Viewing an execution plan

Use Interactive SQL to display an UltraLite plan that summarizes how a prepared statement is to be executed. The text plan is displayed in the Interactive SQL Plan Viewer.

Prerequisites

There are no prerequisites for this task.

Context and remarks

In UltraLite, an execution plan is strictly a short textual summary of the plan. No other plan types are supported. However, being a short plan, it allows you to compare plans quickly, because information is summarized on a single line.

Task

Click Tools » Plan Viewer.
In the SQL pane, type a query.
Click Get Plan to generate a plan for the specified SQL statements.

Results

The text plan appears in the lower pane of the Plan Viewer.

Example

Consider the following statement:

SELECT I.inv_no, I.name, T.quantity, T.prod_no
FROM Invoice I, Transactions T
WHERE I.inv_no = T.inv_no

This statement might produce the following plan:

join[scan(Invoice,primary),index-scan(Transactions,secondary)]

The plan indicates that the join operation is completed by reading all rows from the Invoice table (following an index named primary). It then uses the index named secondary from the Transactions table to read only the row whose inv_no column matches.

Viewing an execution plan

Task

See also