title: Can we check if table in bigquery is in locked or DML operation is being performed
body: <p>There is a BQ table which has multiple data load/update/delete jobs scheduled in. Since this is automated jobs many of it are failing due to concurrent update issue. 
  I need to know if we have a provision in BigQuery to check if the table is already locked by DML operation and can we serialize the queries so that no job fails</p>