From: Brian Fehrle <brianf@consistentstate.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: View with and without ::text casting performs differently.
Date: Wed, 18 Sep 2013 12:50:05 -0600
Message-ID: <5239F5DD.8090007@consistentstate.com> (raw)
In-Reply-To: <2215.1378492532@sss.pgh.pa.us>
References: <5229097C.4070401@consistentstate.com>
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<522A05E1.1070103@consistentstate.com>
<2215.1378492532@sss.pgh.pa.us>
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On 09/06/2013 12:35 PM, Tom Lane wrote:
> Brian Fehrle <brianf@consistentstate.com> writes:
>> On 09/05/2013 05:50 PM, Tom Lane wrote:
>>> I rather doubt that the now-explicit-instead-of-implicit casts have much
>>> to do with that. It seems more likely that you forgot to re-ANALYZE in
>>> the new database, or there are some different planner settings, or
>>> something along that line.
>> I have two versions of the view in place on the same server, one with
>> the typecasting and one without, and this is where I see the differences
>> (no ::text runs in 0.5ms and with ::text runs in 13 or so minutes with
>> nested loop), so it's all running off the same statistics on the data.
> Hm. Can you provide a self-contained example?
I'll see what I can do to recreate this with bogus data. It's sensitive
data that may just be some sort of anomaly in terms of the data
distribution that is causing it.
- Brian F
>
> regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: brianf@consistentstate.com, tgl@sss.pgh.pa.us
Subject: Re: View with and without ::text casting performs differently.
In-Reply-To: <5239F5DD.8090007@consistentstate.com>
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