<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
	xmlns:media="http://search.yahoo.com/mrss/"
	>

<channel>
	<title>Oracle Scratchpad</title>
	<atom:link href="http://jonathanlewis.wordpress.com/feed/" rel="self" type="application/rss+xml" />
	<link>http://jonathanlewis.wordpress.com</link>
	<description>Just another Oracle weblog</description>
	<lastBuildDate>Tue, 10 Nov 2009 19:09:24 +0000</lastBuildDate>
	<generator>http://wordpress.com/</generator>
	<language>en</language>
	<sy:updatePeriod>hourly</sy:updatePeriod>
	<sy:updateFrequency>1</sy:updateFrequency>
	<cloud domain='jonathanlewis.wordpress.com' port='80' path='/?rsscloud=notify' registerProcedure='' protocol='http-post' />
<image>
		<url>http://www.gravatar.com/blavatar/bf48d2aa5ac63a00d971f42f2f3da802?s=96&#038;d=http://s.wordpress.com/i/buttonw-com.png</url>
		<title>Oracle Scratchpad</title>
		<link>http://jonathanlewis.wordpress.com</link>
	</image>
			<item>
		<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>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/11/10/index-freelists/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/08b4eccce68cd521b54671abb0442ae1?s=96&#38;d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D96&#38;r=G" medium="image">
			<media:title type="html">Jonathan Lewis</media:title>
		</media:content>
	</item>
		<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>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/11/06/did-you-know/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/08b4eccce68cd521b54671abb0442ae1?s=96&#38;d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D96&#38;r=G" medium="image">
			<media:title type="html">Jonathan Lewis</media:title>
		</media:content>
	</item>
		<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>
	
		<media:content url="http://0.gravatar.com/avatar/08b4eccce68cd521b54671abb0442ae1?s=96&#38;d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D96&#38;r=G" medium="image">
			<media:title type="html">Jonathan Lewis</media:title>
		</media:content>
	</item>
		<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>3</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/08b4eccce68cd521b54671abb0442ae1?s=96&#38;d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D96&#38;r=G" medium="image">
			<media:title type="html">Jonathan Lewis</media:title>
		</media:content>
	</item>
		<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>
	
		<media:content url="http://0.gravatar.com/avatar/08b4eccce68cd521b54671abb0442ae1?s=96&#38;d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D96&#38;r=G" medium="image">
			<media:title type="html">Jonathan Lewis</media:title>
		</media:content>
	</item>
		<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>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/10/31/top-ten/feed/</wfw:commentRss>
		<slash:comments>7</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/08b4eccce68cd521b54671abb0442ae1?s=96&#38;d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D96&#38;r=G" medium="image">
			<media:title type="html">Jonathan Lewis</media:title>
		</media:content>
	</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>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/10/30/logging/feed/</wfw:commentRss>
		<slash:comments>4</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/08b4eccce68cd521b54671abb0442ae1?s=96&#38;d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D96&#38;r=G" medium="image">
			<media:title type="html">Jonathan Lewis</media:title>
		</media:content>
	</item>
		<item>
		<title>XStreams</title>
		<link>http://jonathanlewis.wordpress.com/2009/10/27/xstreams/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/10/27/xstreams/#comments</comments>
		<pubDate>Tue, 27 Oct 2009 19:24:37 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Infrastructure]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=2426</guid>
		<description><![CDATA[If you&#8217;re into using Streams, you may want to take a look at the latest enhancement: XStreams.
There&#8217;s a little overview, plus a couple of Java examples at the following links:

Overview/FAQ
Inbound streams data
Outbound streans data

       <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=2426&subd=jonathanlewis&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/10/27/xstreams/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/08b4eccce68cd521b54671abb0442ae1?s=96&#38;d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D96&#38;r=G" medium="image">
			<media:title type="html">Jonathan Lewis</media:title>
		</media:content>
	</item>
		<item>
		<title>Philosophy &#8211; 8</title>
		<link>http://jonathanlewis.wordpress.com/2009/10/26/philosophy-8/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/10/26/philosophy-8/#comments</comments>
		<pubDate>Mon, 26 Oct 2009 20:33:26 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=2354</guid>
		<description><![CDATA[Btree indexes vs. Bitmap indexes &#8211; the critical difference

A single B-tree index allows you to access a small amount of data very precisely.
It is the combination of a subset of the available bitmap indexes that offers the same degree of precision.

You should not be comparing the effectiveness of a bitmap index with the effectiveness of a b-tree [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=2354&subd=jonathanlewis&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/10/26/philosophy-8/feed/</wfw:commentRss>
		<slash:comments>9</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/08b4eccce68cd521b54671abb0442ae1?s=96&#38;d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D96&#38;r=G" medium="image">
			<media:title type="html">Jonathan Lewis</media:title>
		</media:content>
	</item>
		<item>
		<title>Quiz Night</title>
		<link>http://jonathanlewis.wordpress.com/2009/10/23/quiz-night-4/</link>
		<comments>http://jonathanlewis.wordpress.com/2009/10/23/quiz-night-4/#comments</comments>
		<pubDate>Fri, 23 Oct 2009 18:55:16 +0000</pubDate>
		<dc:creator>Jonathan Lewis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://jonathanlewis.wordpress.com/?p=2421</guid>
		<description><![CDATA[Okay, so it&#8217;s not night-time, or even early evening, in some parts of the world &#8211; but somewhere it&#8217;s Friday night, and Friday night is quiz night.
Now, most people are aware that the clustering_factor of an index measures the ordering (or, if you want to be slightly more accurate, the clustering) of the rows in [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=jonathanlewis.wordpress.com&blog=491988&post=2421&subd=jonathanlewis&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://jonathanlewis.wordpress.com/2009/10/23/quiz-night-4/feed/</wfw:commentRss>
		<slash:comments>17</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/08b4eccce68cd521b54671abb0442ae1?s=96&#38;d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D96&#38;r=G" medium="image">
			<media:title type="html">Jonathan Lewis</media:title>
		</media:content>
	</item>
	</channel>
</rss>