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Top Forums UNIX for Advanced & Expert Users Gurus needed to diagnose severe performance degradation Post 302349784 by methyl on Tuesday 1st of September 2009 08:00:34 PM
Old 09-01-2009
achenlie is correct. If you have dropped to half-duplex it will be chronically slow. Just re-patching a cable can be enough to cause this issue when autonegotiation is in force. If you have the problem it may well be fixed by a total cold start where you bring up the network first, then the storage, then the servers.
Imho whether Jumbo Packets will cause or cure a performance issue depends on the network hardware.

To get an idea of scale, can your DBA post the contents of the following Oracle 9i system table along with how long the Oracle server had been up at the time:

Code:
v$sysstat

This table includes i/o stats and other useful pointers such as counts of performance killers like disc sorts.
 

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Session::Store::Oracle(3)				User Contributed Perl Documentation				 Session::Store::Oracle(3)

NAME
Apache::Session::Store::Oracle - Store persistent data in a Oracle database SYNOPSIS
use Apache::Session::Store::Oracle; my $store = new Apache::Session::Store::Oracle; $store->insert($ref); $store->update($ref); $store->materialize($ref); $store->remove($ref); DESCRIPTION
Apache::Session::Store::Oracle fulfills the storage interface of Apache::Session. Session data is stored in a Oracle database. SCHEMA
To use this module, you will need at least these columns in a table called 'sessions': id varchar2(32) # or however long your session IDs are. a_session long To create this schema, you can execute this command using the sqlplus program: CREATE TABLE sessions ( id varchar2(32) not null primary key, a_session long ); If you use some other command, ensure that there is a unique index on the table's id column. CONFIGURATION
The module must know what datasource, username, and password to use when connecting to the database. These values can be set using the options hash (see Apache::Session documentation). The options are DataSource, UserName, and Password. Example: tie %hash, 'Apache::Session::Oracle', $id, { DataSource => 'dbi:Oracle:database', UserName => 'database_user', Password => 'K00l' }; Instead, you may pass in an already-opened DBI handle to your database. tie %hash, 'Apache::Session::Oracle', $id, { Handle => $dbh }; The last option is LongReadLen, which specifies the maximum size of the session object. If not supplied, the default maximum size is 8 KB. AUTHOR
This modules was written by Jeffrey William Baker <jwbaker@acm.org> A fix for the commit policy was contributed by Michael Schout <mschout@gkg.net> SEE ALSO
Apache::Session, Apache::Session::Store::DBI perl v5.12.1 2007-09-28 Session::Store::Oracle(3)
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