Online Documentation for SQL Manager for Oracle
Viewing query plan
Using SQL Manager for Oracle, you can view the plan for each of the queries created and executed in the application. The query plan is available within the corresponding Plan tab.
To view the Plan of a query, open Design Query and use the Explain query item of the Navigation bar.
The Plan tab allows you to view the sequence of actions performed by the database server in the process of the query execution, and the amount of system resources used for the query execution.
If necessary, you can specify that the Plan tab appears automatically upon query execution in Design Query: select the Explain query on execution option available within the Tools | Design Query section of the Environment Options dialog.