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	<title>The Pythian Blog &#187; dynamic variables</title>
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		<title>Contradiction for the Day</title>
		<link>http://www.pythian.com/news/2848/contradiction-for-the-day/</link>
		<comments>http://www.pythian.com/news/2848/contradiction-for-the-day/#comments</comments>
		<pubDate>Tue, 09 Jun 2009 20:36:07 +0000</pubDate>
		<dc:creator>Sheeri Cabral</dc:creator>
				<category><![CDATA[MySQL]]></category>
		<category><![CDATA[dynamic variables]]></category>
		<category><![CDATA[server variables]]></category>
		<category><![CDATA[variables]]></category>

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		<description><![CDATA[Today&#8217;s contradiction: MySQL has server variables named new and old. The new variable can be set per-session and globally, and is dynamic. The old variable is not dynamic, and only global in scope. Both default to FALSE in MySQL 5.1. According to the manual, the new variable: was used in MySQL 4.0 to turn on [...]]]></description>
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		<title>SHOW VARIABLES Shows Variables MySQL Does Not Know About</title>
		<link>http://www.pythian.com/news/744/show-variables-shows-variables-mysql-does-not-know-about/</link>
		<comments>http://www.pythian.com/news/744/show-variables-shows-variables-mysql-does-not-know-about/#comments</comments>
		<pubDate>Tue, 08 Jan 2008 20:31:24 +0000</pubDate>
		<dc:creator>Sheeri Cabral</dc:creator>
				<category><![CDATA[Group Blog Posts]]></category>
		<category><![CDATA[MySQL]]></category>
		<category><![CDATA[dynamic variables]]></category>
		<category><![CDATA[mysql gotchas]]></category>

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		<description><![CDATA[The listing of Dynamic System Variables on the MySQL Reference Manual&#8217;s page is supposed to show those variables you can change on-the-fly. innodb_data_home_dir is listed there as a dynamic variable, but it is not one, and trying to change it on-the-fly doesn&#8217;t work: mysql> set global innodb_data_home_dir="/data/mysql/data"; ERROR 1193 (HY000): Unknown system variable 'innodb_data_home_dir' mysql> [...]]]></description>
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