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	<title>Oracle Scratchpad</title>
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	<link>http://jonathanlewis.wordpress.com</link>
	<description>Just another Oracle weblog</description>
	<lastBuildDate>Mon, 13 Jul 2009 20:08:25 +0000</lastBuildDate>
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		<title>Oracle Scratchpad</title>
		<link>http://jonathanlewis.wordpress.com</link>
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			<item>
		<title>Judgement Day</title>
		<link>http://jonathanlewis.wordpress.com/2009/07/13/judgement-day/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/07/13/judgement-day/#comments</comments>
		<pubDate>Mon, 13 Jul 2009 19:09:46 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=1750</guid>
		<description><![CDATA[Thursday was the day for building the agenda for the UKOUG Technology and E-Business conference. 
Last year we had a conference that lasted five days and covered every product that Oracle owned. This year we&#8217;re running a series of seven separate conferences covering different areas of Oracle&#8217;s offerings;  so the Tech and EBS event is back [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=1750&subd=jonathanlewis&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/07/13/judgement-day/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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	</item>
		<item>
		<title>Statspack Skills</title>
		<link>http://jonathanlewis.wordpress.com/2009/07/10/statspack-skills/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/07/10/statspack-skills/#comments</comments>
		<pubDate>Fri, 10 Jul 2009 19:28:03 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Performance]]></category>
		<category><![CDATA[Statspack]]></category>
		<category><![CDATA[Troubleshooting]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=1711</guid>
		<description><![CDATA[I had a great time a couple of weeks ago at the  UKOUG meeting of the DBMS SIG (reported here by Coskan Gundogar). The range of presentations was good and I had a number of interesting conversations.
Of course, the exciting part for me was sitting down with a batch of Statspack and AWR reports that I [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=1711&subd=jonathanlewis&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/07/10/statspack-skills/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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	</item>
		<item>
		<title>Must Read</title>
		<link>http://jonathanlewis.wordpress.com/2009/07/10/must-read/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/07/10/must-read/#comments</comments>
		<pubDate>Fri, 10 Jul 2009 19:10:17 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=1732</guid>
		<description><![CDATA[Just a quick note to point out that Greg Rahn has just published some useful information on parallel execution (including an important addition to monitoring in 11.1)  [Edit 12/7/09: originally typed in error as 11.2]
       <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=1732&subd=jonathanlewis&ref=&feed=1" />]]></description>
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		<slash:comments>0</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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		<item>
		<title>Concatenating LOBs</title>
		<link>http://jonathanlewis.wordpress.com/2009/07/09/concatenating-lobs/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/07/09/concatenating-lobs/#comments</comments>
		<pubDate>Thu, 09 Jul 2009 18:24:54 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Infrastructure]]></category>
		<category><![CDATA[Performance]]></category>
		<category><![CDATA[Troubleshooting]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=1694</guid>
		<description><![CDATA[If you have to handle LOBs, it&#8217;s worth checking for &#8220;unusual&#8221; activity. Here&#8217;s an example of unexpected behaviour that I came across a couple of years ago.
The client had a table with data that had to be written to a flat file so that a number of other databases could import it using SQL*Loader. The [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=1694&subd=jonathanlewis&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/07/09/concatenating-lobs/feed/</wfw:commentRss>
		<slash:comments>8</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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		<item>
		<title>Distributed Queries</title>
		<link>http://jonathanlewis.wordpress.com/2009/07/01/distributed-queries/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/07/01/distributed-queries/#comments</comments>
		<pubDate>Wed, 01 Jul 2009 07:20:36 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Execution plans]]></category>
		<category><![CDATA[Hints]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=1672</guid>
		<description><![CDATA[Some time ago I wrote a note about distributed DML, pointing out that the driving_site() hint works with distributed queries but not with distributed DML; so insert as select, or create as select and so on will &#8220;ignore&#8221; the hint.
This is just a little follow-up to give you an  idea of what execution plans for distrtibuted queries [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=1672&subd=jonathanlewis&ref=&feed=1" />]]></description>
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		<slash:comments>6</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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	</item>
		<item>
		<title>Connect By</title>
		<link>http://jonathanlewis.wordpress.com/2009/06/30/connect-by/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/06/30/connect-by/#comments</comments>
		<pubDate>Tue, 30 Jun 2009 09:22:13 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=1653</guid>
		<description><![CDATA[If you have to deal with hierarchical queries (or &#8220;connect by&#8221; queries, as they&#8217;re commonly known) you might be interested in this note on the OTN Forum where someone has a problem with repeated executions of the same query (same inputs, same results, same execution plan) operating at wildly different speeds with amazing changes in [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=1653&subd=jonathanlewis&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/06/30/connect-by/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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	</item>
		<item>
		<title>Explain VIEW</title>
		<link>http://jonathanlewis.wordpress.com/2009/06/25/explain-view/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/06/25/explain-view/#comments</comments>
		<pubDate>Thu, 25 Jun 2009 19:32:42 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=165</guid>
		<description><![CDATA[A brief note on reading execution plans.


------------------------------------------------------------
&#124; Id  &#124; Operation                     &#124; Name    &#124; Time     &#124;
------------------------------------------------------------
&#124;   0 &#124; SELECT STATEMENT              &#124;         &#124; 00:00:17 &#124;
&#124;*  1 &#124;  HASH JOIN                    &#124;         &#124; 00:00:17 &#124;
&#124;   2 &#124;   VIEW                        &#124; VW_SQ_1 &#124; 00:00:01 &#124;
&#124;   3 &#124;    HASH GROUP BY              &#124;         &#124; 00:00:01 &#124;
&#124;   4 &#124;     TABLE ACCESS FULL         &#124; EMP     [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=165&subd=jonathanlewis&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/06/25/explain-view/feed/</wfw:commentRss>
		<slash:comments>12</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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		<item>
		<title>Advert</title>
		<link>http://jonathanlewis.wordpress.com/2009/06/24/advert/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/06/24/advert/#comments</comments>
		<pubDate>Wed, 24 Jun 2009 09:50:44 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=1047</guid>
		<description><![CDATA[Planning ahead for the USA:
I will be doing a one-day event (Troubleshooting) in Richmond, Virginia on Monday 26th Oct, followed by a keynote for the Virginia Oracle User Group on 27th Oct. Then I&#8217;ll be flying on to Dallas to do two more days on 28th/29th Oct. Contact John Goodhue of SpeakTech for further details [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=1047&subd=jonathanlewis&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/06/24/advert/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/08b4eccce68cd521b54671abb0442ae1?s=96&#38;d=identicon&#38;r=G" medium="image">
			<media:title type="html">Jonathan Lewis</media:title>
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		<item>
		<title>Glossary</title>
		<link>http://jonathanlewis.wordpress.com/2009/06/23/glossary/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/06/23/glossary/#comments</comments>
		<pubDate>Tue, 23 Jun 2009 11:43:24 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Infrastructure]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=1552</guid>
		<description><![CDATA[It occurred to me recently that I might be making casual use of terms whose meaning isn&#8217;t necessarily known to the less experienced user, so I&#8217;ve decided to build a glossary to supply a brief definition for each term.
It&#8217;s going to take some time to build, but I&#8217;ll try to keep adding to it whenever I [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=1552&subd=jonathanlewis&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/06/23/glossary/feed/</wfw:commentRss>
		<slash:comments>16</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/08b4eccce68cd521b54671abb0442ae1?s=96&#38;d=identicon&#38;r=G" medium="image">
			<media:title type="html">Jonathan Lewis</media:title>
		</media:content>
	</item>
		<item>
		<title>Tablespaces</title>
		<link>http://jonathanlewis.wordpress.com/2009/06/19/tablespaces/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/06/19/tablespaces/#comments</comments>
		<pubDate>Fri, 19 Jun 2009 19:08:35 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Infrastructure]]></category>
		<category><![CDATA[Troubleshooting]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=1547</guid>
		<description><![CDATA[This could nearly be one for the &#8220;ancient history&#8221; series, because it starts with a quote from that marvellous book &#8220;Practical Oracle 8i&#8221;, where I wrote in Chapter 8:
Tablespace names are never removed from the data dictionary (cluster SYS.C_TS#), and by default each tablespace entry occupies a minimum of one block in this cluster, even [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=1547&subd=jonathanlewis&ref=&feed=1" />]]></description>
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		<slash:comments>1</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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