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Spotlight on Oracle 11.0 - Getting Started Guide

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Impending Bottlenecks - Timed Statistics

Note: Available for Oracle 10.2 and later.

The Impending Bottleneck Predictions page contains a table of the categories of timed statistics that are likely to contribute to bottlenecks. Use the controls on this page to calculate and display potential bottlenecks in your Oracle database that in the future may affect database throughput and response time.

To open the Impending Bottleneck Predication page

For categories of timed statistics For a category of Wait Event
  1. Select the Spotlight on Oracle connection in the Spotlight Browser.
  2. Click Predictive Diagnostics | Identify Database Bottlenecks.

  1. Select the Spotlight on Oracle connection in the Spotlight Browser.
  2. Open the Activity | Waiting Events page.
  3. Select a category of events.
  4. Click Predictive Diagnostics.

Set bottleneck criteria

Control

Description

Perform an analysis of...

Select Real Data (your database) or Sample Data (to experiment with).

Note: Spotlight takes some time (typically about 10 days) to collect enough data to make valid predictions on the future performance of your Oracle instance. In the meantime use the prepared sample data to learn more about Predictive Diagnostics and how it works.

Within the processing period...

Select an activity period to use for your prediction. The more selective this is the better the prediction.

Tip: To define new processing periods or redefine an existing processing period see Peak Processing Periods.

For all collected data

or

For data collected since...

Click all or the date to open Impending Bottlenecks Oracle Job.

If you select a start date in Data Analysis Options then this text reads For data collected since....

Note: The start date should be a date for which recorded data exists. For example, you cannot select a date later than today's date. Use this setting to ignore data that occurred before a specific time.

Predict forward until...

Select an end date for the prediction.

Predictions for impending bottlenecks.

Impending Bottleneck Predictions displays projected statistics for potential bottlenecks on the database. These statistics are based on the details of the timed statistics collected by Predictive Diagnostics according to criteria set.

Column

Description

Bottleneck Prediction Image

The image displayed here corresponds to the most relevant bottleneck prediction for the timed statistic in this row.

   The color of the image represents the predicted severity of the timed statistic at the end-date.

The type of image reflects the shape of the prediction chart in either the Total Time or Average Time sub-page, and indicates the trend for the statistic, either as an average value or a percentage of total wait time, depending on the statistic. The chart style does NOT necessarily indicate that a problem exists.

Increasing at an increasing rate.

Decreasing at a decreasing rate.

Increasing at a constant rate.

Decreasing at a constant rate.

Increasing at a decreasing rate.

Decreasing at an increasing rate.

No prediction possible.

Analysis pending.

Timed Statistic

A category of the timed statistics that can signal bottlenecks.

Tip: To list the individual statistics, click the row. From Impending Bottlenecks select Details.

Avg Time Now

The average time taken NOW for events in this category, measured in milliseconds.

Avg Time Predicted

The predicted average time taken for events in this category at the end-date, measured in milliseconds.

% Total Time Now

The total time taken NOW for events in this category, measured as a percentage of the total time taken for all events.

% Total Time Predicted

The predicted total time taken for events in this category at the Predict forward until... date, measured as a percentage of the total time taken for all events.

Severity Now

A measure of the severity of the bottleneck now (0 = no bottleneck, 100 = severe bottleneck).

Severity Predicted

A measure of the severity of the bottleneck at the end date.

Statistic ID

Every timed statistic category is assigned an identifying value.

Total Time Now

The total time taken NOW for events in this category, measured in milliseconds.

Total Time Predicted

The predicted total time taken for events in this category at the end-date, measured in milliseconds.

Wait Rate Now

The number of waits per second NOW for events in this category.

Wait Rate Predicted

The predicted number of waits per second at the Predict forward until... date for events in this category.

Notes:

  • When the Spotlight application window is too small to show the tabs for all the sub-pages at the same time, Spotlight will indicate the hidden tabs with scroll arrows. Click a scroll arrow to display the hidden tabs.

Prediction details for selected bottlenecks

Detail Description
Every row in the Impending Bottlenecks Predictions table represents a category of timed statistics for which Spotlight has collected bottleneck data.

To view the list of all statistics in the category, click its row in the table and open the Details page. The Details page shows performance data for events that contribute to the bottleneck, and predicts how the performance will change in the future.

The Details page is only one of the pages displayed when you click a row in the Impending Bottleneck Predictions table. The Waits, Total Time and Average Time pages provide additional information on bottlenecks in the form of charts and explanatory text and, where possible, provide links to further information on those bottlenecks.

Show Waiting Events for the category of timed statistic

Right click a row and select Waiting Events. Spotlight opens the Spotlight on Oracle Activity | Waiting Events page with statistics in the category of the selected row.

Show Waiting Events for the timed statistic
  1. Select the row on the Impending Bottleneck Predictions grid.
  2. Click Details to list all statistics in the category.
  3. Right click a row (statistic) on the Timed Statistic Details grid and select Waiting Events.
  4. Spotlight opens the Activity | Waiting Events page for the statistic.
Change Spotlight Options for Predictive Diagnostics

Right click a row and select Predictive Diagnostics Options. This opens Predictions General Configuration.

 

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