Обсуждение: transaction isolationa level - SERIALIZABLE

On 05/13/2013 02:22 AM, Marcin Krawczyk wrote:
> Hi list,
>
> I have some problems with SERIALIZABLE isolation level, namely my users
> are plagued with concurrency errors. As of postgres 9.1 (which I'm
> running) there has been a change to SERIALIZABLE logic, unfortunately my
> application has not been updated to work with the new logic. I don't
> have an access to it's code and the only thing I can do is to report the
> issue to the authors. But before I do it, since I don't actually
> need SERIALIZABLE for my use, is it possible to have transactions always
> run in default READ COMMITTED mode, regardless of application level SET
> SESSION CHARACTERISTICS AS TRANSACTION command ... ? (like e.g in
> postgres 8.1 where SERIALIZABLE = READ COMMITED)

I don't think so:

http://www.postgresql.org/docs/9.1/interactive/config-setting.html

"Furthermore, it is possible to assign a set of parameter settings to a 
user or a database. Whenever a session is started, the default settings 
for the user and database involved are loaded. The commands ALTER ROLE 
and ALTER DATABASE, respectively, are used to configure these settings. 
Per-database settings override anything received from the postgres 
command-line or the configuration file, and in turn are overridden by 
per-user settings; both are overridden by per-session settings.

>
>
> regards
> mk


-- 
Adrian Klaver
adrian.klaver@gmail.com