*** This bug is a duplicate of bug 1485025 ***

Given this bug was reported before
https://review.openstack.org/#/c/213340/ landed then you wouldn't have
that fix, but it would be useful to know if it resolves your issue.

** This bug has been marked a duplicate of bug 1485025
   The simple-tenant-usage API should pull instance flavor attrs rather than 
system_metadata now

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  os-simple-tenant-usage performs poorly with many instances

Status in OpenStack Compute (nova):

Bug description:
  The SQL underlying the os-simple-tenant-usage API call results in very
  slow operations when the database has many (20,000+) instances. In
  testing, the objects.InstanceList.get_active_by_window_joined call in
  takes 24 seconds to run.

  Some basic timing analysis has shown that the initial query in
  nova/db/sqlalchemy/api.py:instance_get_active_by_window_joined runs in
  *reasonable* time (though still 5-6 seconds) and the bulk of the time
  is spent in the subsequent _instances_fill_metadata call which pulls
  in system_metadata info by using a SELECT with an IN clause containing
  the 20,000 uuids listed, resulting in execution times over 15 seconds.

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