Expert Oracle Exadata - Parent Directory

CHAPTER 7 RESOURCE MANAGEMENTResource Manager ViewsOracle supplies a number of views that report configuration, history, and metrics for Resource Manager.Let’s take a look at a few of the views that are useful for reviewing and monitoring resources in yourDBRM configuration.V$RSRC_CONSUMER_GROUP: The V$RSRC_CONSUMER_GROUP view displays informationabout the active resource consumer groups. It also contains performance metricsthat are useful for tuning purposes. We’ll take a closer look at this view when wetest a resource plan later on in the chapter.V$RSRC_PLAN: This view displays the configuration of the currently active resourceplan.V$RSRC_PLAN_HISTORY: The V$RSRC_PLAN_HISTORY view shows historical informationfor your resource plans, including when they were activated and deactivated, andwhether they were enabled by the database scheduler or scheduler windows.V$RSRC_SESSION_INFO: This view shows performance statistics for sessions andhow they were affected by the Resource Manager.V$SESSION: The V$SESSION view is not specifically a Resource Manager view but itsRESOURCE_CONSUMER_GROUP field is useful for determining what resource group asession is assigned to.DBA_RSRC_CATEGORIES: This view displays the resource categories that areconfigured in the database. Categories are used by the I/O Resource Manager forcontrolling storage cell I/O allocation within a database.DBA_RSRC_CONSUMER_GROUPS: This view displays all the consumer groups defined inthe database.DBA_RSRC_CONSUMER_GROUP_PRIVS: This view reports users, and the resourcegroups to which they have been granted permission. A user must have permissionto switch to a consumer group before the session-to-consumer group mappingrules will work.DBA_RSRC_GROUP_MAPPINGS: This view lists all the various session-to-resourcegroup mapping rules defined in the database.DBA_RSRC_MAPPING_PRIORITY: This view reports the priority of session attributesused in resolving overlaps between mapping rules.DBA_RSRC_IO_CALIBRATE: This view displays the I/O performance metrics DBRMuses for I/O resource management. Maximum read rates are captured for I/Ooperations per second (IOPS), megabytes per second (MBPS), and latencies fordata block read requests.DBA_RSRC_PLANS: This view lists all resource plans and the number of plandirectives assigned to each plan in the database.DBA_RSRC_PLAN_DIRECTIVES: This view lists all resource plan directives, resourceallocation percentages, and levels defined in the database.184