> ### Understanding and using database rules

> Fathom supplies each managed database with a default rule set. Fathom also provides over 20 different database rules that you can define for a monitoring plan. These rules allow you to customize your database monitoring plans so that Fathom monitors your databases for specific conditions.

> Figure 1–2 shows the Available Rules page.

> Figure 1–2: Available Rules page

> Only the rules that are not already part of the monitoring plan appear in the list. When you select any of these rules, the specific criteria associated with each rule appear. You can modify the default values associated with each individual rule.

> To see a list of rules associated with a monitoring plan, click Edit on the Monitoring Plan page. The Edit Monitoring Plan page appears.

> For each rule shown in the Rules selected for this plan section, the following details are provided:

> - A colored dot, preceding the rule name, that indicates the status associated with each rule. See the Resource Monitoring Guide for general resource status information.
> - The status represented by the colored dot.
> - The alert severity for each rule that has failed.

> Table 1–2 lists possible rule status values.

> .

> Table 1–2: Resource status legend
> Status | Dot color | Description
> --- | --- | ---
> Pass | Green | The resource monitor is currently working.
> Fail | Red | The most recent test involving the associated resource failed. This includes statuses such as tardy, timeout, unreachable, and so forth. Check the Alert Summary page or the specific monitor for possible alert details. This status can also identify an internal error that prevents the resource from being monitored.
> Not checked | Yellow | The resource monitor's status is currently unknown. For example, if system startup has just occurred, it is possible that the resource has not yet been polled.
> Not running | Blue | The resource is currently not running. Watch resources such as databases and servers for this status, as they must be running before you can monitor them.
> Disabled | Dark gray | The resource monitor has been disabled and is not currently monitoring a resource.
> Inactive | White | There is no active monitoring plan.
> Offline | Light gray | The resource is currently offline.

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