A method, apparatus, system, and signal-bearing medium that, in an embodiment, collect previous and current statistics based on previous and current access plans, respectively, and a query. The previous and current statistics are compared in response to an event, and the differences between the previous...http://www.google.es/patents/US8161038?utm_source=gb-gplus-sharePatente US8161038 - Maintain optimal query performance by presenting differences between access plans
Maintain optimal query performance by presenting differences between access ...
