Occurs when the sort operation on an executing query does not fit into memory. This event is not generated for sort operations ...

Occurs when the sort operation on an executing query does not fit into memory. This event is not generated for sort operations caused by index creation, only for sort operations in a query. (For example, an Order By in a Select statement.) Use this event to identify queries that perform slowly because of the sort operation, particularly when the warning_type = 2, indicating multiple passes over the data were required to sort