seelmann commented on issue #3885: [AIRFLOW-3001] Add index 'ti_dag_date' to taskinstance URL: https://github.com/apache/airflow/pull/3885#issuecomment-452806139 Thanks @ubermen for this fix. We experienced increasing load on our DB (Postgres 10, RDS m4.large, 1.7M rows in task_instance table) and slower task scheduling. After analysis this query was identified as cause. After creating the index load went down and tasks are scheduled fast again.
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