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	<title>The Pythian Blog &#187; v$system_fix_control</title>
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		<title>Undocumented parameter _fix_control Or How to break your database</title>
		<link>http://www.pythian.com/news/1002/undocumented-parameter-_fix_control-or-how-to-break-your-database/</link>
		<comments>http://www.pythian.com/news/1002/undocumented-parameter-_fix_control-or-how-to-break-your-database/#comments</comments>
		<pubDate>Fri, 09 May 2008 16:56:39 +0000</pubDate>
		<dc:creator>Luke Davies</dc:creator>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[invalid ALTER]]></category>
		<category><![CDATA[ORA-00904]]></category>
		<category><![CDATA[ORA-904]]></category>
		<category><![CDATA[undocumented parameter]]></category>
		<category><![CDATA[v$session_fix_control]]></category>
		<category><![CDATA[v$system_fix_control]]></category>
		<category><![CDATA[_fix_control]]></category>

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		<description><![CDATA[Beware this parameter can prevent your database from starting. Indeed it can prevent your instance from starting! There are two dynamic views v$system_fix_control and v$session_fix_control which were introduced in 10.2 and control whether fixes for bugs in the optimizer can be turned on or off. This can also be controlled using the _fix_control initialization parameter. [...]]]></description>
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