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From: Andy Colson <andy@squeakycode.net>
To: Kenneth Marshall <ktm@rice.edu>
Cc: Richard Broersma <richard.broersma@gmail.com>
Cc: Justin Pitts <justinpitts@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Compared MS SQL 2000 to Postgresql 9.0 on Windows
Date: Tue, 07 Dec 2010 14:23:16 -0600
Message-ID: <4CFE97B4.8090708@squeakycode.net> (raw)
In-Reply-To: <20101207201028.GE4028@aart.is.rice.edu>
References: <378e24d1e3af88a49fbbb7c4d26f441a@mail.gmail.com>
	<4CFE7964.80206@squeakycode.net>
	<AANLkTi=HiO8ErFwzqBvgjXXHRUMKeUWqCpL-p9Y+oL_-@mail.gmail.com>
	<4CFE8E59.2010505@squeakycode.net>
	<AANLkTin4K86j2-GOUfmdXQ8UKv_j9V8ZRiRBEbbXj+jc@mail.gmail.com>
	<20101207201028.GE4028@aart.is.rice.edu>

On 12/7/2010 2:10 PM, Kenneth Marshall wrote:
> On Tue, Dec 07, 2010 at 11:56:51AM -0800, Richard Broersma wrote:
>> On Tue, Dec 7, 2010 at 11:43 AM, Andy Colson<andy@squeakycode.net>  wrote:
>>
>>> In PG the first statement you fire off (like an "insert into" for example)
>>> will start a transaction. ?If you dont commit before you disconnect that
>>> transaction will be rolled back. ?Even worse, if your program does not
>>> commit, but keeps the connection to the db open, the transaction will stay
>>> open too.
>>
>> Huh - is this new?  I always thought that every statement was wrapped
>> in its own transaction unless you explicitly start your own.  So you
>> shouldn't need to commit before closing a connection if you never
>> opened a transaction to begin with.
>>
>>
>> --
>> Regards,
>> Richard Broersma Jr.
>>
>
> The default of autocommit unless explicitly starting a transaction with
> BEGIN is the normal behavior that I have seen as well.
>
> Cheers,
> Ken

Crikey!  You're right.  I need to be more careful with my assumptions.

I maintain that people need to be more careful with pg transactions. 
I've seen several posts about "idle in transaction".  But its not as bad 
as I made out.  My confusion comes from the library I use to hit PG, 
which fires off a "begin" for me, and if I dont explicitly commit, it 
gets rolled back.

sorry, it was confused between framework and PG.

-Andy



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