server | mail server 6. Can you use the first partition of a disk as a bare device?
OK, but not recommended. The older version of UNIX is the bank, where the first partition of the disk often contains some information about the disk and some control information about the logical volume. If these parts are covered by a bare device, the disk becomes unrecognizable, causing the system to crash.
This is not the case with newer versions of UNIX because they employ more sophisticated techniques to manage disk, and some information about logical volumes.
However, unless you are confident that you do not use the first partition of the disk as a raw device.
7. Can I use the entire bare device as an Oracle data file?
No way. The size of the data file must be slightly smaller than the actual size of the raw device. At least two Oracle blocks should be empty.
8. Which user should the bare device belong to?
The bare device should be created by root and then assigned to an Oracle user for use. It also has to be included in the same group as the Oracle user (usually DBAs).
9. How do I specify a bare device when creating data files?
and ordinary files are not much different, the same is in single quotes inside the bare device to write the detailed path to it. As an example: to create a tablespace, using two bare devices, each 30M size, the size of the Oracle block is 4K, you can use the following command:
CREATE tablespace Raw_ts
DataFile '/dev/raw1 ' size 30712k
DataFile '/dev/raw2 ' size 30712k;
Does the size of the 10.Oracle block have anything to do with the bare device?
Oracle will have to be a multiple of the physical block size on the bare device.
11. How do I back up on a bare device?
On a bare device, you cannot use the Unix utility for backup, the only way is to use the most basic UNIX command: DD for backup. For example: DD if=/dev/raw1 of=/dev/rmt0 bs=16k. The specific syntax for DD can refer to the UNIX manual or online Help. You can also use DD to back up data files on your bare devices to disk, and then use the UNIX utility to further process them.
12. If I am not using the Oracle Parallel server option, can I have some data files on the database using the file system and the other part using bare devices?
OK. However, this can complicate the backup process.
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