b4398fee_SQL_Statement_Execution__Meaning
[Option] O [Value] 3 [Meaning] 
The tables are reordered so that where possible child tables are accessed before parent tables that are mentioned in a condition, and otherwise those which are mentioned most often in the WHERE clause are accessed first. Tables mentioned equally often are sorted so that where possible tables which are used for grouped or sorted fields are accessed earliest.
SQL Statement Execution
Meaning