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* Python psycopg transaction isolation level
@ 2006-02-28 18:27 Eugene Prokopiev <prokopiev@stc.donpac.ru>
2006-02-28 19:07 ` Re: Python psycopg transaction isolation level Michael Fuhr <mike@fuhr.org>
0 siblings, 1 reply; 2+ messages in thread
From: Eugene Prokopiev @ 2006-02-28 18:27 UTC (permalink / raw)
To: pgsql-interfaces
Hi,
I have a simple python script:
connection = psycopg.connect("host="+server+" dbname="+database+"
user="+login+" password="+password)
cursor_modify = connection.cursor()
cursor_modify.execute("update messages set flag=1 where flag=0")
connection.commit()
On running it sometimes I got:
psycopg.ProgrammingError: ERROR: could not serialize access due to
concurrent update
How can I setup isolation level for waiting end of executing other
transaction and execute update without any error?
--
Thanks,
Eugene Prokopiev
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Python psycopg transaction isolation level
2006-02-28 18:27 Python psycopg transaction isolation level Eugene Prokopiev <prokopiev@stc.donpac.ru>
@ 2006-02-28 19:07 ` Michael Fuhr <mike@fuhr.org>
0 siblings, 0 replies; 2+ messages in thread
From: Michael Fuhr @ 2006-02-28 19:07 UTC (permalink / raw)
To: Eugene Prokopiev <prokopiev@stc.donpac.ru>; +Cc: pgsql-interfaces
On Tue, Feb 28, 2006 at 09:27:29PM +0300, Eugene Prokopiev wrote:
> connection = psycopg.connect("host="+server+" dbname="+database+"
> user="+login+" password="+password)
> cursor_modify = connection.cursor()
> cursor_modify.execute("update messages set flag=1 where flag=0")
> connection.commit()
>
> On running it sometimes I got:
>
> psycopg.ProgrammingError: ERROR: could not serialize access due to
> concurrent update
psycopg's default isolation level is SERIALIZABLE. I think the way
to set the isolation level to READ COMMITTED is:
connection = psycopg.connect(...)
connection.set_isolation_level(1)
You'll find more psycopg expertise on the psycopg mailing list:
http://lists.initd.org/mailman/listinfo/psycopg
--
Michael Fuhr
^ permalink raw reply [nested|flat] 2+ messages in thread
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2006-02-28 18:27 Python psycopg transaction isolation level Eugene Prokopiev <prokopiev@stc.donpac.ru>
2006-02-28 19:07 ` Michael Fuhr <mike@fuhr.org>
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