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Top Forums UNIX for Advanced & Expert Users Gurus needed to diagnose severe performance degradation Post 302350019 by Neo on Wednesday 2nd of September 2009 02:14:27 PM
Old 09-02-2009
Quote:
Originally Posted by Corona688
How close can it get? I regularly get 90MB with 100baseT, but haven't seen higher than 300MB on our gigabit lines.
Well, it has been a long time since I had to do these calculations. The limits are published by IEEE (assuming point-to-point in this discussion) - I would have to Google for the numbers.

---------- Post updated at 18:14 ---------- Previous update was at 18:03 ----------

Also, I forgot to mention that the theoretical maximum for point-to-point Ethernet (assuming no other network devices talking on the channel), is different, of course, than the practical maximum based on things like "length of cable run", "crimps in the cable" , "connector losses", etc.

I once was on a site where the entire performance of the network management system was terrible and the problem was a crimped cable (I think someone rolled their chair across it in the data center, LOL)

That is why I advise to focus on the network channel(s) when you are debugging performance issues on distributed applications.
 

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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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