Working with the System Overview window

The System Overview window shows the main performance information about the DB2® systems that you monitor and to which you are logged on. From this window, you can access all monitoring functions that are supported by Performance Expert.

You can view performance information for all DB2 systems or for a specific DB2 system. If a member is in DSG, you can view the information for each member. Figure 1 shows the KPIs page of the System Overview window after you logged on to a DB2 subsystem.

Figure 1. System Overview window
System Overview window

The folders pane on the left lets you select the information level. The contents pane on the right shows the performance information for the selected information level. The performance information is shown on the following tabbed pages:

  • The KPIs page shows the counters that are key performance indicators (KPIs) for the selected information level. Many of these counters have cumulative values, where the delta between the values of the last two snapshots is calculated.

    When you move the cursor over a KPI, hover help is displayed, which contains a short description of the KPI. Double-clicking a KPI takes you to the pane or page of the Statistics Details or System Parameters window that contains this counter. The counter is then highlighted in green.

  • The Data Views page shows the performance graphs for the selected information level. Performance graphs show Statistics information in graphical format. You create these performance graphs as data views in the System Health window and make them available in the System Overview window. When you click and move the cursor over a data view, the values for the counters that are represented by the data view are shown.

    To open the pane or page of the Statistics Details that contains the counters in the data view, right-click the data view and then select Show in Statistics Details. To open the System Health window, in which you created the data view, right-click the data view and then select Show in System Health.

  • The Exceptions page shows the last 10 periodic exceptions and the last 10 event exceptions for the selected information level.

    To view more details on an event exception or a periodic exception, do one of the following:

    • Click the exception. The exception details are shown at the bottom of the page.
    • Double-click the exception. The appropriate Details window opens.
    • Delete link removes the entry from the table.
    • New exceptions are shown in red. Exceptions that you have double-clicked to display details are shown in grey.

The toolbar buttons at the top of the window take you directly to the monitoring functions.

Specific icons and colors indicate whether the value of a counter falls below or above a warning or problem threshold. Event exceptions are also indicated by an icon. You are only informed of a warning or problem if the warning or problem threshold is active and if you activated the threshold set that contains this warning or problem threshold. For more information, refer to Processing periodic exceptions.

The data in the System Overview window is refreshed at the rate that you specify for a DB2 system.