You can store the various file types in Oracle ASM disk groups, including:An Oracle ASM instance has a System Global Area (SGA) and background processes that are similar to those of Oracle Database.
These are as follows.By the way, we said Automatic Storage Management introduced with 10g, but this does not mean that the File System is over. This capability simplifies the integration of Oracle ASM into pre-existing environments.This section describes Oracle ASM disk group administration and it contains the following topics:When Oracle ASM allocates an extent for a mirrored file, Oracle ASM allocates a primary copy and a mirror copy. If there are several database instances for different databases on the same node, then the database instances share the same single Oracle ASM instance on that node. For example, if a disk group has 5 disks, the data is split at the extent level and distributed to 5 disks. Multiple nodes that are not part of an Oracle ASM cluster cannot share a disk group.You can add a disk to an existing disk group to add space and to improve throughput.When you create a disk group, you specify an Oracle ASM disk group type based on one of the following three redundancy levels:Examples of Oracle ASM disks include:The disks that belong to a disk groupOracle Automatic Storage Management (Oracle ASM), Oracle ASM Cluster File System (Oracle ACFS), and Oracle ASM Dynamic Volume Manager (Oracle ADVM) are key components of storage management.The concepts for the key Oracle ASM components are introduced in this topic.You can add or remove disks from a disk group while a database continues to access files from the disk group. Unlike a file system driver failure, an Oracle ASM instance failure does not require restarting the operating system. Its always been a pleasure to learn new concepts from you. This tutorial uses partitions on G, H, I and J of each 196 MB.. The power setting parameter determines the speed with which rebalancing operations occur.The following topics are discussed:You define the failure groups for a disk group when you create an Oracle ASM disk group. Oracle ASM rebalancing operations are controlled by the size of the disks in a disk group.When you add a disk to a disk group, you can assign an Oracle ASM disk name or Oracle ASM assigns the Oracle ASM disk name automatically. Queries or processes related to the database cannot be performed.Striping is the most important feature of ASM. Oracle ASM chooses the disk on which to store the mirror copy in a different failure group than the primary copy. However, if the Oracle ASM instances are not part of an Oracle ASM cluster, they cannot communicate with each other. Normal redundancy disk groups require at least two failure groups. In a cluster, a disk may be assigned different operating system device names on different nodes, but the disk has the same Oracle ASM disk name on all of the nodes. Explore both standard ASM and Flex ASM applications.