On Aug 18, 2013 3:58 PM, "Jay Pipes" <jaypi...@gmail.com> wrote: > > On 08/18/2013 03:53 AM, Joshua Harlow wrote: >> >> I always just liked SQL as the database abstraction layer ;) >> >> On a more serious note I think novas new object model might be a way to go but in all honesty there won't be a one size fits all solution. I just don't think sqlalchemy is that solution personally (maybe if we just use sqlalchemy core it will be better and eject just the orm layer). > > > What is specifically wrong with SQLAlchemy's ORM layer? What would you replace it with? Why would use SQLAlchemy's "core" be better? > > I've seen little evidence that SQLAlchemy's ORM layer is the cause for database performance problems. Rather, I've found that the database schemas in use -- and in some cases, the *way* that the SQLAlchemy ORM is called (for example, doing correlated subqueries instead of straight joins) -- are primary causes for database performance issues.
>From what I have seen the issue is both the queries and the ORM layer. See https://bugs.launchpad.net/nova/+bug/1212418 for details. > > Note, I'm not speaking about database scalability issues but rather pure query performance... > > Best, > -jay > > >> On Aug 16, 2013, at 12:07 PM, "Jay Pipes" <jaypi...@gmail.com> wrote: >> >>> On 08/16/2013 02:41 PM, Mark Washenberger wrote: >>>> >>>> I think the issue here for glance is whether or not oslo common code >>>> makes it easier or harder to make other planned improvements. In >>>> particular, using openstack.common.db.api will make it harder to >>>> refactor away from a giant procedural interface for the database driver. >>> >>> >>> And towards what? A giant object-oriented interface for the database driver? >>> >>> -jay >>> >>> _______________________________________________ >>> OpenStack-dev mailing list >>> OpenStack-dev@lists.openstack.org >>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev >> >> >> _______________________________________________ >> OpenStack-dev mailing list >> OpenStack-dev@lists.openstack.org >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev >> > > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
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