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	<title>Alberto Dell'Era's Oracle blog</title>
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	<link>http://www.adellera.it/blog</link>
	<description>A blog about Oracle - Un blog riguardo Oracle</description>
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		<title>Tom Kyte in Italia &#8211; 5 Aprile 2011</title>
		<link>http://www.adellera.it/blog/2011/05/01/tom-kyte-in-italia-5-aprile-2011/</link>
		<comments>http://www.adellera.it/blog/2011/05/01/tom-kyte-in-italia-5-aprile-2011/#comments</comments>
		<pubDate>Sun, 01 May 2011 15:38:08 +0000</pubDate>
		<dc:creator>Alberto Dell'Era</dc:creator>
				<category><![CDATA[Social Events]]></category>
		<category><![CDATA[Technical Meetings]]></category>

		<guid isPermaLink="false">http://www.adellera.it/blog/?p=467</guid>
		<description><![CDATA[[Note: I'm writing in Italian since this post is about a local event] 
Anche quest'anno Thomas "Tom" Kyte, il "Tom dietro asktom.oracle.com" e autore di diversi libri, è tornato in Italia per tenere una delle sue conferenze ricorrenti più popolari (ecco le slides) - quella sulle features più significative della versione corrente di Oracle (quindi [...]]]></description>
		<wfw:commentRss>http://www.adellera.it/blog/2011/05/01/tom-kyte-in-italia-5-aprile-2011/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Xtrace: an Oracle session trace browser &#8211; exec flow</title>
		<link>http://www.adellera.it/blog/2010/05/17/xtrace-an-oracle-session-trace-browser-exec-flow/</link>
		<comments>http://www.adellera.it/blog/2010/05/17/xtrace-an-oracle-session-trace-browser-exec-flow/#comments</comments>
		<pubDate>Mon, 17 May 2010 14:21:06 +0000</pubDate>
		<dc:creator>Alberto Dell'Era</dc:creator>
				<category><![CDATA[xtrace]]></category>

		<guid isPermaLink="false">http://www.adellera.it/blog/?p=448</guid>
		<description><![CDATA[Tracing a session is extremely useful when you need to investigate how  a client interacts with the database - the client could be an application of yours, a third-party application, or an Oracle module such as dbms_stats or dbms_mview.  To get the perfect picture of the client-server dialogue,  you "simply" need to consider all EXEC lines in the trace file, and associate to each line the executed statement and the bind variable values; a very tedious and error-prone task  when done manually, that <a href="http://www.adellera.it/xtrace">Xtrace</a>  can make for you (and for free).]]></description>
		<wfw:commentRss>http://www.adellera.it/blog/2010/05/17/xtrace-an-oracle-session-trace-browser-exec-flow/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>An improved OakTable web site</title>
		<link>http://www.adellera.it/blog/2010/04/23/an-improved-oaktable-web-site/</link>
		<comments>http://www.adellera.it/blog/2010/04/23/an-improved-oaktable-web-site/#comments</comments>
		<pubDate>Fri, 23 Apr 2010 14:48:43 +0000</pubDate>
		<dc:creator>Alberto Dell'Era</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://www.adellera.it/blog/?p=441</guid>
		<description><![CDATA[Today the new OakTable web site, www.oaktable.net, has been published: many thanks to Kurt Van Meerbeeck (that I'm told worked the most on the site), James Morle and Marco Gralike!
I really like (besides the light and modern look) the aggregator of the OakTable members' blogs - a window on high-quality news and investigations about Oracle [...]]]></description>
		<wfw:commentRss>http://www.adellera.it/blog/2010/04/23/an-improved-oaktable-web-site/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Xtrace: an Oracle session trace browser (introduction)</title>
		<link>http://www.adellera.it/blog/2010/04/08/xtrace-an-oracle-session-trace-browser-introduction/</link>
		<comments>http://www.adellera.it/blog/2010/04/08/xtrace-an-oracle-session-trace-browser-introduction/#comments</comments>
		<pubDate>Thu, 08 Apr 2010 16:23:17 +0000</pubDate>
		<dc:creator>Alberto Dell'Era</dc:creator>
				<category><![CDATA[xtrace]]></category>

		<guid isPermaLink="false">http://www.adellera.it/blog/?p=435</guid>
		<description><![CDATA[<a href="http://www.adellera.it/xtrace">Xtrace</a> is a graphical tool that can navigate Oracle trace files, manipulate them, and optionally get them back as a text file. It actually makes (much) more, but in this first post we are going to focus on its basic browsing capabilities.]]></description>
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		<slash:comments>4</slash:comments>
		</item>
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		<title>fast refresh of join-only MVs: _mv_refresh_use_stats and locking log stats</title>
		<link>http://www.adellera.it/blog/2010/03/11/fast-refresh-of-join-only-mvs-_mv_refresh_use_stats-and-locking-log-stats/</link>
		<comments>http://www.adellera.it/blog/2010/03/11/fast-refresh-of-join-only-mvs-_mv_refresh_use_stats-and-locking-log-stats/#comments</comments>
		<pubDate>Thu, 11 Mar 2010 20:46:16 +0000</pubDate>
		<dc:creator>Alberto Dell'Era</dc:creator>
				<category><![CDATA[materialized views]]></category>
		<category><![CDATA[performance tuning]]></category>

		<guid isPermaLink="false">http://www.adellera.it/blog/?p=426</guid>
		<description><![CDATA[A devastating performance degradation of materialized view fast refreshes can happen in versions after 9i - and can be healed rather easily by simply setting the hidden parameter _mv_refresh_use_stats or, a bit surprisingly, by locking statistics on the logs. The problem can manifest at least in the currently-latest patchsets of 10g, 11gR1 and 11gR2 (10.2.0.4, [...]]]></description>
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		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>xplan: dbms_metadata.get_ddl for tables referenced by the plan</title>
		<link>http://www.adellera.it/blog/2010/02/09/xplan-dbms_metadataget_ddl-for-tables-referenced-by-the-plan/</link>
		<comments>http://www.adellera.it/blog/2010/02/09/xplan-dbms_metadataget_ddl-for-tables-referenced-by-the-plan/#comments</comments>
		<pubDate>Tue, 09 Feb 2010 15:59:40 +0000</pubDate>
		<dc:creator>Alberto Dell'Era</dc:creator>
				<category><![CDATA[performance tuning]]></category>
		<category><![CDATA[tools]]></category>
		<category><![CDATA[xplan]]></category>

		<guid isPermaLink="false">http://www.adellera.it/blog/?p=417</guid>
		<description><![CDATA[As a minor but useful new feature, xplan is now able to integrate into its report the DDL of tables (and indexes) referenced by the plan, calling dbms_metadata.get_ddl transparently. 
This is mostly useful to get more details about referenced tables' constraints and partitions definition - to complement their CBO-related statistics that xplan reports about.
This feature [...]]]></description>
		<wfw:commentRss>http://www.adellera.it/blog/2010/02/09/xplan-dbms_metadataget_ddl-for-tables-referenced-by-the-plan/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>tweet &#8230;</title>
		<link>http://www.adellera.it/blog/2010/01/06/tweet/</link>
		<comments>http://www.adellera.it/blog/2010/01/06/tweet/#comments</comments>
		<pubDate>Wed, 06 Jan 2010 21:57:31 +0000</pubDate>
		<dc:creator>Alberto Dell'Era</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://www.adellera.it/blog/?p=399</guid>
		<description><![CDATA[For people that have asked - I'm not blogging simply because I'm feverishly working on a tool of mine that I'm very fond of :)
Guess what it does from the following next two screenshots ...


]]></description>
		<wfw:commentRss>http://www.adellera.it/blog/2010/01/06/tweet/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>11gR2: new algorithm for fast refresh of on-commit materialized views</title>
		<link>http://www.adellera.it/blog/2009/11/22/11gr2-new-algorithm-for-fast-refresh-of-on-commit-materialized-views/</link>
		<comments>http://www.adellera.it/blog/2009/11/22/11gr2-new-algorithm-for-fast-refresh-of-on-commit-materialized-views/#comments</comments>
		<pubDate>Sun, 22 Nov 2009 15:56:28 +0000</pubDate>
		<dc:creator>Alberto Dell'Era</dc:creator>
				<category><![CDATA[materialized views]]></category>
		<category><![CDATA[performance tuning]]></category>

		<guid isPermaLink="false">http://www.adellera.it/blog/?p=385</guid>
		<description><![CDATA[This post investigates the improvements that have been made in 11gR2 to the fast refresh engine of materialized views (MVs) that are set to be automatically refreshed at commit time. We speak about join-only materialized views only in this post, as always with the help of a test case.
As noted in the post of mine [...]]]></description>
		<wfw:commentRss>http://www.adellera.it/blog/2009/11/22/11gr2-new-algorithm-for-fast-refresh-of-on-commit-materialized-views/feed/</wfw:commentRss>
		<slash:comments>8</slash:comments>
		</item>
		<item>
		<title>11gR2: materialized view logs changes</title>
		<link>http://www.adellera.it/blog/2009/11/03/11gr2-materialized-view-logs-changes/</link>
		<comments>http://www.adellera.it/blog/2009/11/03/11gr2-materialized-view-logs-changes/#comments</comments>
		<pubDate>Tue, 03 Nov 2009 17:20:51 +0000</pubDate>
		<dc:creator>Alberto Dell'Era</dc:creator>
				<category><![CDATA[materialized views]]></category>

		<guid isPermaLink="false">http://www.adellera.it/blog/?p=376</guid>
		<description><![CDATA[In this post we are going to discuss some 11gR2 changes to materialized view logs that are aimed at increasing the performance of the fast-refresh engine of materialized views (MVs), especially the on-commit variant. 
The MV logs, in 10gr2, now comes in two flavours: the traditional (and still the default) timestamp-based one and the brand [...]]]></description>
		<wfw:commentRss>http://www.adellera.it/blog/2009/11/03/11gr2-materialized-view-logs-changes/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>CBO: NewDensity for Frequency Histograms,11g-10.2.0.4 (densities part IV)</title>
		<link>http://www.adellera.it/blog/2009/10/23/cbo-newdensity-for-frequency-histograms11g-10204-densities-part-iv/</link>
		<comments>http://www.adellera.it/blog/2009/10/23/cbo-newdensity-for-frequency-histograms11g-10204-densities-part-iv/#comments</comments>
		<pubDate>Fri, 23 Oct 2009 16:07:04 +0000</pubDate>
		<dc:creator>Alberto Dell'Era</dc:creator>
				<category><![CDATA[CBO]]></category>

		<guid isPermaLink="false">http://www.adellera.it/blog/?p=352</guid>
		<description><![CDATA[As we have seen in the previous posts of this series, in 11g a new figure named "NewDensity" has been introduced as a replacement for the "density" column statistic for columns whose histogram has been collected; this change has been backported in 10.2.0.4 also. 
In the previous post we discussed how NewDensity influences the CBO [...]]]></description>
		<wfw:commentRss>http://www.adellera.it/blog/2009/10/23/cbo-newdensity-for-frequency-histograms11g-10204-densities-part-iv/feed/</wfw:commentRss>
		<slash:comments>5</slash:comments>
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