The [SequentialExecutor](https://airflow.apache.org/docs/apache-airflow/stable/_api/airflow/executors/sequential_executor/index.html#airflow.executors.sequential_executor.SequentialExecutor) is the default executor when you first install airflow. It is the only executor that can be used with sqlite since sqlite doesn’t support multiple connections. This executor will only run one task instance at a time. For production use case, please use other executors.
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