1. A method, comprising: requesting from a database management system a first execution plan for a first version of a structured query language statement; loading the first execution plan for the first version of the structured query language statement into a first directed graph tree structure comprising a plurality of nodes; scanning, using a processor, the first directed graph tree structure to determine whether a full table scan for accessing requested data is represented by at least a one of the plurality of nodes of the directed graph tree structure; and determining whether a database index is available for the accessing the requested data in lieu of the full table scan; and responsive to determining that the full table scan for accessing the requested data is represented by the at least one of the plurality of nodes of the directed graph tree structure and responsive to determining that the database index is available for accessing the requested data, outputting a first indicator that indicates a fault condition.