Method and system for transparently caching and reusing query execution plans efficiently

摘要

A method and system for transparently caching and reusing database query execution plans. The method and system include caching a first query that contains a first constant. A first query is associated with an execution plan that represent the first constant with a parameter name. The method and system further include receiving a new query that contains a second constant and comparing the new query with the first query. A match is determined to exist even when the second constant fails to match the first constant. Upon a match, the first query execution plan is reused by substituting the parameter name in the query execution plan with the second constant from the new query, thereby avoiding generating a new query