ViewPoint Manual

Functional Description
ViewPoint Manual—426801-001
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Current and Historical Modes
order received. The Event Management Service detects that new messages are in the log
and accordingly forwards the next message in order to the ViewPoint primary-events
cache. This forwarding of messages causes the oldest message to roll off the other end
of the cache if the cache is full of event messages.
If you are displaying the END page of current events, the newest message appears as the
16th message on your screen. Meanwhile, a new request is returned to the Event
Management Service to get whatever event message is next in order.
Figure 5-15 shows the basic mechanism for historical mode. This mode can be used
only with your alternate-events cache. Unlike the primary-events cache, the alternate-
events cache is not shared; it belongs to you as long as you are running ViewPoint. (You
can also use this alternate-events cache for other special views of events, as described
later in this section.)
You use the historical mode to examine past events for problem analysis and diagnostic
purposes. It provides access to events older than those in the primary-event cache
(which is only 20 pages or so, depending on your configured size). As indicated in
Figure 5-15, event messages can be retrieved from the current-events log file set or from
one of several other event logs (such as archived logs or logs belonging to a collector
other than $0 on your local node). You can specify other event logs in the field called
Collector or Log File on the Event Configuration screen for alternate events.
To use historical mode for the current log set, specify a starting date and time in the field
“After:” in the Event Configuration screen. If the date is earlier than the dates recorded
in the file that EMS is currently using for new events, EMS locates the appropriate log
file elsewhere in the current log set. Then, when it has found the starting point in the
required file, EMS begins to retrieve error messages from that point, one by one, and
delivers them to the ViewPoint application for copying into your alternate-events cache.
This overwrites any previous contents in that cache.
If you specify another collector or log file in the alternate event configuration, EMS
similarly retrieves events from the specified date and time in the log.
Figure 5-15. Retrieving and Displaying Events in Historical Mode
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