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Oracle Tips by Burleson |
Disk I/O Tuning
Chapter 3:
ATA
Tuning In Windows
: Final Defragmentation Screen
The
final report from the defragmentation utility is shown in figure
2-9. Compare the initial report with the final report and you can
see significant reduction in the number of fragments, especially in
the directories and system files.
: Final Fragmentation Report
To
reduce the chance of fragmentation in Windows with Oracle, consider
using raw partitions (partitions where Oracle handles the IO to the
disk instead of the operating system). Windows uses an optimistic
write algorithm that writes blocks back to the first available
location, not their original location, causing Windows to fragment
from day one of operation.
Some
claim that since the file system in Windows (or AIX or VMS) is
designed to fragment, it performs better when fragmented. This
statement seems odd since every time you defragment in Windows (or
AIX or VMS) your performance improves. If this old SA tale where
true, wouldn't performance get worse when you defragment?
The above text is
an excerpt from:
Oracle Disk I/O Tuning
Disk IO Performance & Optimization for Oracle
Databases
ISBN
0-9745993-4-4
by Mike Ault
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