1. disk groups
2. disks
3. failure groups
4. files
5. templates
Disk Groups
=============
The primary component of ASM is the disk group. A disk group consists
of a grouping of disks that are managed together as a unit. You
configure ASM by creating disk groups to store database files. Oracle
provides SQL statements that create and manage disk groups, their
contents, and their metadata.
Disks
==============
The disks in a disk group are referred to as ASM disks. On Windows
operating systems, an ASM disk is always a partition. On all other
platforms, an ASM disk can be:
- A partition of a logical unit number (LUN)
- A network-attached file
Failure Groups & its benefits
==============================
Failure groups define ASM disks that share a common potential failure
mechanism. An example of a failure group is a set of SCSI disks
sharing the same SCSI controller. Failure groups are used to determine
which ASM disks to use for storing redundant copies of data. For
example, if two-way mirroring is specified for a file, ASM
automatically stores redundant copies of file extents in separate
failure groups. Failure groups apply only to normal and high
redundancy disk groups. You define the failure groups in a disk group
when you create or alter the disk group.
Files
=================
Files written on ASM disks are ASM files, whose names are
automatically generated by ASM. You can specify user-friendly alias
names (or just aliases) for ASM files, and you can create a
hierarchical directory structure for these aliases. Each ASM file is
completely contained within a single disk group, and is evenly spaced
over all of the ASM disks in the disk group.
Templates
==================
Templates are collections of file attribute values, and are used to
set mirroring and striping attributes of each type of database file
(datafile, control file, redo log file, and so on) created in ASM disk
groups. Each disk group has a default template associated with each
file type.
You can also create your own templates to meet unique requirements.
You can then include a template name when creating a file, thereby
assigning desired attributes on an individual file basis rather than
on the basis of file type.
Best regards,
M. Ramli
--- In [email protected], Syauqi <[EMAIL PROTECTED]> wrote:
>
> Thanks,
>
> di ASM (Automatic Storage Management) ada istilah FAILURE GROUP.
> Apa yang dimaksud dengan istilah ini, dan apa manfaat penggunaannya?
>
> Thanks-Syauqi
>
>
> On 4/27/06, Tomi Wijanto <[EMAIL PROTECTED]> wrote:
> >
> > Heap-organized table adalah tabel yg paling umum kita
> > pakai. Secara default tipe tabel adalah Heap.
> >
> > Index-org table (IOT) adalah tabel yang memiliki
> > struktur sebagai index. Artinya apabila ada data baru
> > di-insert, maka data tsb akan diletakkan pada
> > urutan-nya sesuai dengan primary key.
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
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