1.0 What is a Raw Partition?
2.0 When to use Raw Partitions
2.1 I/O Bound Application
2.2 Oracle Parallel Server
2.3 Asynchronous I/O (Overlapped I/O)
3.0 Advantages and drawbacks of Raw Partitions compared to File Systems
3.1 Advantages
3.2 Drawbacks
4.0 Setting Up
4.1 Calculating The Size of the Partition
4.2 Creating the partitions
4.3 Specifying in a create tablespace command
4.4 Symbolic Links
A) Creating Symbolic Links
B) Removing Symbolic Links
5.0 Backup Strategies
5.1 OCOPY80.EXE
5.2 RMAN
6.0 Raw Devices and Export/Import
7.0 How to switch files from a File System to Raw Device or from a Raw
Device to a File System.
8.0 Remarks
1.0 What is a Raw Partition?
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Raw partitions or devices are disk partitions that are not mounted and written
to as a file system, but are accessed via a character device driver. It is the
responsibility of the application to organize how the data is written to the
disk partition. So a Raw Partition is a segment of disk space pointed by the
partition table. There is no file system out there, no directories (no DIR or
NT Explorer).
Disk Naming
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At startup, Windows NT names each found disk drives following this naming
convention:
\Device\Harddisk\Partition
where: : the number of the physical drive - starts with 0
: the number of the logical number as show in the NT Disk
Adminstrator - starts with 1
\Device\Harddisk0\Partition1 would typically be the C drive
Raw Partition Definition
------------------------
There are two different types (definition methods) of Raw Partitions
a) physical disk
b) logical disk
TIP:
Although you actualy could you the physical disk approach, its
strongly recommended to use the logical disk approach.
a) Physical disk:
A physical disk or Partition0 actualy refers to the whole disk
\Device\Harddisk\Partition0
When using the Setlinks command on a Dos prompt you will notice that Windows
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Oracle 中的 Raw Partitions and Windows NT
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