Expert Oracle Exadata - Parent Directory

CHAPTER 7 RESOURCE MANAGEMENTFigure 7-11. An Intradatabase I/O resource planIn Figure 7-11, we see the calls to DBMS_RESOURCE_MANAGER that created our resource plan andplan directives for the SCRATCH and SNIFF databases. These directives are used to assign CPU and I/Oallocation for the resource groups APPS, REPORTS, MAINTENANCE, and OTHER_GROUPS. When the DAYTIME planis activated, its definition is sent to cellsrv on the storage cells. When cellsrv receives the resourceplan, it generates an Intradatabase IORM Plan, configures I/O queues for each consumer group, andbegins to manage I/O resources.Bringing It All TogetherAs discussed earlier, each of the three IORM management methods may be used individually or incombination. Let’s take a look at how all three methods work together to manage I/O. Now, this is thepart where your college accounting professor would say “each lesson builds on the last, so if you skippedclass last week, you may feel a little lost today.” In this exercise, we’ll be using all of the elements ofDBRM and IORM we’ve discussed in this chapter. To avoid confusion and save you the trouble of215