For optimal disk performance, Oracle should always use direct I/O
to its data files, bypassing any caching at the OS layer. Direct
I/O must be enabled both in Oracle via the filesystemio_options
parameter and
direct
IO must be configured within your operating system.
Oracle controls direct I/O with a parameter named
filesystemio_options. According to the Oracle documentation the
filesystemio_options parameter must be set to SETALL, which
is the preferred method according to the Oracle documentation, or
DIRECTIO in order for Oracle to read data blocks directly from disk.
Also, you must set filesystemio_options = true to use
Oracle external tables.
|
|
 |
|
Guarantee your Success!
Oracle is the
world's most complex, robust and flexible database, considered
impossible to master without a mentor.
That's why all BC
Oracle trainers are working professionals, experts in Oracle who
share their tips and secrets. |
|
| |
|
Burleson is the American Team
Note:
This Oracle
documentation was created as a support and Oracle training reference for use by our
DBA performance tuning consulting professionals.
Feel free to ask questions on our
Oracle forum.
Verify
experience!
Anyone
considering using the services of an Oracle support expert should
independently investigate their credentials and experience, and not rely on
advertisements and self-proclaimed expertise. All legitimate Oracle experts
publish
their Oracle
qualifications.
Errata?
Oracle technology is changing and we
strive to update our BC Oracle support information. If you find an error
or have a suggestion for improving our content, we would appreciate your
feedback. Just
e-mail:
 and include the URL for the page.
Copyright ? 1996 - 2012
All rights reserved.
Oracle ?
is the registered trademark of Oracle Corporation.
|
|
