This article was recently published at IOUG SELECT Journal Q4 2012.
"SQL Stats is important performance data that should be checked during the performance analysis of a SQL statement.
This article describes the method of using time analysis and resource consumption analysis together to study SQL Stats,
verifying whether a SQL statement has a performance issue, what if any is the possible root cause of
the SQL performance issue, and what are the corresponding SQL tuning strategies.
It also illuminates a series of SQL Stats patterns in Oracle 11g."