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		<link>http://hourim.wordpress.com</link>
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		<item>
		<title>Bitmap Indexes and Foreign key</title>
		<link>http://hourim.wordpress.com/2012/01/19/bitmap-indexes-and-foreign-key/</link>
		<comments>http://hourim.wordpress.com/2012/01/19/bitmap-indexes-and-foreign-key/#comments</comments>
		<pubDate>Thu, 19 Jan 2012 12:09:45 +0000</pubDate>
		<dc:creator>hourim</dc:creator>
				<category><![CDATA[Deadlock]]></category>

		<guid isPermaLink="false">http://hourim.wordpress.com/?p=633</guid>
		<description><![CDATA[1.     Introduction Several months ago I have published a sql script that checks the existence or the absence of an index covering the deadlock threat of unindexed foreign key constraint when DML are issued against the parent table. That script doesn’t bother about the index type. If an index of a bitmap type exists it [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=hourim.wordpress.com&amp;blog=761114&amp;post=633&amp;subd=hourim&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
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			<media:title type="html">hourim</media:title>
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		<title>Getting Explain Plan</title>
		<link>http://hourim.wordpress.com/2011/12/29/getting-explain-plan/</link>
		<comments>http://hourim.wordpress.com/2011/12/29/getting-explain-plan/#comments</comments>
		<pubDate>Thu, 29 Dec 2011 15:04:19 +0000</pubDate>
		<dc:creator>hourim</dc:creator>
				<category><![CDATA[explain plan]]></category>

		<guid isPermaLink="false">http://hourim.wordpress.com/?p=598</guid>
		<description><![CDATA[1. Introduction In order to tune a query you need first to get its real execution plan that describes the operations dictated by the Oracle optimizer and followed by the SQL engine to execute this query. It can’t be enough emphasized that getting the exact explain plan (and not the expected one) represents an important step when troubleshooting query performance problems. This [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=hourim.wordpress.com&amp;blog=761114&amp;post=598&amp;subd=hourim&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
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		<title>On tuning via explain plan</title>
		<link>http://hourim.wordpress.com/2011/12/22/on-tuning-via-explain-plan/</link>
		<comments>http://hourim.wordpress.com/2011/12/22/on-tuning-via-explain-plan/#comments</comments>
		<pubDate>Thu, 22 Dec 2011 16:46:14 +0000</pubDate>
		<dc:creator>hourim</dc:creator>
				<category><![CDATA[explain plan]]></category>

		<guid isPermaLink="false">http://hourim.wordpress.com/?p=566</guid>
		<description><![CDATA[Explain plan taken from memory, i.e. explain plan generated by the dbms_xplan.display_cursor () function, contains important information such as where time is most spent by the related query operations and, hence, on which operations the tuning effort should be concentrated.   As far as it is well known that a picture is worth a thousand words, [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=hourim.wordpress.com&amp;blog=761114&amp;post=566&amp;subd=hourim&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
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		<title>DBMS_XPLAN : Starts in action</title>
		<link>http://hourim.wordpress.com/2011/10/10/dbms_xplan-starts-in-action/</link>
		<comments>http://hourim.wordpress.com/2011/10/10/dbms_xplan-starts-in-action/#comments</comments>
		<pubDate>Mon, 10 Oct 2011 12:50:39 +0000</pubDate>
		<dc:creator>hourim</dc:creator>
				<category><![CDATA[explain plan]]></category>

		<guid isPermaLink="false">http://hourim.wordpress.com/?p=548</guid>
		<description><![CDATA[Very often, if not always, I am advocating the use of in order to    Get the real explain plan and not the approximate onet  Judge about the Estimations the CBO is doing And today I want to add             3.  See if an operation has been started or not by the CBO Here below a [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=hourim.wordpress.com&amp;blog=761114&amp;post=548&amp;subd=hourim&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
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		<title>Deadlock – Part 3: Non Indexed Foreign key in action</title>
		<link>http://hourim.wordpress.com/2011/09/07/deadlock-%e2%80%93-part-3-non-indexed-foreign-key-in-action/</link>
		<comments>http://hourim.wordpress.com/2011/09/07/deadlock-%e2%80%93-part-3-non-indexed-foreign-key-in-action/#comments</comments>
		<pubDate>Wed, 07 Sep 2011 12:46:27 +0000</pubDate>
		<dc:creator>hourim</dc:creator>
				<category><![CDATA[Deadlock]]></category>

		<guid isPermaLink="false">http://hourim.wordpress.com/?p=531</guid>
		<description><![CDATA[A recent question on otn about deadlock came up last week. The deadlock graph was as such that I was wondering if I have already encountered it before. Albeit it is an incomplete deadlock graph because it doesn’t present the type of sql session 197 and 1835 were executing before they deadlocked, we can point [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=hourim.wordpress.com&amp;blog=761114&amp;post=531&amp;subd=hourim&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://hourim.wordpress.com/2011/09/07/deadlock-%e2%80%93-part-3-non-indexed-foreign-key-in-action/feed/</wfw:commentRss>
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			<media:title type="html">hourim</media:title>
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		<title>Special Merge</title>
		<link>http://hourim.wordpress.com/2011/08/06/special-merge/</link>
		<comments>http://hourim.wordpress.com/2011/08/06/special-merge/#comments</comments>
		<pubDate>Sat, 06 Aug 2011 15:50:29 +0000</pubDate>
		<dc:creator>hourim</dc:creator>
				<category><![CDATA[Oracle]]></category>

		<guid isPermaLink="false">http://hourim.wordpress.com/?p=505</guid>
		<description><![CDATA[An interesting question came up on the otn thread ( http://forums.oracle.com/forums/thread.jspa?messageID=9772504&#38;#9772504) a couple of days ago. The original poster was asking on how to avoid superfluous updates when using the MERGE command. He said that he wants the update to start only if one of the columns to be matched has been changed; otherwise he would [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=hourim.wordpress.com&amp;blog=761114&amp;post=505&amp;subd=hourim&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
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			<media:title type="html">hourim</media:title>
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		<title>On the use of dbms_metadata.get_ddl</title>
		<link>http://hourim.wordpress.com/2011/08/06/on-the-use-of-dbms_metadata-get_ddl/</link>
		<comments>http://hourim.wordpress.com/2011/08/06/on-the-use-of-dbms_metadata-get_ddl/#comments</comments>
		<pubDate>Sat, 06 Aug 2011 15:48:11 +0000</pubDate>
		<dc:creator>hourim</dc:creator>
				<category><![CDATA[Oracle]]></category>

		<guid isPermaLink="false">http://hourim.wordpress.com/?p=511</guid>
		<description><![CDATA[A question recently came into an oracle French forum (http://www.developpez.net/forums/d1117051/bases-donnees/oracle/source-vue-format-text/)  asking about how to get a DDL of views containing a given text I thought it is worth writing here the English translation of my French answer to that thread. I will start by creating a view in which I will use the term ‘Mohamed’ [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=hourim.wordpress.com&amp;blog=761114&amp;post=511&amp;subd=hourim&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://hourim.wordpress.com/2011/08/06/on-the-use-of-dbms_metadata-get_ddl/feed/</wfw:commentRss>
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			<media:title type="html">hourim</media:title>
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		<title>Extracting separate information from a character string</title>
		<link>http://hourim.wordpress.com/2011/07/15/extracting-separate-information-from-a-character-string/</link>
		<comments>http://hourim.wordpress.com/2011/07/15/extracting-separate-information-from-a-character-string/#comments</comments>
		<pubDate>Fri, 15 Jul 2011 09:01:26 +0000</pubDate>
		<dc:creator>hourim</dc:creator>
				<category><![CDATA[PL/SQL]]></category>

		<guid isPermaLink="false">http://hourim.wordpress.com/?p=485</guid>
		<description><![CDATA[I have been recently asked to develop a pl/sql stored procedure in order to dequeue a payload message from an Oracle Advanced queue. It was a text message. Don’t ask me why they didn’t foresee an object type for that purpose, I did asked the same question and I have been told that this is [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=hourim.wordpress.com&amp;blog=761114&amp;post=485&amp;subd=hourim&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
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			<media:title type="html">hourim</media:title>
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		<title>Using Function Based index appropriately</title>
		<link>http://hourim.wordpress.com/2011/07/03/using-function-based-index-appropriately/</link>
		<comments>http://hourim.wordpress.com/2011/07/03/using-function-based-index-appropriately/#comments</comments>
		<pubDate>Sun, 03 Jul 2011 11:48:39 +0000</pubDate>
		<dc:creator>hourim</dc:creator>
				<category><![CDATA[Index]]></category>

		<guid isPermaLink="false">http://hourim.wordpress.com/?p=454</guid>
		<description><![CDATA[Very often requests to enhance performance of queries resembling to the following one: populate forums like OTN. Requesters have already created an index on the flag column  and are complaining about the query which is not performing well and which is not using the index they created to cover the  flag where clause column. The main [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=hourim.wordpress.com&amp;blog=761114&amp;post=454&amp;subd=hourim&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
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			<media:title type="html">hourim</media:title>
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		<title>Bind variable, shared pool and cursor sharing parameter</title>
		<link>http://hourim.wordpress.com/2011/06/16/bind-variable-shared-pool-and-cursor-sharing-parameter/</link>
		<comments>http://hourim.wordpress.com/2011/06/16/bind-variable-shared-pool-and-cursor-sharing-parameter/#comments</comments>
		<pubDate>Thu, 16 Jun 2011 18:23:49 +0000</pubDate>
		<dc:creator>hourim</dc:creator>
				<category><![CDATA[Trouble shooting]]></category>

		<guid isPermaLink="false">http://hourim.wordpress.com/?p=430</guid>
		<description><![CDATA[I was asked to investigate a real life production problem concerning the shared pool (library cache) of the SGA which come to be full so that the only solution which remains available was to stop and restart the data base.  I did immediately start thinking if I have not already been confronted to a similar [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=hourim.wordpress.com&amp;blog=761114&amp;post=430&amp;subd=hourim&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
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