ironic/releasenotes/notes/change-db-access-pattern-fo...

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---
upgrade:
- |
The query pattern for the database when lists of nodes are retrieved has
been changed to a more efficient pattern at scale, where a list of nodes
is generated, and then additional queries are executed to composite this
data together. This is from a model where the database client in the
conductor was having to deduplicate the resulting data set which is
overall less efficient.
other:
- |
The default database query pattern has been changed which will result
in additional database queries when compositing lists of ``nodes``
by separately querying ``traits`` and ``tags``. Previously this was a
joined query which requires deduplication of the result set before
building composite objects.