OpenText Analytics Database 26.2.x – Working with query plans in MC

Mc: Accessing query plans in Management Console

Mon, 01 Jan 0001 00:00:00 +0000

You can access query plans in Management Console in two ways:

In the Detail page for query-related charts on the database's Activity page, click Explain next to a query to view a plan for that query.
Enter a query manually on the Explain page and click Explain Plan.

In both cases, the following window opens:

You can also enter the transaction ID and statement ID or browse running or completed queries in the Find a Query input window:

In the output window, you can perform the following tasks related to the query you entered:

Mc: Query plan view options

Mon, 01 Jan 0001 00:00:00 +0000

The Management Console provides two views for displaying query plans:

Path Information
Tree Path

Note

Query Plan Drilldown and Profile Analysis output views are only available when you run PROFILE.

You can change the query plan view using the icons on the bottom portion of the Explain page.

The Path Information view displays the query plan path. You can expand or collapse the view to see different levels of detail. To view metadata for a projection or a column, click the object name in the path output. A pop-up window displays the metadata, if it is available.

The

The Tree Path view details the query plan in the form of a tree. When you run EXPLAIN, the tree view does not contain any metrics because the query has not yet executed.

Mc: Expanding and collapsing query paths

Mon, 01 Jan 0001 00:00:00 +0000

The EXPLAIN window initially displays the full query plan as generated by the EXPLAIN command. Query plans can be lengthy, so you might want to modify the display so you can focus only on areas of interest:

Collapse All collapses all query paths, and displays only a summary of each path.
Expand All expands all query paths.
Click the first line of a path to display details for that path. To collapse that path, click its first line again.

For details about EXPLAIN command output, see EXPLAIN-Generated query plans.

Mc: Clearing query data

Mon, 01 Jan 0001 00:00:00 +0000

After you finish reviewing the current query data, click Clear All to clear the query text and data. Alternatively, to display information about another query, enter the query text and click Explain or Profile.

Mc: Viewing projection and column metadata

Mon, 01 Jan 0001 00:00:00 +0000

In the Management Console EXPLAIN window, when query paths are expanded in the Path Information view, Projection lines contain a projection name and Materialize lines contain one or more column names.

To view metadata for a projection or a column, click the object name. A pop-up window displays the metadata. The following image on the left shows example projection metadata and the image on the right shows example column metadata.

Note

Most system tables do not have metadata.

When you are done viewing the metadata, close the pop-up window.