Message-ID: <4F886713.5020306@pinpointresearch.com>
Date: Fri, 13 Apr 2012 10:49:07 -0700
From: Steve Crawford <scrawford@pinpointresearch.com>
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US;
	rv:1.9.2.27) Gecko/20120216 Lightning/1.0b2 Thunderbird/3.1.19
MIME-Version: 1.0
To: Claudio Freire <klaussfreire@gmail.com>
CC: Eyal Wilde <eyal@impactsoft.co.il>, pgsql-performance@postgresql.org
Subject: Re: scale up (postgresql vs mssql)
References: 
 <CAMiEbcj+6ViLiAX0C3+VzhVGt5ZedMh8KCE1JTgXgEVUq+GeNw@mail.gmail.com>
	<CAGTBQpYga9Uo4n=qUPyYOkuzW+2MoDYoRnBF53jvb546=Hbbqg@mail.gmail.com>
	<4F885604.6080404@pinpointresearch.com>
	<CAGTBQpbB+UpeCkac6J7F8CrO4kapMvBK-zp6yg9j5utmBG-Xgg@mail.gmail.com>
In-Reply-To: 
 <CAGTBQpbB+UpeCkac6J7F8CrO4kapMvBK-zp6yg9j5utmBG-Xgg@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

On 04/13/2012 09:43 AM, Claudio Freire wrote:
> On Fri, Apr 13, 2012 at 1:36 PM, Steve Crawford
> <scrawford@pinpointresearch.com>  wrote:
>> If they are permanent tables used for temporary storage then making them
>> unlogged may be beneficial. But actual temporary tables *are* unlogged and
>> attempting to create an unlogged temporary table will raise an error.
> Interesting, yes, I was wondering why PG didn't make temp tables
> unlogged by default.
>
> Then, I guess, the docs[0] have to mention it. Especially due to the
> error condition. Right?
>
> [0] http://www.postgresql.org/docs/9.1/static/sql-createtable.html
>
Well, the fact that temporary and unlogged cannot be simultaneously 
specified *is* documented:

CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF 
NOT EXISTS ] table_name

But it would probably be worth adding a note under the description of 
temporary tables that they are, in fact, unlogged.

Cheers,
Steve