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	<title>The Pythian Blog &#187; Grégory Guillou</title>
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	<description>News and views from Pythian DBAs</description>
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		<title>Oracle: Delete and Re-Insert a Row in the Same Statement</title>
		<link>http://www.pythian.com/news/2057/oracle-delete-and-re-insert-row-in-the-same-statement/</link>
		<comments>http://www.pythian.com/news/2057/oracle-delete-and-re-insert-row-in-the-same-statement/#comments</comments>
		<pubDate>Tue, 21 Apr 2009 18:39:27 +0000</pubDate>
		<dc:creator>Grégory Guillou</dc:creator>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[DELETE]]></category>
		<category><![CDATA[INSERT]]></category>
		<category><![CDATA[merge]]></category>
		<category><![CDATA[streams]]></category>
		<category><![CDATA[write consistency]]></category>

		<guid isPermaLink="false">http://www.pythian.com/news/?p=2057</guid>
		<description><![CDATA[It&#8217;s probably worth some explanation to understand where I want to drive you: when you run an update in Oracle, the changes are made at the point that is consistent during the whole execution of the update. This allows you to run a command like the one below, even if ID is the primary key [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<title>How To Access MySQL from Oracle With ODBC and SQL</title>
		<link>http://www.pythian.com/news/1554/how-to-access-mysql-from-oracle-with-odbc-and-sql/</link>
		<comments>http://www.pythian.com/news/1554/how-to-access-mysql-from-oracle-with-odbc-and-sql/#comments</comments>
		<pubDate>Fri, 13 Mar 2009 19:21:50 +0000</pubDate>
		<dc:creator>Grégory Guillou</dc:creator>
				<category><![CDATA[MySQL]]></category>
		<category><![CDATA[Oracle]]></category>
		<category><![CDATA[PostgreSQL]]></category>
		<category><![CDATA[SQL Server]]></category>
		<category><![CDATA[dg4odbc]]></category>
		<category><![CDATA[gateway]]></category>
		<category><![CDATA[odbc]]></category>
		<category><![CDATA[utf8]]></category>

		<guid isPermaLink="false">http://www.pythian.com/news/?p=1554</guid>
		<description><![CDATA[The Oracle gateway for ODBC provides an almost seamless data integration between Oracle and other RDBMS. I won&#8217;t argue about its performance, limits, or relevance. It serves a few purposes; set it up and you&#8217;ll be able, for example, to create database links between Oracle and MySQL. After all, wouldn&#8217;t it be nice if you [...]]]></description>
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		<slash:comments>9</slash:comments>
		</item>
		<item>
		<title>How To Choose Your Oracle Database ID (DBID)</title>
		<link>http://www.pythian.com/news/1491/how-to-choose-your-oracle-database-id-dbid/</link>
		<comments>http://www.pythian.com/news/1491/how-to-choose-your-oracle-database-id-dbid/#comments</comments>
		<pubDate>Thu, 19 Feb 2009 01:20:06 +0000</pubDate>
		<dc:creator>Grégory Guillou</dc:creator>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[database]]></category>
		<category><![CDATA[dbid]]></category>
		<category><![CDATA[nid]]></category>
		<category><![CDATA[rman]]></category>

		<guid isPermaLink="false">http://www.pythian.com/blogs/1491/how-to-choose-your-oracle-database-id-dbid</guid>
		<description><![CDATA[You can choose a DBID when you rename your Oracle database. This is probably a bad, unsupported, and useless idea. I assume this hidden feature can help you to mess up all your backups. So my advice would be: &#8220;don&#8217;t use it.&#8221; I performed this test with Oracle 11.1.0.7 on Linux x86. It consists in [...]]]></description>
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		<slash:comments>6</slash:comments>
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		<item>
		<title>Oracle 11g: Multi-Column Correlation Without Extended Stats</title>
		<link>http://www.pythian.com/news/1403/oracle-11g-multi-column-correlation-without-extended-stats/</link>
		<comments>http://www.pythian.com/news/1403/oracle-11g-multi-column-correlation-without-extended-stats/#comments</comments>
		<pubDate>Mon, 24 Nov 2008 20:55:06 +0000</pubDate>
		<dc:creator>Grégory Guillou</dc:creator>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[11g]]></category>
		<category><![CDATA[cbo]]></category>
		<category><![CDATA[statistics]]></category>

		<guid isPermaLink="false">http://www.pythian.com/blogs/1403/oracle-11g-multi-column-correlation-without-extended-stats</guid>
		<description><![CDATA[Today I&#8217;ve been trying to reproduce in an 11g database one of the problems I faced with 10g&#8212;one on those problems Riyaj described in his Multi-Column Correlation and Extended Stats in Oracle 11g post. And the fun part is that I wasn&#8217;t able to reproduce it. Yet just setting optimizer_features_enable='10.2.0.4' made it show up again. [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
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		<title>Oracle Silent Mode, Part 9: Remove a Node from an 11.1 RAC database</title>
		<link>http://www.pythian.com/news/1047/oracle-silent-mode-part-9-remove-a-node-from-an-111-rac-database/</link>
		<comments>http://www.pythian.com/news/1047/oracle-silent-mode-part-9-remove-a-node-from-an-111-rac-database/#comments</comments>
		<pubDate>Tue, 28 Oct 2008 15:29:05 +0000</pubDate>
		<dc:creator>Grégory Guillou</dc:creator>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[11g]]></category>
		<category><![CDATA[dbca]]></category>
		<category><![CDATA[netca]]></category>
		<category><![CDATA[oui]]></category>
		<category><![CDATA[RAC]]></category>
		<category><![CDATA[remove node]]></category>
		<category><![CDATA[runInstaller]]></category>

		<guid isPermaLink="false">http://www.pythian.com/blogs/1047/oracle-silent-mode-part-9-remove-a-node-from-an-111-rac-database</guid>
		<description><![CDATA[This 9th post will describe how to remove a node from a 11.1 RAC cluster in silent mode. It will differ from the associated documentation in that it will allow you to remove the node even if it is not available anymore. This procedure has only a few differences from the 10.2 one in the [...]]]></description>
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		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Breaking News: How Fast Can Your Query be With Exadata?</title>
		<link>http://www.pythian.com/news/1277/how-fast-can-your-query-be-with-exadata/</link>
		<comments>http://www.pythian.com/news/1277/how-fast-can-your-query-be-with-exadata/#comments</comments>
		<pubDate>Thu, 02 Oct 2008 18:16:51 +0000</pubDate>
		<dc:creator>Grégory Guillou</dc:creator>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oracle Exadata]]></category>
		<category><![CDATA[Technical Blog]]></category>
		<category><![CDATA[11.1.0.7]]></category>
		<category><![CDATA[Oracle Exadata Storage Server]]></category>

		<guid isPermaLink="false">http://www.pythian.com/blogs/1277/how-fast-can-your-query-be-with-exadata</guid>
		<description><![CDATA[There has been a lot of buzz about the Oracle Exadata Storage Server these past few days. Did you know you can actually estimate the impact of it on some of your queries with SQL Performance Analyzer (SQLPA)? Here is the story. First you need to install an 11.1.0.7 database! Then you must load your [...]]]></description>
		<wfw:commentRss>http://www.pythian.com/news/1277/how-fast-can-your-query-be-with-exadata/feed/</wfw:commentRss>
		<slash:comments>4</slash:comments>
		</item>
		<item>
		<title>Oracle Silent Mode, Part 8: Add a Node to a 11.1 RAC Database</title>
		<link>http://www.pythian.com/news/1046/oracle-silent-mode-part-8-add-a-node-to-a-102-rac-database/</link>
		<comments>http://www.pythian.com/news/1046/oracle-silent-mode-part-8-add-a-node-to-a-102-rac-database/#comments</comments>
		<pubDate>Wed, 27 Aug 2008 16:37:16 +0000</pubDate>
		<dc:creator>Grégory Guillou</dc:creator>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[11g]]></category>
		<category><![CDATA[add node]]></category>
		<category><![CDATA[dbca]]></category>
		<category><![CDATA[netca]]></category>
		<category><![CDATA[oui]]></category>
		<category><![CDATA[RAC]]></category>

		<guid isPermaLink="false">http://www.pythian.com/blogs/1046/oracle-silent-mode-part-8-add-a-node-to-a-102-rac-database</guid>
		<description><![CDATA[The process of adding a node to a 11.1 RAC is very similar to the 10.2 process described in Part 5 of this series. For this reason, this post will just focus on what has changed between the 2 versions. Here is the complete series up to now: Installation of 10.2 And 11.1 Databases Patches [...]]]></description>
		<wfw:commentRss>http://www.pythian.com/news/1046/oracle-silent-mode-part-8-add-a-node-to-a-102-rac-database/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Oracle Silent Mode, Part 7: Installing an 11.1 RAC Database</title>
		<link>http://www.pythian.com/news/1045/oracle-silent-mode-part-7-installing-an-111-rac-database/</link>
		<comments>http://www.pythian.com/news/1045/oracle-silent-mode-part-7-installing-an-111-rac-database/#comments</comments>
		<pubDate>Thu, 14 Aug 2008 18:55:20 +0000</pubDate>
		<dc:creator>Grégory Guillou</dc:creator>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[11.1]]></category>
		<category><![CDATA[ASM]]></category>
		<category><![CDATA[clusterware]]></category>
		<category><![CDATA[dbca]]></category>
		<category><![CDATA[netca]]></category>
		<category><![CDATA[oui]]></category>
		<category><![CDATA[RAC]]></category>
		<category><![CDATA[runInstaller]]></category>
		<category><![CDATA[silent]]></category>

		<guid isPermaLink="false">http://www.pythian.com/blogs/1045/oracle-silent-mode-part-7-installing-an-111-rac-database</guid>
		<description><![CDATA[This seventh post digs into some of the silent installation commands of an 11.1 RAC. For a complete series agenda up to now, see below: Installation of 10.2 And 11.1 Databases Patches of 10.2 And 11.1 databases Cloning Software and databases Install a 10.2 RAC Database Add a Node to a 10.2 RAC database Remove [...]]]></description>
		<wfw:commentRss>http://www.pythian.com/news/1045/oracle-silent-mode-part-7-installing-an-111-rac-database/feed/</wfw:commentRss>
		<slash:comments>8</slash:comments>
		</item>
		<item>
		<title>Consistent Gets not Necessarily the Best Way to Look at Query Performance</title>
		<link>http://www.pythian.com/news/1171/consistent-gets-not-necessarily-best-way-to-look-at-query-performance/</link>
		<comments>http://www.pythian.com/news/1171/consistent-gets-not-necessarily-best-way-to-look-at-query-performance/#comments</comments>
		<pubDate>Wed, 13 Aug 2008 13:56:12 +0000</pubDate>
		<dc:creator>Grégory Guillou</dc:creator>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Consistent Gets]]></category>
		<category><![CDATA[Hash Join]]></category>
		<category><![CDATA[Trust]]></category>
		<category><![CDATA[tuning]]></category>

		<guid isPermaLink="false">http://www.pythian.com/blogs/1171/consistent-gets-not-necessarily-best-way-to-look-at-query-performance</guid>
		<description><![CDATA[This post is for those who think Consistent Gets is the only thing that matters. It&#8217;s not. That&#8217;s why Statspack and AWR provide not only the top queries sorted by Consistent Gets but also Sorted by IO, CPU, Cluster Waits, and so on. I won&#8217;t argue. Check for yourself. I&#8217;ve run the queries that follow [...]]]></description>
		<wfw:commentRss>http://www.pythian.com/news/1171/consistent-gets-not-necessarily-best-way-to-look-at-query-performance/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>Oracle Silent Mode, Part 6: Removing a Node From a 10.2 RAC</title>
		<link>http://www.pythian.com/news/1044/oracle-silent-mode-part-6-remove-a-node-from-a-102-rac/</link>
		<comments>http://www.pythian.com/news/1044/oracle-silent-mode-part-6-remove-a-node-from-a-102-rac/#comments</comments>
		<pubDate>Wed, 09 Jul 2008 16:11:40 +0000</pubDate>
		<dc:creator>Grégory Guillou</dc:creator>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[SQL Server]]></category>
		<category><![CDATA[10.2]]></category>
		<category><![CDATA[cluster]]></category>
		<category><![CDATA[dbca]]></category>
		<category><![CDATA[netca]]></category>
		<category><![CDATA[oui]]></category>
		<category><![CDATA[RAC]]></category>
		<category><![CDATA[remove node]]></category>

		<guid isPermaLink="false">http://www.pythian.com/blogs/1044/oracle-silent-mode-part-6-remove-a-node-from-a-102-rac</guid>
		<description><![CDATA[This sixth post describes how to remove a node from a 10.2 RAC cluster in silent mode. It differs from the associated documentation in that it will show how to remove a node, even if it has been made unavailable for any reason, including an error by a DBA or a SA. Here is the [...]]]></description>
		<wfw:commentRss>http://www.pythian.com/news/1044/oracle-silent-mode-part-6-remove-a-node-from-a-102-rac/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
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