Expert Oracle Exadata - Parent Directory

CHAPTER 7 RESOURCE MANAGEMENTFigure 7-19. I/O operations scheduled per second, by consumer groupOther Processes Managed by IORMThere are a few internal processes managed by IORM that don’t quite fit anywhere else in this chapter sowe’ll discuss them here. These internal processes are:• Fast File Creation• ETL (extract, transform, load)• Recovery ManagerExadata provides a feature called Fast File Creation for creating and extending database datafiles. Itprovides extremely fast I/O for creating and growing files in the storage grid. Generally speaking, this is agood thing. But how does Exadata manage the priority of certain, low priority, highly I/O intensiveprocesses? The answer is IORM.Fast File CreationExadata provides a feature called Fast File Creation, which brings all the I/O resources of the storage cellsto bear in order to make quick work of creating and extending tablespace database files. But as youmight imagine, if run unchecked, Fast File Creation can steal valuable resources from other databasecritical, and business critical processes. To prevent this, the FASTFILECRE function, which performs FastFile Creation, is mapped to a hidden IORM consumer group and assigned a priority below that of allother database foreground and background processes. When the storage cells are busy, Fast File232