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The RAC database also uses feedback on the amount of memory used for a single server node in a server pool If there is too much work for the memory on the node, that node will temporarily stop accepting new connections until the demand for memory is decreased
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The Oracle Database includes other ways to provision database server resources, such as Database Resource Manager, which is described later in this chapter, and instance caging, implemented through Database Resource Manager, which allows you to specify how to allocate CPU resources between different database instances that may be sharing a single physical server
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A RAC database gives you the ability to take a pool of resources and use them as if they were a single machine In today s computing environment, virtualization provides a different approach the ability to share a pool of resources offered by a single physical machine among multiple virtual machines RAC One is a flavor of RAC that delivers the same type of benefit An instance using RAC One runs on a single node If that node should fail, the RAC One instance fails over to another node Since the RAC One database was only running on a single instance, the underlying database will still need to be recovered, but the RAC One software handles this recovery, as well as the failover to another node, transparently, reducing downtime by eliminating the need for administrator intervention You can think of RAC One as a way to implement virtual database nodes rather than virtual machines The purpose-driven nature of RAC One makes administration easier, and the elimination of a layer of virtual machine software should deliver better performance with the same hardware
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Although RAC was introduced before the advent of the Exadata Database Machine, and although there is no absolute requirement that you use RAC on the Machine, the two offerings are made for each other In fact, the Database Machine is sometimes referred to as a grid in a box, and RAC is the foundation of that grid
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The Exadata Database Machine includes a number of physical database servers in the same cabinet, so using RAC to pool the resources of those servers is a natural complement The Database Machine is also configured for optimal RAC performance as it provides a high-bandwidth interconnect between the database servers In addition, since the Exadata Database Machine can be used as a platform for consolidation, there may be scenarios when RAC One is appropriate for this environment
Automatic Storage Management
Real Application Clusters was a big step forward for the Oracle database With RAC, you could combine multiple physical database servers together to act like a single database, offering a new way to deploy and scale database servers Automatic Storage Management, or ASM, extends a similar capability for storage ASM was introduced with Oracle Database 10 g, and provides a way to combine multiple disks into larger logical units, reducing storage costs and simplifying management In addition, like RAC, ASM delivers additional benefits, such as improving performance and availability and simplifying a number of key management tasks
What Is ASM
ASM is storage management software, providing a single solution for a cluster file system and volume management ASM manages a collection of storage disks, simplifying the interface to those disks for database administrators ASM eliminates the need for third-party software like volume managers and file systems for Oracle database environments ASM runs as an instance, just like an Oracle database, and the ASM instance has some of the same organization as a database instance Each database server that will use ASM must have a single ASM instance, which can manage storage for one or more database instances on the node The ASM instance maintains metadata about storage The ASM instance uses this information to create an extent map that is passed to the database instance, which removes the necessity of the database instance to go through the ASM instance for access The database instance interacts with ASM when files are created or modified, or when the storage configuration is modified by adding or dropping disks This implementation gives ASM the
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