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<li>Data replication is common in distributed databases. Which site to query? Which site to update first and then the rest (with cascades)?</li>
<li>If a site (or a link) fails then, on re-connecting the isolated sites, the relevant data commits done during the interruption must be updated.</li>
<li>Transaction scheduling over multiple sites is much harder than the centralised case.</li>
</ul>
<p class="first-child "><a href="http://www.kaizenlog.com/operational-difficulties-with-distributed-databases/"><span title="O" class="cap"><span>O</span></span>perational Difficulties With Distributed Databases</a> is a post from: <a href="http://www.kaizenlog.com">Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)</a>
</p>
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</div><img src="http://feeds.feedburner.com/~r/Kaizenlog/~4/zCAlo6h5-j4" height="1" width="1"/>]]></content:encoded><description>&lt;p&gt;Data replication is common in distributed databases. Which site to query? Which site to update first and then the rest (with cascades)? If a site (or a link) fails then, on re-connecting the isolated sites, the relevant data commits done during the interruption must be updated. Transaction scheduling over multiple sites is much harder than [...]&lt;p&gt;&lt;a href="http://www.kaizenlog.com/operational-difficulties-with-distributed-databases/"&gt;Operational Difficulties With Distributed Databases&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt;
&lt;/p&gt;
&lt;/p&gt;&lt;p&gt;&lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog&lt;/a&gt; &lt;/p&gt;
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<li>Lack of experience or complete knowledge.</li>
<li>Complexity.</li>
<li>Costs.</li>
<li>Control.</li>
<li>Security.</li>
<li>Upgrading a database to a distributed database is not self evident.</li>
</ul>
<p class="first-child "><a href="http://www.kaizenlog.com/disadvantages-of-distributed-databases/"><span title="D" class="cap"><span>D</span></span>isadvantages of Distributed Databases</a> is a post from: <a href="http://www.kaizenlog.com">Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)</a>
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</div><img src="http://feeds.feedburner.com/~r/Kaizenlog/~4/zsAedSqsWFw" height="1" width="1"/>]]></content:encoded><description>&lt;p&gt;Lack of experience or complete knowledge. Complexity. Costs. Control. Security. Upgrading a database to a distributed database is not self evident. &lt;p class="first-child "&gt;&lt;a href="http://www.kaizenlog.com/disadvantages-of-distributed-databases/"&gt;Disadvantages of Distributed Databases&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt; &lt;/p&gt; &lt;p&gt;Related posts:&lt;/p&gt; &lt;a href='http://www.kaizenlog.com/distributed-databases-and-dbmss/' rel='bookmark' title='Distributed Databases and DBMSs'&gt;Distributed Databases [...]&lt;p&gt;&lt;a href="http://www.kaizenlog.com/disadvantages-of-distributed-databases/"&gt;Disadvantages of Distributed Databases&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt;
&lt;/p&gt;
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&lt;/ol&gt;</description><wfw:commentRss xmlns:wfw="http://wellformedweb.org/CommentAPI/">http://www.kaizenlog.com/disadvantages-of-distributed-databases/feed/</wfw:commentRss><slash:comments xmlns:slash="http://purl.org/rss/1.0/modules/slash/">0</slash:comments><feedburner:origLink>http://www.kaizenlog.com/disadvantages-of-distributed-databases/#utm_source=feed&amp;utm_medium=feed&amp;utm_campaign=feed?utm_source=rss&amp;utm_medium=rss&amp;utm_campaign=disadvantages-of-distributed-databases</feedburner:origLink></item><item><title>Advantages of Distributed Databases</title><link>http://feedproxy.google.com/~r/Kaizenlog/~3/h8CqfnEM6wU/</link><category>Databases</category><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">kaizenlog@gmail.com (Kaizenlog)</dc:creator><pubDate>Sun, 13 May 2012 12:46:06 PDT</pubDate><guid isPermaLink="false">http://www.kaizenlog.com/?p=2352</guid><content:encoded xmlns:content="http://purl.org/rss/1.0/modules/content/"><![CDATA[<ul>
<li>Performance.</li>
<li>Reliability.</li>
<li>Upsizing.</li>
<li>Shareability.</li>
<li>Local autonomy.</li>
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<p class="first-child "><a href="http://www.kaizenlog.com/advantages-of-distributed-databases/"><span title="A" class="cap"><span>A</span></span>dvantages of Distributed Databases</a> is a post from: <a href="http://www.kaizenlog.com">Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)</a>
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</div><img src="http://feeds.feedburner.com/~r/Kaizenlog/~4/h8CqfnEM6wU" height="1" width="1"/>]]></content:encoded><description>&lt;p&gt;Performance. Reliability. Upsizing. Shareability. Local autonomy. &lt;p class="first-child "&gt;&lt;a href="http://www.kaizenlog.com/advantages-of-distributed-databases/"&gt;Advantages of Distributed Databases&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt; &lt;/p&gt; &lt;p&gt;Related posts:&lt;/p&gt; &lt;a href='http://www.kaizenlog.com/distributed-databases-and-dbmss/' rel='bookmark' title='Distributed Databases and DBMSs'&gt;Distributed Databases and DBMSs&lt;/a&gt; &lt;a href='http://www.kaizenlog.com/problems/' rel='bookmark' title='Problems'&gt;Problems&lt;/a&gt; &lt;a href='http://www.kaizenlog.com/what-is-a-distributed-database-system/' rel='bookmark' title='What is a Distributed Database System?'&gt;What [...]&lt;p&gt;&lt;a href="http://www.kaizenlog.com/advantages-of-distributed-databases/"&gt;Advantages of Distributed Databases&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt;
&lt;/p&gt;
&lt;/p&gt;&lt;p&gt;&lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog&lt;/a&gt; &lt;/p&gt;
Related posts:&lt;ol&gt;
&lt;li&gt;&lt;a href='http://www.kaizenlog.com/distributed-databases-and-dbmss/' rel='bookmark' title='Distributed Databases and DBMSs'&gt;Distributed Databases and DBMSs&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href='http://www.kaizenlog.com/problems/' rel='bookmark' title='Problems'&gt;Problems&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href='http://www.kaizenlog.com/what-is-a-distributed-database-system/' rel='bookmark' title='What is a Distributed Database System?'&gt;What is a Distributed Database System?&lt;/a&gt;&lt;/li&gt;
&lt;/ol&gt;</description><wfw:commentRss xmlns:wfw="http://wellformedweb.org/CommentAPI/">http://www.kaizenlog.com/advantages-of-distributed-databases/feed/</wfw:commentRss><slash:comments xmlns:slash="http://purl.org/rss/1.0/modules/slash/">0</slash:comments><feedburner:origLink>http://www.kaizenlog.com/advantages-of-distributed-databases/#utm_source=feed&amp;utm_medium=feed&amp;utm_campaign=feed?utm_source=rss&amp;utm_medium=rss&amp;utm_campaign=advantages-of-distributed-databases</feedburner:origLink></item><item><title>Distributed Databases and DBMSs</title><link>http://feedproxy.google.com/~r/Kaizenlog/~3/9DWon9_hDaM/</link><category>Kaizenlog</category><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">kaizenlog@gmail.com (Kaizenlog)</dc:creator><pubDate>Sun, 13 May 2012 12:44:26 PDT</pubDate><guid isPermaLink="false">http://www.kaizenlog.com/?p=2351</guid><content:encoded xmlns:content="http://purl.org/rss/1.0/modules/content/"><![CDATA[<ul>
<li>A distributed database is a collection of a number of logically related databases partitioned over a computer communications network, but whose data is available to all of its end users, irrespective of their physical location.</li>
<li>A distributed DBMS maintains distributed databases and attempts to achieve a high level of distribution transparancy.</li>
</ul>
<p class="first-child "><a href="http://www.kaizenlog.com/distributed-databases-and-dbmss/"><span title="D" class="cap"><span>D</span></span>istributed Databases and DBMSs</a> is a post from: <a href="http://www.kaizenlog.com">Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)</a>
</p>
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<li><a href='http://www.kaizenlog.com/distributed-and-multidatabase-solutions-introduction/' rel='bookmark' title='Distributed and Multidatabase Solutions Introduction'>Distributed and Multidatabase Solutions Introduction</a></li>
</ol><p><a href="http://www.kaizenlog.com">Kaizenlog</a> </p>
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</div><img src="http://feeds.feedburner.com/~r/Kaizenlog/~4/9DWon9_hDaM" height="1" width="1"/>]]></content:encoded><description>&lt;p&gt;A distributed database is a collection of a number of logically related databases partitioned over a computer communications network, but whose data is available to all of its end users, irrespective of their physical location. A distributed DBMS maintains distributed databases and attempts to achieve a high level of distribution transparancy. &lt;p class="first-child "&gt;&lt;a href="http://www.kaizenlog.com/distributed-databases-and-dbmss/"&gt;Distributed [...]&lt;p&gt;&lt;a href="http://www.kaizenlog.com/distributed-databases-and-dbmss/"&gt;Distributed Databases and DBMSs&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt;
&lt;/p&gt;
&lt;/p&gt;&lt;p&gt;&lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog&lt;/a&gt; &lt;/p&gt;
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&lt;/ol&gt;</description><wfw:commentRss xmlns:wfw="http://wellformedweb.org/CommentAPI/">http://www.kaizenlog.com/distributed-databases-and-dbmss/feed/</wfw:commentRss><slash:comments xmlns:slash="http://purl.org/rss/1.0/modules/slash/">0</slash:comments><feedburner:origLink>http://www.kaizenlog.com/distributed-databases-and-dbmss/#utm_source=feed&amp;utm_medium=feed&amp;utm_campaign=feed?utm_source=rss&amp;utm_medium=rss&amp;utm_campaign=distributed-databases-and-dbmss</feedburner:origLink></item><item><title>Databases and Networking</title><link>http://feedproxy.google.com/~r/Kaizenlog/~3/CBBq1U3JzVI/</link><category>Databases</category><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">kaizenlog@gmail.com (Kaizenlog)</dc:creator><pubDate>Sun, 13 May 2012 12:05:30 PDT</pubDate><guid isPermaLink="false">http://www.kaizenlog.com/?p=2350</guid><content:encoded xmlns:content="http://purl.org/rss/1.0/modules/content/"><![CDATA[<p class="first-child "><span title="S" class="cap"><span>S</span></span>trange combination.</p>
<ul>
<li>Databases are a logical repository of structured data. With most implementations having a centralised framework.</li>
<li>High level networks promote sharing.</li>
</ul>
<p><a href="http://www.kaizenlog.com/databases-and-networking/">Databases and Networking</a> is a post from: <a href="http://www.kaizenlog.com">Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)</a>
</p>
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<li><a href='http://www.kaizenlog.com/decision-trees-and-computer-simulation/' rel='bookmark' title='Decision Trees and Computer Simulation'>Decision Trees and Computer Simulation</a></li>
</ol><p><a href="http://www.kaizenlog.com">Kaizenlog</a> </p>
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</div><img src="http://feeds.feedburner.com/~r/Kaizenlog/~4/CBBq1U3JzVI" height="1" width="1"/>]]></content:encoded><description>&lt;p&gt;&lt;p class="first-child "&gt;Strange combination.&lt;/p&gt; Databases are a logical repository of structured data. With most implementations having a centralised framework. High level networks promote sharing. &lt;p&gt;&lt;a href="http://www.kaizenlog.com/databases-and-networking/"&gt;Databases and Networking&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt; &lt;/p&gt; &lt;p&gt;Related posts:&lt;/p&gt; &lt;a href='http://www.kaizenlog.com/introduction-to-databases/' rel='bookmark' title='Introduction to Databases'&gt;Introduction to Databases&lt;/a&gt; [...]&lt;p&gt;&lt;a href="http://www.kaizenlog.com/databases-and-networking/"&gt;Databases and Networking&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt;
&lt;/p&gt;
&lt;/p&gt;&lt;p&gt;&lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog&lt;/a&gt; &lt;/p&gt;
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&lt;li&gt;&lt;a href='http://www.kaizenlog.com/database-schemas/' rel='bookmark' title='Database Schemas'&gt;Database Schemas&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href='http://www.kaizenlog.com/decision-trees-and-computer-simulation/' rel='bookmark' title='Decision Trees and Computer Simulation'&gt;Decision Trees and Computer Simulation&lt;/a&gt;&lt;/li&gt;
&lt;/ol&gt;</description><wfw:commentRss xmlns:wfw="http://wellformedweb.org/CommentAPI/">http://www.kaizenlog.com/databases-and-networking/feed/</wfw:commentRss><slash:comments xmlns:slash="http://purl.org/rss/1.0/modules/slash/">0</slash:comments><feedburner:origLink>http://www.kaizenlog.com/databases-and-networking/#utm_source=feed&amp;utm_medium=feed&amp;utm_campaign=feed?utm_source=rss&amp;utm_medium=rss&amp;utm_campaign=databases-and-networking</feedburner:origLink></item><item><title>Distributed and Multidatabase Solutions Introduction</title><link>http://feedproxy.google.com/~r/Kaizenlog/~3/shL0Q1XbftE/</link><category>Databases</category><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">kaizenlog@gmail.com (Kaizenlog)</dc:creator><pubDate>Sun, 13 May 2012 12:01:05 PDT</pubDate><guid isPermaLink="false">http://www.kaizenlog.com/?p=2349</guid><content:encoded xmlns:content="http://purl.org/rss/1.0/modules/content/"><![CDATA[<p class="first-child "><span title="C" class="cap"><span>C</span></span>ould a database be made available to a number of users without specifying a &quot;single&quot; computer? &#8211; Yes.</p>
<p>&nbsp;</p>
<p>How?</p>
<ul>
<li>Distributing the data.</li>
<li>Distributing the DBMS processing.</li>
<li>Distributing the database control etc.</li>
</ul>
<p>
	What do we need?</p>
<ul>
<li>More refined database techniques.</li>
<li>Better and new DBMS technology.</li>
<li>A networking infrastructure that connects all of the databases&#39; end users.</li>
</ul>
<p><a href="http://www.kaizenlog.com/distributed-and-multidatabase-solutions-introduction/">Distributed and Multidatabase Solutions Introduction</a> is a post from: <a href="http://www.kaizenlog.com">Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)</a>
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</ol><p><a href="http://www.kaizenlog.com">Kaizenlog</a> </p>
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</div><img src="http://feeds.feedburner.com/~r/Kaizenlog/~4/shL0Q1XbftE" height="1" width="1"/>]]></content:encoded><description>&lt;p&gt;&lt;p class="first-child "&gt;Could a database be made available to a number of users without specifying a &amp;#34;single&amp;#34; computer? &amp;#8211; Yes.&lt;/p&gt; &lt;p&gt;&amp;#160;&lt;/p&gt; &lt;p&gt;How?&lt;/p&gt; Distributing the data. Distributing the DBMS processing. Distributing the database control etc. &lt;p&gt; What do we need?&lt;/p&gt; More refined database techniques. Better and new DBMS technology. A networking infrastructure that connects all of [...]&lt;p&gt;&lt;a href="http://www.kaizenlog.com/distributed-and-multidatabase-solutions-introduction/"&gt;Distributed and Multidatabase Solutions Introduction&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt;
&lt;/p&gt;
&lt;/p&gt;&lt;p&gt;&lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog&lt;/a&gt; &lt;/p&gt;
Related posts:&lt;ol&gt;
&lt;li&gt;&lt;a href='http://www.kaizenlog.com/introduction-to-databases/' rel='bookmark' title='Introduction to Databases'&gt;Introduction to Databases&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href='http://www.kaizenlog.com/reliability-through-distributed-transactions/' rel='bookmark' title='Reliability Through Distributed Transactions'&gt;Reliability Through Distributed Transactions&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href='http://www.kaizenlog.com/database-management-system-dbms/' rel='bookmark' title='Database Management System (DBMS)'&gt;Database Management System (DBMS)&lt;/a&gt;&lt;/li&gt;
&lt;/ol&gt;</description><wfw:commentRss xmlns:wfw="http://wellformedweb.org/CommentAPI/">http://www.kaizenlog.com/distributed-and-multidatabase-solutions-introduction/feed/</wfw:commentRss><slash:comments xmlns:slash="http://purl.org/rss/1.0/modules/slash/">0</slash:comments><feedburner:origLink>http://www.kaizenlog.com/distributed-and-multidatabase-solutions-introduction/#utm_source=feed&amp;utm_medium=feed&amp;utm_campaign=feed?utm_source=rss&amp;utm_medium=rss&amp;utm_campaign=distributed-and-multidatabase-solutions-introduction</feedburner:origLink></item><item><title>Allocation Problem</title><link>http://feedproxy.google.com/~r/Kaizenlog/~3/CJOHLDypOU0/</link><category>Databases</category><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">kaizenlog@gmail.com (Kaizenlog)</dc:creator><pubDate>Sun, 13 May 2012 11:50:00 PDT</pubDate><guid isPermaLink="false">http://www.kaizenlog.com/?p=2348</guid><content:encoded xmlns:content="http://purl.org/rss/1.0/modules/content/"><![CDATA[<p class="first-child "><span title="I" class="cap"><span>I</span></span>f there are two fragments F and S, allocation problem involves finding optimal distribution of F to S.</p>
<p>Optimality can be defined;</p>
<ul>
<li>Minimal cost.</li>
<li>Performance.</li>
</ul>
<p><a href="http://www.kaizenlog.com/allocation-problem/">Allocation Problem</a> is a post from: <a href="http://www.kaizenlog.com">Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)</a>
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</div><img src="http://feeds.feedburner.com/~r/Kaizenlog/~4/CJOHLDypOU0" height="1" width="1"/>]]></content:encoded><description>&lt;p&gt;&lt;p class="first-child "&gt;If there are two fragments F and S, allocation problem involves finding optimal distribution of F to S.&lt;/p&gt; &lt;p&gt;Optimality can be defined;&lt;/p&gt; Minimal cost. Performance. &lt;p&gt;&lt;a href="http://www.kaizenlog.com/allocation-problem/"&gt;Allocation Problem&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt; &lt;/p&gt; &lt;p&gt;Related posts:&lt;/p&gt; &lt;a href='http://www.kaizenlog.com/activity-based-costing/' rel='bookmark' title='Activity-Based Costing'&gt;Activity-Based Costing&lt;/a&gt; [...]&lt;p&gt;&lt;a href="http://www.kaizenlog.com/allocation-problem/"&gt;Allocation Problem&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt;
&lt;/p&gt;
&lt;/p&gt;&lt;p&gt;&lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog&lt;/a&gt; &lt;/p&gt;
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&lt;/ol&gt;</description><wfw:commentRss xmlns:wfw="http://wellformedweb.org/CommentAPI/">http://www.kaizenlog.com/allocation-problem/feed/</wfw:commentRss><slash:comments xmlns:slash="http://purl.org/rss/1.0/modules/slash/">0</slash:comments><feedburner:origLink>http://www.kaizenlog.com/allocation-problem/#utm_source=feed&amp;utm_medium=feed&amp;utm_campaign=feed?utm_source=rss&amp;utm_medium=rss&amp;utm_campaign=allocation-problem</feedburner:origLink></item><item><title>Information Requirements of Vertical Partitioning</title><link>http://feedproxy.google.com/~r/Kaizenlog/~3/Jveg8lD-l3c/</link><category>Databases</category><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">kaizenlog@gmail.com (Kaizenlog)</dc:creator><pubDate>Sun, 13 May 2012 11:23:49 PDT</pubDate><guid isPermaLink="false">http://www.kaizenlog.com/?p=2346</guid><content:encoded xmlns:content="http://purl.org/rss/1.0/modules/content/"><![CDATA[<p class="first-child "><span title="M" class="cap"><span>M</span></span>ajor information requirement is related to applications. The major requirement for applications is access frequencies.</p>
<p>Algorithms to calculate vertical partitioning include:</p>
<ul>
<li>Clustering algorithm.</li>
<li>Partitioning algorithm.</li>
</ul>
<p><a href="http://www.kaizenlog.com/information-requirements-of-vertical-partitioning/">Information Requirements of Vertical Partitioning</a> is a post from: <a href="http://www.kaizenlog.com">Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)</a>
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</div><img src="http://feeds.feedburner.com/~r/Kaizenlog/~4/Jveg8lD-l3c" height="1" width="1"/>]]></content:encoded><description>&lt;p&gt;&lt;p class="first-child "&gt;Major information requirement is related to applications. The major requirement for applications is access frequencies.&lt;/p&gt; &lt;p&gt;Algorithms to calculate vertical partitioning include:&lt;/p&gt; Clustering algorithm. Partitioning algorithm. &lt;p&gt;&lt;a href="http://www.kaizenlog.com/information-requirements-of-vertical-partitioning/"&gt;Information Requirements of Vertical Partitioning&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt; &lt;/p&gt; &lt;p&gt;Related posts:&lt;/p&gt; &lt;a href='http://www.kaizenlog.com/information-requirements/' rel='bookmark' [...]&lt;p&gt;&lt;a href="http://www.kaizenlog.com/information-requirements-of-vertical-partitioning/"&gt;Information Requirements of Vertical Partitioning&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt;
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&lt;/ol&gt;</description><wfw:commentRss xmlns:wfw="http://wellformedweb.org/CommentAPI/">http://www.kaizenlog.com/information-requirements-of-vertical-partitioning/feed/</wfw:commentRss><slash:comments xmlns:slash="http://purl.org/rss/1.0/modules/slash/">0</slash:comments><feedburner:origLink>http://www.kaizenlog.com/information-requirements-of-vertical-partitioning/#utm_source=feed&amp;utm_medium=feed&amp;utm_campaign=feed?utm_source=rss&amp;utm_medium=rss&amp;utm_campaign=information-requirements-of-vertical-partitioning</feedburner:origLink></item><item><title>Vertical Partitioning</title><link>http://feedproxy.google.com/~r/Kaizenlog/~3/-KwrYg49qGU/</link><category>Databases</category><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">kaizenlog@gmail.com (Kaizenlog)</dc:creator><pubDate>Sun, 13 May 2012 11:13:35 PDT</pubDate><guid isPermaLink="false">http://www.kaizenlog.com/?p=2345</guid><content:encoded xmlns:content="http://purl.org/rss/1.0/modules/content/"><![CDATA[<p class="first-child "><span title="T" class="cap"><span>T</span></span>o obtain optimal solutions in vertical fragmentation, heuristics is used.</p>
<p>Two types of heuristics approach exists:</p>
<ul>
<li>Grouping: assigns each attribute to one fragment, and at each step joins some of the fragments until some criteria is satisfied.</li>
<li>Splitting: starts with a relation and decides on beneficial partitionings based on the access behaviour applications to the attributes.</li>
</ul>
<p>Splitting fits more naturally in the top-down methodology and the optimal solution is more likely found in a full relation.</p>
<p><a href="http://www.kaizenlog.com/vertical-partitioning/">Vertical Partitioning</a> is a post from: <a href="http://www.kaizenlog.com">Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)</a>
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</div><img src="http://feeds.feedburner.com/~r/Kaizenlog/~4/-KwrYg49qGU" height="1" width="1"/>]]></content:encoded><description>&lt;p&gt;&lt;p class="first-child "&gt;To obtain optimal solutions in vertical fragmentation, heuristics is used.&lt;/p&gt; &lt;p&gt;Two types of heuristics approach exists:&lt;/p&gt; Grouping: assigns each attribute to one fragment, and at each step joins some of the fragments until some criteria is satisfied. Splitting: starts with a relation and decides on beneficial partitionings based on the access behaviour applications [...]&lt;p&gt;&lt;a href="http://www.kaizenlog.com/vertical-partitioning/"&gt;Vertical Partitioning&lt;/a&gt; is a post from: &lt;a href="http://www.kaizenlog.com"&gt;Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)&lt;/a&gt;
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&lt;/ol&gt;</description><wfw:commentRss xmlns:wfw="http://wellformedweb.org/CommentAPI/">http://www.kaizenlog.com/vertical-partitioning/feed/</wfw:commentRss><slash:comments xmlns:slash="http://purl.org/rss/1.0/modules/slash/">0</slash:comments><feedburner:origLink>http://www.kaizenlog.com/vertical-partitioning/#utm_source=feed&amp;utm_medium=feed&amp;utm_campaign=feed?utm_source=rss&amp;utm_medium=rss&amp;utm_campaign=vertical-partitioning</feedburner:origLink></item><item><title>Horizontal Fragmentation</title><link>http://feedproxy.google.com/~r/Kaizenlog/~3/oAxSYBWCkbc/</link><category>Databases</category><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">kaizenlog@gmail.com (Kaizenlog)</dc:creator><pubDate>Sun, 13 May 2012 11:04:15 PDT</pubDate><guid isPermaLink="false">http://www.kaizenlog.com/?p=2344</guid><content:encoded xmlns:content="http://purl.org/rss/1.0/modules/content/"><![CDATA[<p class="first-child "><span title="H" class="cap"><span>H</span></span>orizontal fragmentation partitions a relation along its tuples. There are two versions of horizontal partitioning:</p>
<ul>
<li>Primary horizontal fragmentation.</li>
<li>Derived horizontal fragmentation.</li>
</ul>
<p>&nbsp;</p>
<p>Primary horizontal fragmentation: is defined by a selection operation on the owner relations of a database schema.</p>
<p>Derived horizontal fragmentation: is defined on a member relation of a link according to a selection operation specified by its owner.</p>
<p><a href="http://www.kaizenlog.com/horizontal-fragmentation/">Horizontal Fragmentation</a> is a post from: <a href="http://www.kaizenlog.com">Kaizenlog - A blog from the Maltese Islands (Malta, Gozo, Comino)</a>
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