> The DB will tell you what it's doing if you ask, it's all easily investigated. It will tell you _what_ it's doing, but not _why_ it's doing it. Unraveling th

> The DB will tell you what it's doing if you ask, it's all easily investigated. It will tell you _what_ it's doing, but not _why_ it's doing it. Unraveling the mysteries of the query planner is a dark art that is still firmly in the realm of graybeards.