Comment 1 for bug 1308715

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Vish Ishaya (vishvananda) wrote : Re: Deadlock on quota_usages due to misisng index

alternatively we could clean up the _get_user_quotas and _get_project_quotas to be a single query:

https://github.com/openstack/nova/blob/0e080bdcdbf44286f2e01a4546378442580dbce5/nova/db/sqlalchemy/api.py#L3033