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Direct and Asynchronous I/O - Take advantage of the performance advantages associated with Direct and Asynchronous I/O.



Christoph said...

With version 10.1 you need to relink on LINUX your executables.
See
http://www.nextre.it/oracledocs/asincio.html

Roger said...

Hi Tim,

Unfortunately the options are not quite correct.

ASYNCH - Enabled synchronous I/O where possible.
DIRECTIO- Enabled direct I/O where possible.
SETALL- Enabled both direct I/O and synchronous I/O where possible.
ASYNCH - Disabled both direct I/O and synchronous I/O.

Synchronous should be replaced with asynchronous and ASYNCH is listed twice the last option should read NONE.

It should read something like this.

ASYNCH - Enabled asynchronous I/O where possible.
DIRECTIO- Enabled direct I/O where possible.
SETALL- Enabled both direct I/O and asynchronous I/O where possible.
NONE - Disabled both direct I/O and asynchronous
I/O.

Cheers,

Roger.

Tim... said...

Hi.

Whoops. Bad cut and paste. :(

Thanks for the heads-up. I've corrected the mistake. :)

Cheers

Tim...

Roger said...

Hi Tim,

You are having a bad day ;-)

It still reads synchronous rather than asynchronous in the option descriptions.

Cheers,

Roger.

Tim... said...

Hi.

I've just corrected it. Thanks for being so patient. I'm at OpenWorld and the jet lag is killing me. :)

Cheers

Tim...

Cliff said...

The text still appears to be incorrect.

It should be as Roger points out

ASYNCH - Enabled asynchronous I/O where possible.
DIRECTIO- Enabled direct I/O where possible.
SETALL- Enabled both direct I/O and asynchronous I/O where possible.
NONE - Disabled both direct I/O and asynchronous


Tim... said...

Hi.

3rd time lucky... I hope.

I think I've got them all now. :)

Cheers

Tim...

Wayne T Smith said...

Setting DIRECTIO is not without risk. I have one older 64-bit, non-LVM, Linux system where this caused the DB to not start. One of the control files was corrupted. References: 132565.1, 360287.1 and the DB Admin Guide. cheers, wayne

Smithc351 said...

Very neat article post.Much thanks again. Much obliged.

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