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	<title>The Pythian Blog &#187; mysql gotchas</title>
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		<title>How to tell when using INFORMATION_SCHEMA might crash your database</title>
		<link>http://www.pythian.com/news/8633/how-to-tell-when-using-information_schema-might-crash-your-database/</link>
		<comments>http://www.pythian.com/news/8633/how-to-tell-when-using-information_schema-might-crash-your-database/#comments</comments>
		<pubDate>Tue, 16 Feb 2010 21:12:38 +0000</pubDate>
		<dc:creator>Sheeri Cabral</dc:creator>
				<category><![CDATA[MySQL]]></category>
		<category><![CDATA[Technical Blog]]></category>
		<category><![CDATA[crash]]></category>
		<category><![CDATA[information_schema]]></category>
		<category><![CDATA[mysql gotchas]]></category>
		<category><![CDATA[optimization]]></category>
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		<description><![CDATA[There are those that are very adamant about letting people know that using INFORMATION_SCHEMA can crash your database. For example, in making changes to many tables at once Baron writes: &#8220;querying the INFORMATION_SCHEMA database on MySQL can completely lock a busy server for a long time. It can even crash it. It is very dangerous.&#8221; [...]]]></description>
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		<title>MySQL: my.ini Gotcha on Windows</title>
		<link>http://www.pythian.com/news/1296/mysql-myini-gotcha-on-windows/</link>
		<comments>http://www.pythian.com/news/1296/mysql-myini-gotcha-on-windows/#comments</comments>
		<pubDate>Tue, 14 Oct 2008 16:15:37 +0000</pubDate>
		<dc:creator>Augusto Bott</dc:creator>
				<category><![CDATA[MySQL]]></category>
		<category><![CDATA[escape sequence]]></category>
		<category><![CDATA[Microsoft Windows]]></category>
		<category><![CDATA[my.ini]]></category>
		<category><![CDATA[mysql gotchas]]></category>
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		<guid isPermaLink="false">http://www.pythian.com/blogs/1296/mysql-myini-gotcha-on-windows</guid>
		<description><![CDATA[The other day we began to encounter weird and random errors on small and innocent queries that shouldn&#8217;t give any errors at all. It all lead to one of our most basic health checks failing for no apparent reason. The first clue that popped into our minds was related to case-sensitivity, since the failing check [...]]]></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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