Implementation Guide › Planning and Design › Design › Data Modeling (Data Source Expert, Business Logic Expert) › Guidelines for Defining Registrations

Guidelines for Defining Registrations

Use the following guidelines for defining registrations:

• Never set the registration to be only by Event Type. Even if the calculation requirement does not require Resource filtering, add the Resource filtering at least on the Resource type.

  For example, where calculating overall average response times of application servers, the Response Time Event needs to be reported only when it is associated with one of these application servers (that is, where the Resource Type of the Resource associated with the event is 'Application Server'). In such a case, the system may have other types of Resources such as sites or routers using the same Event Type to send data, so to distinguish between them. The Resource Type to be reported on ('Application Server') should be added to the registration command as the 3^rd parameter.

  The reason for this is that when a Resource change occurs, the Engine marks the Metrics associated with this Resource as 'requiring a recalculation'. In a case where the Metric registers only by Event type, the Engine views the Metric as registered to all Resources and therefore marks it for recalculation upon activation of each Resource. To avoid this, you must use the 'optional' 3^rd parameter of the resource type.

• The most efficient method for registration is by Contract Party and Service. Arranging the Resources in this manner enables expressing the logical relationship between the data layer and the business layer in the system. Registering resources through these entities does not require changes to the formulas when used in different Contracts or when used for different Services. The Metric context contract and service defines the relevant contract party and service. The Business Logic formulas defined in this type of registration are easily reusable because they do not require any changes in the registration.

Note: Registrations can also be handled by the Registration tab within each Metric. This interface provides a wizard which guides you through the process for the selected metric.