Chapter 12 Runtime Monitoring

Using the Runtime Monitor

The Runtime Monitor allows you to monitor server events and statistics, which may help you anticipate and prevent server problems.

Starting the Runtime Monitor

1. Double-click the Servers icon.
2. Double-click the server you want to monitor.
   
   The Runtime Monitor can connect to other EAServer instances via an IIOP listener. The server configuration identifies the host and port number to which the Runtime Monitor attempts to connect.
3. Click the Runtime Monitor icon.

The Runtime Monitor displays the folders listed below. For each of the top-level groups, there are subgroup folders. Click the subgroup folder whose statistics you want to view.

• Packages - monitor events and statistics for a specific package, or for all packages on the server.
• Connection caches - monitor a specific connection cache or statistics for all caches.
• Network - monitor protocol-specific session information.

When viewing a subgroup's counters, you can change the view by selecting any of these options from the File menu:

• Refresh - refresh the display to obtain the latest counters.
• Per-Second - display the per-second values.
• Counter - display the accumulated value.
• View Values... - view the values in a separate dialog that automatically refreshes according to the refresh rate, which you can select from a drop-down list. If the group contains subgroups, expand those subgroups until you see the values.

If the subgroup contains counters, the current values of the counters display on the right side of the window.

There are two types of counters:

• Snapshot counters - represent values at a particular point in time that are likely to either increase or decrease. For example, number of sessions, number of instances active, number of active connections, and so on. Snapshot counters do not display information when set at the per-second rate; instead they display "N/A."
• Cumulative counters - represent values that always increment and never decrement. For example, number of invocations, number of connections opened, number of network requests, bytes read and written, and so on. Cumulative counters display both per-second and counter information.

Within each folder there are peak maximum and last maximum counters:

• Peak maximum counters - represent the total value since starting the server.
• Last maximum counters - represent the total value since starting the runtime monitor, and is not useful when there are multiple monitoring clients.

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