Mike, this is interesting stuff.
Let's say I use isolation_level as serializabe. Is there a counterpart
in performance? If yes, is there something I can do to counter weight?
ie. bigger connection pool, stream_results (psycopg), etc.
Cheers,
Richard.
On 04/26/2013 11:02 AM, Michael Bayer wrote:
you can make a Session like this:
conn = engine.connect().execution_options(isolation_level='SERIALIZABLE')
session = Session(bind=conn)
# work with session
session.commit()
isolation level is per-transaction.
the default is not set by SQLAlchemy it depends on how your database
is configured.
On Apr 26, 2013, at 7:48 AM, sajuptpm <sajup...@gmail.com
<mailto:sajup...@gmail.com>> wrote:
Hi Michael Bayer,
Is there any way to dynamically change Transaction Isolation Level ??
I want to do it only for a particular operation. So I can't set it at
"Engine" or "Connection" Level, right ??
I am using turbogears + Sqlalchemy with defaultisolation_level.
What is the defaultisolation_level ??
=================
Also tried DBSession.expire_all() and DBSession.expunge_all(), but
not getting Updated row in waiting transaction.
http://docs.sqlalchemy.org/en/rel_0_8/orm/session.html#sqlalchemy.orm.session.Session.expire_all
http://docs.sqlalchemy.org/en/rel_0_8/orm/session.html#sqlalchemy.orm.session.Session.expunge_all
Thanks,
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