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Full Discussion: Disable async IO at OS level
Operating Systems AIX Disable async IO at OS level Post 302965438 by bakunin on Friday 29th of January 2016 05:38:30 AM
Old 01-29-2016
Quote:
Originally Posted by Maddy123
Oracle -- 11.2.0.2.0
currently filesystemio_options parameter is set to SETALL in the DB.
According to your document it is likely your DB is affected by the problem (though i am not sure, i don't understand Oracle version counting not well enough for that). Note, though, that there seems to be a fix for the Oracle software available. IMHO it would be better to apply the necessary updates (patches, fixes or what that is called in Oracle) than to disable async I/O.

In general you need asynchronous I/O to speed up disk operations which is why Oracle (and other DBs) actually demand this option to be switched on. Switching it off may solve the problem at hand but i expect it to negatively impact performance overall. (Therefore it might be better to patch Oracle than to work around the problem at OS level.)

Further, even if you decide against patching Oracle you would better switch it off in Oracle. Asynchronous I/O is a service the OS offers. You (the application) can use it but it doesn't have to do so! Your provided paper goes on to suggest to set "DISK_ASYNCH_IO = false", which is an Oracle setting, not a OS setting. Therefore:

Quote:
Originally Posted by Maddy123
One of user's DBA has suggested to either to disable async IO or apply a patch as per attached document.
Yes - I'd prefer the apply-a-patch route as stated above, but if this is - for whatever reason - not possible the DBA will simply have to switch it off themselves.

I hope this helps.

bakunin
 

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Convert::NLS_DATE_FORMAT(3pm)				User Contributed Perl Documentation			     Convert::NLS_DATE_FORMAT(3pm)

NAME
Convert::NLS_DATE_FORMAT - Convert Oracle NLS_DATE_FORMAT <-> strftime Format Strings SYNOPSIS
use Convert::NLS_DATE_FORMAT qw(oracle2posix posix2oracle); my $strptime = oracle2posix($NLS_DATE_FORMAT); $NLS_DATE_FORMAT = posix2oracle($strftime); DESCRIPTION
Convert Oracle's NLS_DATE_FORMAT string into a strptime format string, or the reverse. Functions oracle2posix Takes an Oracle NLS_DATE_FORMAT string and converts it into formatting string compatible with "strftime" or "strptime". my $format = oracle2posix('YYYY-MM-DD HH24:MI:SS'); # '%Y-%m-%d %H:%M:%S' Character sequences that should not be translated may be enclosed within double quotes, as specified in the Oracle documentation. my $format = oracle2posix('YYYY-MM-DD"T"HH24:MI:SS'); # '%Y-%m-%dT%H:%M:%S' posix2oracle Takes a "strftime" or "strptime" formatting string and converts it into an Oracle NLS_DATE_FORMAT string. It is possible to create strings which Oracle will not accept as valid NLS_DATE_FORMAT strings. my $format = posix2oracle('%Y-%m-%d %H:%M:%S'); # 'YYYY-MM-DD HH24:MI:SS' EXPORT None by default. "oracle2posix" and "posix2oracle" when asked. SEE ALSO
DateTime::Format::Oracle. AUTHOR
Nathan Gray, <kolibrie@cpan.org> COPYRIGHT AND LICENSE
Copyright (C) 2005, 2006, 2011, 2012 Nathan Gray This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.4 or, at your option, any later version of Perl 5 you may have available. perl v5.14.2 2012-01-18 Convert::NLS_DATE_FORMAT(3pm)
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