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Operating Systems Solaris Where is my memory? How to fix it ? Post 303037773 by gull04 on Tuesday 13th of August 2019 08:29:52 AM
Hi,

I'm not really a great fan of trying things out on production servers, it always seems to come back and bite you from an other direction. If your environment is anything like most of the ones I have worked in over the years, test and development machines seem to be scarce and if they exist - getting testing resource is like finding a winning lottery ticket.

It's a difficult call for me, I don't know anything about your environment other than you are using Solaris 11.2, one server has 36Gb of memory, the other has 16Gb of memory and they could be whole root zones. And of course the fact that both servers are reporting almost 90% memory utilisation which will trigger an alert.

Much of this is going to come down to a few things here;
  1. Can you do this on a Test/Dev sever?
  2. Does going ove 90% memory utilisation cause a problem with the application.
  3. Can you live with the alert generated at the 90% threshold, can it be ignored or the threshold changed.
  4. Do you have to try this change in a production environment, if there are problems whats the regression?
  5. How critical is the production server, if it's critical could you test on the DR server?
  6. Will your boss back you up if you take the iteritive approach and set "user_reserve_hint_pct" to 60% as Oracle suggest.

I know the above isn't overly helpful, but asking someone with no experience of the environment in which you work just opens up many more questions than can't be easilly answered in a forum such as this.

My preferred approach to this would be to run an explorer over the system and raise a support ticket (case) with Oracle support, in the ticket you should cite your concerns - please be aware that Oracle may well come back and suggest things like the patching is brought up to date for the systems.

Regards

Gull04

Last edited by gull04; 08-13-2019 at 09:37 AM.. Reason: Can't Spell
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DBIx::Class::Storage::DBI::Oracle::WhereJoins(3)	User Contributed Perl Documentation	  DBIx::Class::Storage::DBI::Oracle::WhereJoins(3)

NAME
DBIx::Class::Storage::DBI::Oracle::WhereJoins - Oracle joins in WHERE syntax support (instead of ANSI). PURPOSE
This module is used with Oracle < 9.0 due to lack of support for standard ANSI join syntax. SYNOPSIS
DBIx::Class should automagically detect Oracle and use this module with no work from you. DESCRIPTION
This class implements Oracle's WhereJoin support. Instead of: SELECT x FROM y JOIN z ON y.id = z.id It will write: SELECT x FROM y, z WHERE y.id = z.id It should properly support left joins, and right joins. Full outer joins are not possible due to the fact that Oracle requires the entire query be written to union the results of a left and right join, and by the time this module is called to create the where query and table definition part of the SQL query, it's already too late. METHODS
See DBIx::Class::SQLMaker::OracleJoins for implementation details. BUGS
Does not support full outer joins. Probably lots more. SEE ALSO
DBIx::Class::SQLMaker DBIx::Class::SQLMaker::OracleJoins DBIx::Class::Storage::DBI::Oracle::Generic DBIx::Class AUTHOR
Justin Wheeler "<jwheeler@datademons.com>" CONTRIBUTORS
David Jack Olrik "<djo@cpan.org>" LICENSE
This module is licensed under the same terms as Perl itself. perl v5.18.2 2013-07-12 DBIx::Class::Storage::DBI::Oracle::WhereJoins(3)

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