ASM - Introduction
ASM - Automatic storage management is Introduced in Oracle 10gr1.
ASM provides many of the same benefits as storage technologies such as RAID or logical volume managers (LVMs). Like these technologies, ASM enables you to create a single disk group from a collection of individual disk devices. It balances I/O to the disk group across all of the devices in the disk group. It also implements striping and mirroring to improve I/O performance and data reliability.
However, unlike RAID or LVMs, ASM implements striping and mirroring at the file level. This implementation enables you to specify different storage attributes for individual files in the same disk group.
Benefits of Automatic Storage Management
-Automatic Storage Management provides easier administration.
-There is no need to specify and manage filenames. Wherever a file is created, a disk group can be specified instead. Every new file automatically gets a new unique name. This prevents using the same filename in two different databases. Disk group naming avoids using two different names for the same file.
-For many situations, Automatic Storage Management provides the functions provided by external volume managers and file systems.
-Automatic Storage Management includes storage reliability features, such as mirroring. The storage reliability policy is applied on a file basis, rather than on a volume basis. Hence, the same disk group can contain a combination of files protected by mirroring, parity, or not protected at all.
-Automatic Storage Management improves performance.
-Automatic Storage Management maximizes performance by automatically distributing database files across all disks in a disk group. It has the performance of raw disk I/O without the inconvenience of managing raw disks.
-Unlike logical volume managers, Automatic Storage Management maintenance operations do not require that the database be shut down. This allows adding or dropping disks while the disks are in use.
-Automatic Storage Management eliminates the need for manual disk tuning. To help manage performance, file creation attributes are controlled by disk group-specific templates.
ASM - Automatic storage management is Introduced in Oracle 10gr1.
ASM provides many of the same benefits as storage technologies such as RAID or logical volume managers (LVMs). Like these technologies, ASM enables you to create a single disk group from a collection of individual disk devices. It balances I/O to the disk group across all of the devices in the disk group. It also implements striping and mirroring to improve I/O performance and data reliability.
However, unlike RAID or LVMs, ASM implements striping and mirroring at the file level. This implementation enables you to specify different storage attributes for individual files in the same disk group.
Benefits of Automatic Storage Management
-Automatic Storage Management provides easier administration.
-There is no need to specify and manage filenames. Wherever a file is created, a disk group can be specified instead. Every new file automatically gets a new unique name. This prevents using the same filename in two different databases. Disk group naming avoids using two different names for the same file.
-For many situations, Automatic Storage Management provides the functions provided by external volume managers and file systems.
-Automatic Storage Management includes storage reliability features, such as mirroring. The storage reliability policy is applied on a file basis, rather than on a volume basis. Hence, the same disk group can contain a combination of files protected by mirroring, parity, or not protected at all.
-Automatic Storage Management improves performance.
-Automatic Storage Management maximizes performance by automatically distributing database files across all disks in a disk group. It has the performance of raw disk I/O without the inconvenience of managing raw disks.
-Unlike logical volume managers, Automatic Storage Management maintenance operations do not require that the database be shut down. This allows adding or dropping disks while the disks are in use.
-Automatic Storage Management eliminates the need for manual disk tuning. To help manage performance, file creation attributes are controlled by disk group-specific templates.
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