> #### Asynchronous alerts

> An asynchronous alert is generated by a resource the moment a specific condition is detected, regardless of the polling interval set for that resource. Many asynchronous alerts identify violations related to mission-critical and time-sensitive activities; others, such as AS_BrokerNormalShutdown or DB_AgentStartup are more as confirmations of normal, or expected, operational status.

> For example, some common mission-critical conditions for which you can define an asynchronous alert include:

> - Database abnormal shutdown.
> - FathomTrendDatabase Unavailable.
> - AppServer added.

> Other events for which you can define asynchronous alerts are more time dependent. For example, if a running job has not completed in a specified period of time, you can be notified by an asynchronous alert. This situation could indicate that the job is either runaway or hung. In these types of instances, the firing of an asynchronous alert would inform you immediately of the situation so that you could take appropriate action.

> ##### Example: Reviewing asynchronous alert fields

> Figure 1–2 shows a sample rule definition section of a resource monitoring plan. This example shows the alert severity and the action currently associated with a database agent abnormal shutdown condition.

> Figure 1–2: Sample asynchronous alert-related data

> All asynchronous rules also have an Always throw new alert field. If you retain the default check mark in this field, Fathom triggers a new asynchronous alert of this type each time it detects that this rule is violated. Given the sample data shown in Figure 1–2, Fathom will trigger a unique alert each time a database agent shuts down in an abnormal manner. You can review each of these alert instances on the Alert Detail Summary page. If you clear the value in this field, Fathom triggers this alert once, so that an alert message does not display in the user interface each time the alert is triggered. However, even if you suppress this alert display, Fathom increments the Occurrence count field on the Alert Detail Summary page on a subsequent occurrence.

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