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	<title>Oracle Scratchpad</title>
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	<link>http://jonathanlewis.wordpress.com</link>
	<description>Just another Oracle weblog</description>
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		<title>Oracle Scratchpad</title>
		<link>http://jonathanlewis.wordpress.com</link>
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		<title>ora_hash function</title>
		<link>http://jonathanlewis.wordpress.com/2009/11/21/ora_hash-function/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/11/21/ora_hash-function/#comments</comments>
		<pubDate>Sat, 21 Nov 2009 10:59:49 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=202</guid>
		<description><![CDATA[A few weeks ago I wrote a note demonstrating the way in which Oracle&#8217;s strategy for hash partitioning is engineered to give an even data distribution when the number of partitions is a power of two. In one of the follow-up comments, Christo Kutrovsky pre-empted my planned follow-up by mentioning the hashing function ora_hash() that [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=202&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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		<item>
		<title>OOW09 Video</title>
		<link>http://jonathanlewis.wordpress.com/2009/11/20/oow09-video/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/11/20/oow09-video/#comments</comments>
		<pubDate>Fri, 20 Nov 2009 19:12:17 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=2505</guid>
		<description><![CDATA[I&#8217;ve just discovered I&#8217;m on YouTube in an impromptu video interview I gave while I was at Oracle World this year. It&#8217;s only three minutes, and doesn&#8217;t have a lot of technical content, but here&#8217;s the URL.
Footnote: Rumour has it that next year the event will be rebranded as My Oracle World &#8211; implemented entirely in Flash.
&#160;
 [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=2505&subd=jonathanlewis&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/11/20/oow09-video/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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		<title>No change</title>
		<link>http://jonathanlewis.wordpress.com/2009/11/12/no-change/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/11/12/no-change/#comments</comments>
		<pubDate>Thu, 12 Nov 2009 19:50:38 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Troubleshooting]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=2494</guid>
		<description><![CDATA[Every now and again I see a note on the OTN database forum, or Metalink, or the newsgroup asking why the time taken to run a query can vary so much between executions &#8230; even when the plan didn&#8217;t change (and the bind variable used as inputs didn&#8217;t change).
Just off the top of my head, [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=2494&subd=jonathanlewis&ref=&feed=1" />]]></description>
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		<slash:comments>21</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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		<title>Index Freelists</title>
		<link>http://jonathanlewis.wordpress.com/2009/11/10/index-freelists/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/11/10/index-freelists/#comments</comments>
		<pubDate>Tue, 10 Nov 2009 19:09:24 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Indexing]]></category>
		<category><![CDATA[Infrastructure]]></category>
		<category><![CDATA[Performance]]></category>
		<category><![CDATA[Troubleshooting]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=1569</guid>
		<description><![CDATA[A few months ago Saibabu Devabhaktuni let me know of an interesting issue he had had with indexes misbehaving, and pointed me to a blog note he had written to describe it. In the note he supplies a test case where Oracle walks through hundreds of blocks on an index freelist to find a single [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=1569&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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		<item>
		<title>Did you know &#8230;</title>
		<link>http://jonathanlewis.wordpress.com/2009/11/06/did-you-know/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/11/06/did-you-know/#comments</comments>
		<pubDate>Fri, 06 Nov 2009 19:02:04 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Indexing]]></category>
		<category><![CDATA[Infrastructure]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=2470</guid>
		<description><![CDATA[&#8230; a few things about the use of index space to suprise your friends and amaze your colleagues:

If you use &#8220;bigfile&#8221; tablespaces for your tables this can result in some indexes becoming more space-efficient than they would be otherwise.
Creating tables in tablespaces built from multiple datafiles may cause some of their indexes to be less space-efficient [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=2470&subd=jonathanlewis&ref=&feed=1" />]]></description>
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		<slash:comments>4</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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		<item>
		<title>Anonymous</title>
		<link>http://jonathanlewis.wordpress.com/2009/11/04/anonymous/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/11/04/anonymous/#comments</comments>
		<pubDate>Wed, 04 Nov 2009 21:00:04 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=2458</guid>
		<description><![CDATA[From time to time I browse the comments that Akismet (the spam detector used by WordPress) has intercepted just to check that a useful comment hasn&#8217;t been unjustly labelled as spam; and a couple of days ago I was surprised to find that four comments (from the same person) had been marked as spam even [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=2458&subd=jonathanlewis&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/11/04/anonymous/feed/</wfw:commentRss>
		<slash:comments>11</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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		<item>
		<title>Back to the USA &#8211; etc.</title>
		<link>http://jonathanlewis.wordpress.com/2009/11/04/advert/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/11/04/advert/#comments</comments>
		<pubDate>Wed, 04 Nov 2009 19:30:44 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=1047</guid>
		<description><![CDATA[California, Bulgaria (yes, I know it&#8217;s not in the USA), Virginia and Texas
It&#8217;s nice after a long trip to get a few email messages from people who have heard you speak and enjoyed the experience &#8211; so thanks to the people who let me know what they thought of the seminars and presentations I&#8217;ve done [...]<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/2009/11/04/advert/feed/</wfw:commentRss>
		<slash:comments>5</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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		<item>
		<title>Foreign Keys</title>
		<link>http://jonathanlewis.wordpress.com/2009/11/03/foreign-keys-2/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/11/03/foreign-keys-2/#comments</comments>
		<pubDate>Tue, 03 Nov 2009 23:02:21 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Indexing]]></category>
		<category><![CDATA[Infrastructure]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/2009/11/03/foreign-keys-2/</guid>
		<description><![CDATA[People often create far more &#8220;foreign key&#8221; indexes than are needed &#8211; and any redundant index is a waste of several types of resources. I&#8217;ve just made some comments on an OTN thread about this topic, so rather than repeat the comments here I&#8217;ll just give you the URL.
Update 5th Nov 2009: and here&#8217;s another [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=2457&subd=jonathanlewis&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/11/03/foreign-keys-2/feed/</wfw:commentRss>
		<slash:comments>7</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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		<item>
		<title>Top Ten</title>
		<link>http://jonathanlewis.wordpress.com/2009/10/31/top-ten/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/10/31/top-ten/#comments</comments>
		<pubDate>Sat, 31 Oct 2009 22:41:00 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=2448</guid>
		<description><![CDATA[Sorry, this isn&#8217;t a posting about efficient ways of getting the first 10 rows from a result set &#8211; it&#8217;s a little note about Oracle Open World. I don&#8217;t brag very often, but sometimes it&#8217;s hard to resist.
I&#8217;ve just received an email about Openworld with the following content:
Go to Oracle OpenWorld On Demand
Get in on [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=2448&subd=jonathanlewis&ref=&feed=1" />]]></description>
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		<slash:comments>8</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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	</item>
		<item>
		<title>logging</title>
		<link>http://jonathanlewis.wordpress.com/2009/10/30/logging/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/10/30/logging/#comments</comments>
		<pubDate>Fri, 30 Oct 2009 13:02:05 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Performance]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=2437</guid>
		<description><![CDATA[I&#8217;ve just jotted down a few notes about &#8220;log file sync&#8221; waits, &#8220;log file parallel write&#8221; waits, and the nologging option in response to a question on OTN about redo activity when creating a large index. The thread is probably worth reading.
       <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=2437&subd=jonathanlewis&ref=&feed=1" />]]></description>
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		<slash:comments>4</slash:comments>
	
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			<media:title type="html">Jonathan Lewis</media:title>
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