The analysis tools can help you understand the structure
of an SQL statement and the access path for that statement.
Formatting SQL statements
The Query Tuner Workflow Assistant can
format an SQL statement so that you can better understand the structure
of that statement.
Generating visual representations of access plans
The Query Tuner Workflow Assistant can
display the access plan for a statement as a diagram. The diagram
provides cost and cardinality estimates for each step in the plan.