Viewing history data

You can view history data for threads, locking conflicts, Statistics, and system parameters. This data is stored as snapshots.

History data is useful, for example, if you want to examine events that lead to or follow an exception without recreating the situation.

The OMEGAMON® Collector must be enabled for collecting history data. The data is then collected at intervals that you defined during installation.

For information about setting up the OMEGAMON Collector to collect history data, see Configuration and Customization.

You can display history data in the Thread Summary, Statistics Details, System Health, and System Parameters window, and in all windows dealing with threads involved in a locking situation.

To view history data:
  1. Click View > History.

    The history slider is activated.

    The slider is divided into units where each unit stands for the date and time at which a snapshot was collected. The timestamp above the slider indicates the date and time of the snapshot at the current slider position. The timestamps below the slider show the time range through which data is available in history mode. This is useful, for example, if you zoom the time interval displayed to you.

  2. To view the data of a specific snapshot, do one of the following:
    • Move the slider to the date and time you want.
    • Click View > History Settings. A window is displayed on which you can specify the date and time of the snapshot data you want. Click OK to get the snapshot data.
    • To view the next snapshot, click the right arrow (→) or View > Forward. To view the previous snapshot, click the left arrow (←) or View > Back. You can repeat these commands until you have reached the snapshot you want.
    • If the slider contains too many units for you to move the slider to an exact date and time, you can decrease the time interval shown by clicking the plus (+) sign above the slider as often as you need. To increase it again, click the minus (-) sign.

To display the current data again, click View > History again to deactivate the history slider.

Restriction: When you view SQL statements in the dynamic SQL cache in history mode, you cannot define a filter. For more information about SQL statements data, refer to Viewing the SQL statements in the dynamic SQL cache.