Khrol commented on issue #5949: [AIRFLOW-5343] Add pool_pre_ping to SQLAlchemy URL: https://github.com/apache/airflow/pull/5949#issuecomment-527841440 > What difference in performance/behaviour does enabling this btw? When might a user want it on or not? ``` The approach adds a small bit of overhead to the connection checkout process, however is otherwise the most simple and reliable approach to completely eliminating database errors due to stale pooled connections. ``` Connection to Airflow backend should not be a bottleneck in Airflow performance. Meanwhile, we are observing flakiness there in our local infrastructure so such overhead might be a good tradeoff.
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