Parts of a Query Plan

The graphic representation of a query plan is a tree structure that provides the details of how DataDirect XQuery will execute the query for which the plan was generated. The query plan tree diagram is read-only, though it does provide navigation and formatting features. You can also print and save the query plan as HTML.

In addition to the Plan node, the query plan tree can include Adaptors, Global Variables, and Local Functions nodes. These nodes are described in the following table.

You can navigate the tree to check where variables are defined and where they are referenced. For example, you can navigate from one adaptor's definition to its references and vice-versa.

To navigate the tree, you can

Query Plan Toolbar

The query plan toolbar has buttons that help you navigate the variables defined in your XQuery code. These buttons are described in the following table.

You can change the font size used to display query plan text and symbols by right-clicking a tree node and selecting the font size you wish to use. Changes to font size affect the entire query plan, but they are not saved when you save the query plan as HTML.

Saving a Query Plan as HTML

You can save a query plan as an HTML document; you might wish to do this for review or presentation purposes, for example.

To save a query plan as HTML:

Alternative: Click the Save Plan button on the Plan tab.

The Save As dialog box appears.