In the previous post in this series, I showed how my scripts xb.sql and xbi.sql (eXplain Better and eXplain Better, by sqlId) help you see Oracle execution plan details in a more complete way. Here are the features that I currently plan to cover: More detailed access/filter predicate info next to plan tree data (Part 1) More intelligent row-source level execution statistics presentation (Part 2, this post) Calculate Optimizer Cost misestimation factor and demo its effects (Part 3, coming soon...