table" definition is attached as "table1.sql".
>> The "detail table" definition is attached as "table2.sql".
>> The EXPLAIN (ANALYZE, BUFFERS) output is here:
>> http://explain.depesz.com/s/vd5
>
> I think the problem is that you're sending strings in the ids, instead
> of integers.
>
> Remove the quotes, leave only the numbers. That will make pg able to
> infer that node.id = prop.node_id means it can also use an index on
> alf_node_properties.
>
> I think.
>
> Try.

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