59 lines
3.7 KiB
HTML
59 lines
3.7 KiB
HTML
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="dc.language" scheme="rfc1766" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<meta name="dc.date" scheme="iso8601" content="2005-10-17" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<title>Application structure</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="struct"></a>
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<h3 id="struct">Application structure</h3>
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<p>An OptiConnect cluster will usually have a database system and one or more
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application systems. The system where the database resides is the <span class="bold">database </span> system, and the systems that contain the applications are called <span class="bold">application</span> systems. The OptiConnect software allows a
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program on the application system to make database changes or database queries
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on the database system. Central Processing Unit (CPU) work load ratios of
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under 30% database and 70% application will benefit the most by distributing
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work loads between systems in the OptiConnect network. <a href="rzau3struct.htm#app">Figure 6</a> illustrates
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an example of this type of setup.</p>
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<a name="app"></a>
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<div class="fignone" id="app"><span class="figcap">Figure 6. CPU Utilization by OptiConnect</span>
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<div class="mmobj">
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<img src="rv4f201.gif" alt="CPU Utilization by OptiConnect" /></div></div>
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<p>Another important consideration is whether the application is batch or
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interactive. This clustering technology is optimal for interactive workloads.
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Batch workloads require special considerations and may not be appropriate
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for use in an OptiConnect environment. However, solutions can be designed
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to effectively handle a mixture of batch and interactive workloads, as well
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as multiple database and application methods. Applications with heavy database
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activity and large numbers of file open and close operations may not realize
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the full potential of the OptiConnect technology.</p>
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<p>When a program opens a database file, the associated DDM file or RDB entry
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identifies the database system name. The OptiConnect Connection Manager on
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the application system sends the database request to the database system by
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using a fast <span class="italic">device driver</span>. The OptiConnect communication
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link provides access at a fraction of the DDM system overhead because its
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communications protocol operates only in a specific shared bus environment.
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The OptiConnect Connection Manager connects the request with an agent job
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on the database system. Agent jobs work with the database code to issue the
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request and route the result back to the application system.</p>
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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