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	<title>Richard Foote's Oracle Blog</title>
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	<description>Focusing Specifically On Oracle Indexes, Database Administration and Some Great Music</description>
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		<title>Richard Foote's Oracle Blog</title>
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		<item>
		<title>Index Organized Tables &#8211; Overflow Segment Part II (The Loneliest Guy)</title>
		<link>http://richardfoote.wordpress.com/2012/01/18/index-organized-tables-overflow-segment-part-ii-the-loneliest-guy/</link>
		<comments>http://richardfoote.wordpress.com/2012/01/18/index-organized-tables-overflow-segment-part-ii-the-loneliest-guy/#comments</comments>
		<pubDate>Wed, 18 Jan 2012 09:57:00 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[Block Dumps]]></category>
		<category><![CDATA[Index Internals]]></category>
		<category><![CDATA[Index Organized Tables]]></category>
		<category><![CDATA[IOT]]></category>
		<category><![CDATA[Oracle Indexes]]></category>
		<category><![CDATA[Overflow Segment]]></category>
		<category><![CDATA[Primary Key]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1867</guid>
		<description><![CDATA[In my previous post on Index Organized Tables (IOT), I introduced the concept of the IOT Overflow Segment, where we can store columns that we may not want to include within the actual IOT index structure. Before we move on, I just wanted to cover off a few additional points that could be a trap for the [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1867&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2012/01/18/index-organized-tables-overflow-segment-part-ii-the-loneliest-guy/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
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		<item>
		<title>Index Organized Tables &#8211; Overflow Segment (Shadow Man)</title>
		<link>http://richardfoote.wordpress.com/2012/01/13/index-organized-tables-overflow-segment-shadow-man/</link>
		<comments>http://richardfoote.wordpress.com/2012/01/13/index-organized-tables-overflow-segment-shadow-man/#comments</comments>
		<pubDate>Fri, 13 Jan 2012 05:05:10 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[Block Dumps]]></category>
		<category><![CDATA[Index Internals]]></category>
		<category><![CDATA[Index Organized Tables]]></category>
		<category><![CDATA[IOT]]></category>
		<category><![CDATA[Oracle Indexes]]></category>
		<category><![CDATA[Overflow Segment]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1849</guid>
		<description><![CDATA[In my previous introductory IOT post, I illustrated how an Index Organized Table (IOT) might be worth consideration if most or all columns in a table were to be included within an index. I&#8217;m going to use a slightly different demo this time, replacing one of the columns with a much larger DESCRIPTION column, one which [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1849&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2012/01/13/index-organized-tables-overflow-segment-shadow-man/feed/</wfw:commentRss>
		<slash:comments>8</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
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		<title>Index Organized Tables &#8211; An Introduction Of Sorts (Pyramid Song)</title>
		<link>http://richardfoote.wordpress.com/2012/01/10/index-organized-tables-an-introduction-of-sorts-pyramid-song/</link>
		<comments>http://richardfoote.wordpress.com/2012/01/10/index-organized-tables-an-introduction-of-sorts-pyramid-song/#comments</comments>
		<pubDate>Tue, 10 Jan 2012 06:38:11 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[Block Dumps]]></category>
		<category><![CDATA[CBO]]></category>
		<category><![CDATA[Index Internals]]></category>
		<category><![CDATA[Index Organized Tables]]></category>
		<category><![CDATA[IOT]]></category>
		<category><![CDATA[Oracle Indexes]]></category>
		<category><![CDATA[Primary Key]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1835</guid>
		<description><![CDATA[Thought it was high time that I covered in a little detail the subject of Index Organized Tables (IOTs). When used appropriately, they can be an extremely useful method of storing and accessing data. Hopefully by the end of this series, you&#8217;ll have a better understanding of IOTs, their respective strengths and weaknesses and so perhaps [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1835&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2012/01/10/index-organized-tables-an-introduction-of-sorts-pyramid-song/feed/</wfw:commentRss>
		<slash:comments>8</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
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		<item>
		<title>Curious Case Of The Ever Increasing Index Solution (A Big Hurt)</title>
		<link>http://richardfoote.wordpress.com/2012/01/05/curious-case-of-the-ever-increasing-index-solution-a-big-hurt/</link>
		<comments>http://richardfoote.wordpress.com/2012/01/05/curious-case-of-the-ever-increasing-index-solution-a-big-hurt/#comments</comments>
		<pubDate>Thu, 05 Jan 2012 04:37:12 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[ASSM]]></category>
		<category><![CDATA[Indexing Myth]]></category>
		<category><![CDATA[Oracle Indexes]]></category>
		<category><![CDATA[Quiz]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1829</guid>
		<description><![CDATA[Based on the excellent comments in the Quiz post, we have some clever cookies out there I guess the first thing to point out is that based in the basic scenario provided, the index shouldn&#8217;t ordinarily be continually growing in this fashion. Although the index values are monotonically increasing, the deletions are leaving behind fully emptied leaf blocks which [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1829&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2012/01/05/curious-case-of-the-ever-increasing-index-solution-a-big-hurt/feed/</wfw:commentRss>
		<slash:comments>5</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
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	</item>
		<item>
		<title>Curious Case Of The Ever Increasing Index Quiz (She&#8217;ll Drive The Big Car)</title>
		<link>http://richardfoote.wordpress.com/2012/01/04/curious-case-of-the-ever-increasing-index-quiz-shell-drive-the-big-car/</link>
		<comments>http://richardfoote.wordpress.com/2012/01/04/curious-case-of-the-ever-increasing-index-quiz-shell-drive-the-big-car/#comments</comments>
		<pubDate>Wed, 04 Jan 2012 00:24:26 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[Index Internals]]></category>
		<category><![CDATA[Indexing Myth]]></category>
		<category><![CDATA[Oracle Indexes]]></category>
		<category><![CDATA[Quiz]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1815</guid>
		<description><![CDATA[I received an email recently that had a nice example of what can potentially go wrong with an index. Let&#8217;s first create a simple table with a unique index and populate it with 200,000 rows (following demo run on 11.2.0.1): So far, everything is as expected. With have an index with 200,000 rows that currently has [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1815&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2012/01/04/curious-case-of-the-ever-increasing-index-quiz-shell-drive-the-big-car/feed/</wfw:commentRss>
		<slash:comments>22</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
		</media:content>
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		<item>
		<title>Index Organized Tables &#8211; A Start (Star)</title>
		<link>http://richardfoote.wordpress.com/2012/01/03/index-orgnaized-tables-a-start-star/</link>
		<comments>http://richardfoote.wordpress.com/2012/01/03/index-orgnaized-tables-a-start-star/#comments</comments>
		<pubDate>Tue, 03 Jan 2012 05:27:07 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[Index Organized Tables]]></category>
		<category><![CDATA[Oracle Indexes]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1806</guid>
		<description><![CDATA[Happy New Year !! As has been mentioned to me on quite a number of occasions, I&#8217;ve haven&#8217;t really covered the area of Index Organized Tables (IOTs) on this blog. This despite covering the subject of IOTs in quite some detail in my Index Internals Seminar. Which I readily admit is a bit of a shame as [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1806&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2012/01/03/index-orgnaized-tables-a-start-star/feed/</wfw:commentRss>
		<slash:comments>8</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
		</media:content>
	</item>
		<item>
		<title>Merry Christmas (plus long lost &#8220;The Jean Genie&#8221;)</title>
		<link>http://richardfoote.wordpress.com/2011/12/24/merry-christmas-plus-long-lost-the-jean-genie/</link>
		<comments>http://richardfoote.wordpress.com/2011/12/24/merry-christmas-plus-long-lost-the-jean-genie/#comments</comments>
		<pubDate>Sat, 24 Dec 2011 05:58:14 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[Christmas]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1798</guid>
		<description><![CDATA[I just want to wish you all a very Merry Christmas and a very happy, safe and successful New Year. As always, thank you all so much for supporting the blog, with all your comments and nice feedback. Hopefully, you&#8217;ve found content here that has been of some use. Now that I&#8217;m back at Oracle [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1798&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2011/12/24/merry-christmas-plus-long-lost-the-jean-genie/feed/</wfw:commentRss>
		<slash:comments>9</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
		</media:content>
	</item>
		<item>
		<title>Back At Oracle Corporation (The Return Of The Thin White Duke)</title>
		<link>http://richardfoote.wordpress.com/2011/11/30/back-at-oracle-corporation-the-return-of-the-thin-white-duke/</link>
		<comments>http://richardfoote.wordpress.com/2011/11/30/back-at-oracle-corporation-the-return-of-the-thin-white-duke/#comments</comments>
		<pubDate>Wed, 30 Nov 2011 06:54:24 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[Richard's Musings]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1789</guid>
		<description><![CDATA[I&#8217;ve been very quiet on the blogging front lately, so apologies for that. One of the main reasons is that after a period of nearly 10 years, I&#8217;ve decided to take up a position back at Oracle Corporation as a &#8220;Principal Solutions Consultant&#8221; in sunny Canberra. So things have been rather hectic, finishing up in [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1789&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2011/11/30/back-at-oracle-corporation-the-return-of-the-thin-white-duke/feed/</wfw:commentRss>
		<slash:comments>30</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
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		<title>Why Are My Indexes Still Valid Solution (A Second Face)</title>
		<link>http://richardfoote.wordpress.com/2011/10/20/why-are-my-indexes-still-valid-solution-a-second-face/</link>
		<comments>http://richardfoote.wordpress.com/2011/10/20/why-are-my-indexes-still-valid-solution-a-second-face/#comments</comments>
		<pubDate>Thu, 20 Oct 2011 10:22:25 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[IOT]]></category>
		<category><![CDATA[Oracle Indexes]]></category>
		<category><![CDATA[Quiz]]></category>
		<category><![CDATA[Secondary Indexes]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1783</guid>
		<description><![CDATA[I&#8217;ve been so busy lately, I just haven&#8217;t had any spare time to post. For now, the quick answer to the last quiz is that the second table was indeed an Index Organized Table (IOT). One of the nice benefits of an IOT is that when re-organised, unlike a Heap Table, all indexes remain valid, [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1783&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2011/10/20/why-are-my-indexes-still-valid-solution-a-second-face/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
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		<title>Why Are My Indexes Still Valid Quiz ? (Move On)</title>
		<link>http://richardfoote.wordpress.com/2011/10/11/why-are-my-indexes-still-valid-quiz-move-on/</link>
		<comments>http://richardfoote.wordpress.com/2011/10/11/why-are-my-indexes-still-valid-quiz-move-on/#comments</comments>
		<pubDate>Tue, 11 Oct 2011 09:26:26 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[Index Organized Tables]]></category>
		<category><![CDATA[Oracle Indexes]]></category>
		<category><![CDATA[Quiz]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1777</guid>
		<description><![CDATA[OK, this quiz is a nice easy one, the lads at work got this without too much trouble.    Normally, when you MOVE (re-org) a table, all the associated indexes become Unusable. As below:         So the indexes are now all unusable ..     However, I previously created another table called BOWIE that [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1777&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2011/10/11/why-are-my-indexes-still-valid-quiz-move-on/feed/</wfw:commentRss>
		<slash:comments>6</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
		</media:content>
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		<title>Why Is My Index Not Being Used No. 2 Solution (The Narrow Way)</title>
		<link>http://richardfoote.wordpress.com/2011/10/06/why-is-my-index-not-being-used-no-2-solution-the-narrow-way/</link>
		<comments>http://richardfoote.wordpress.com/2011/10/06/why-is-my-index-not-being-used-no-2-solution-the-narrow-way/#comments</comments>
		<pubDate>Thu, 06 Oct 2011 11:35:41 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[CBO]]></category>
		<category><![CDATA[Oracle Indexes]]></category>
		<category><![CDATA[Quiz]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1768</guid>
		<description><![CDATA[As many have identified, the first thing to point out is that the two queries are not exactly equivalent. The BETWEEN clause is equivalent to a &#8216;&#62;= and &#60;=&#8217; predicate, whereas the original query only had a &#8216;&#62; and &#60;&#8217; predicate. The additional equal conditions at each end is significant. The selectivity of the original query is basically costed [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1768&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2011/10/06/why-is-my-index-not-being-used-no-2-solution-the-narrow-way/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
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		<title>Why Is My Index Not Being Used No. 2 Quiz (Quicksand)</title>
		<link>http://richardfoote.wordpress.com/2011/10/03/why-is-my-index-not-being-used-no-2-quiz-quicksand/</link>
		<comments>http://richardfoote.wordpress.com/2011/10/03/why-is-my-index-not-being-used-no-2-quiz-quicksand/#comments</comments>
		<pubDate>Mon, 03 Oct 2011 09:27:05 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[CBO]]></category>
		<category><![CDATA[Oracle Indexes]]></category>
		<category><![CDATA[Quiz]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1764</guid>
		<description><![CDATA[I have a table that has 1M rows with dates that span 2000 days, all evenly distributed (so there are 500 rows per day for the mathematically challenged). All stats are 100% accurate and I have an index on the date column.         OK, I now select 1 day&#8217;s worth of data: [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1764&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2011/10/03/why-is-my-index-not-being-used-no-2-quiz-quicksand/feed/</wfw:commentRss>
		<slash:comments>34</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
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	</item>
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		<title>Why Is My Index Not Being Used Solution (Eclipse)</title>
		<link>http://richardfoote.wordpress.com/2011/10/01/why-is-my-index-not-being-used-solution-eclipse/</link>
		<comments>http://richardfoote.wordpress.com/2011/10/01/why-is-my-index-not-being-used-solution-eclipse/#comments</comments>
		<pubDate>Sat, 01 Oct 2011 04:42:15 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[ASSM]]></category>
		<category><![CDATA[CBO]]></category>
		<category><![CDATA[Clustering Factor]]></category>
		<category><![CDATA[Oracle Indexes]]></category>
		<category><![CDATA[Quiz]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1756</guid>
		<description><![CDATA[Well done to everyone that got the correct answer Indeed, the subtle but significant difference between the two demos was that demo one created the table in a tablespace called USER_DATA with manual segment space management (with freelists/freelist groups set to 1), while demo two created the table in a tablespace called USER_DATA1 with automatic segment space management. [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1756&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2011/10/01/why-is-my-index-not-being-used-solution-eclipse/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
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		<item>
		<title>Why Is My Index Not Being Used Quiz (Brain Damage)</title>
		<link>http://richardfoote.wordpress.com/2011/09/28/why-is-my-index-not-being-used-quiz-brain-damage/</link>
		<comments>http://richardfoote.wordpress.com/2011/09/28/why-is-my-index-not-being-used-quiz-brain-damage/#comments</comments>
		<pubDate>Wed, 28 Sep 2011 10:23:00 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[CBO]]></category>
		<category><![CDATA[Oracle Indexes]]></category>
		<category><![CDATA[Quiz]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1749</guid>
		<description><![CDATA[This one is a little different as it comes in the form of a demo (and about 1 minute to read) so you have to work a little   I create table, index and sequence:     I then create a little procedure that simply adds 100,000 rows to the table:     I then [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1749&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2011/09/28/why-is-my-index-not-being-used-quiz-brain-damage/feed/</wfw:commentRss>
		<slash:comments>9</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
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		<title>Rebuilding Indexes and the Clustering Factor Solution (Move On)</title>
		<link>http://richardfoote.wordpress.com/2011/09/25/rebuilding-indexes-and-the-clustering-factor-solution-move-on/</link>
		<comments>http://richardfoote.wordpress.com/2011/09/25/rebuilding-indexes-and-the-clustering-factor-solution-move-on/#comments</comments>
		<pubDate>Sun, 25 Sep 2011 07:52:27 +0000</pubDate>
		<dc:creator>Richard Foote</dc:creator>
				<category><![CDATA[Clustering Factor]]></category>
		<category><![CDATA[Index Rebuild]]></category>
		<category><![CDATA[Indexing Myth]]></category>
		<category><![CDATA[Oracle Indexes]]></category>
		<category><![CDATA[Quiz]]></category>
		<category><![CDATA[Reverse Key Indexes]]></category>

		<guid isPermaLink="false">http://richardfoote.wordpress.com/?p=1741</guid>
		<description><![CDATA[Excellent !! This quiz created quite a bit of debate and it was nice to sit back and read some interesting discussions. The Clustering Factor is basically the measurement of how well aligned the data in the underlining table is in relation to the index and is the number of table related I/Os required to read the entire table via a [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=richardfoote.wordpress.com&amp;blog=2301564&amp;post=1741&amp;subd=richardfoote&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://richardfoote.wordpress.com/2011/09/25/rebuilding-indexes-and-the-clustering-factor-solution-move-on/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
	
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			<media:title type="html">Richard Foote</media:title>
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