dba_queue_schedules

In the next section, information will be presented on the rule related views.

Rule and Rule Set Related Views

Figure 7.5 shows the rule and rule related views in a single glance. Rules are the key components that control the flow of the data and the filtering logic. The description of each of the view follows in the text of this section.

Figure 7.5 Rule and Rule Set related views

 

v$rule

This view displays rule statistics. This view has a row for every rule loaded into shared memory.

Important statistics that can be obtained from the v$rule view are:

• true_hits – This is the number of times the rule evaluated to TRUE.
   

• maybe_hits – This is the number of times the rule evaluated to MAYBE.
   

• sql_evaluations – This is the number of evaluations of the rule that were performed by issuing SQL.

v$rule_set

This view displays rule set statistics. This view has a row for every rule set loaded into shared memory. This view can be queried to display general information about rule set evaluations that have occurred since the database instance last started.