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	<title>AskDba.org Weblog &#187; corruption</title>
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	<description>Writing About Our Experiences With Oracle Databases</description>
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		<title>Recovering from ORA-1578 ORA-8103 (Logical Corruption)</title>
		<link>http://askdba.org/weblog/2008/05/ora-1578-ora-8103-corruption/</link>
		<comments>http://askdba.org/weblog/2008/05/ora-1578-ora-8103-corruption/#comments</comments>
		<pubDate>Wed, 21 May 2008 19:07:07 +0000</pubDate>
		<dc:creator>Saurabh Sood</dc:creator>
				<category><![CDATA[database]]></category>
		<category><![CDATA[oracle]]></category>
		<category><![CDATA[corruption]]></category>

		<guid isPermaLink="false">http://askoracledba.wordpress.com/?p=39</guid>
		<description><![CDATA[1. For ORA-1578: There are two ways in which we can extract the data from a corrupted table: a) Using DBMS_REPAIR.SKIP_CORRUPT_BLOCKS b) Using Event 10231 a) Connect as sysdba user: execute DBMS_REPAIR.SKIP_CORRUPT_BLOCKS(&#8216;&#60;schema_name&#62;&#8217;,'&#60;table_name&#62;&#8217;); Put the schema name and the table name of the corrupted table. Then issue the following command to craete a new table from [...]]]></description>
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		<title>Physical Corruption: ORA-1578 PART-2</title>
		<link>http://askdba.org/weblog/2008/05/physical-corruption-ora-1578-part-2/</link>
		<comments>http://askdba.org/weblog/2008/05/physical-corruption-ora-1578-part-2/#comments</comments>
		<pubDate>Sat, 03 May 2008 07:47:00 +0000</pubDate>
		<dc:creator>Saurabh Sood</dc:creator>
				<category><![CDATA[database]]></category>
		<category><![CDATA[oracle]]></category>
		<category><![CDATA[corruption]]></category>

		<guid isPermaLink="false">http://askoracledba.wordpress.com/2008/05/03/physical-corruption-ora-1578-part-2/</guid>
		<description><![CDATA[Recovering from physical corruption: 1. Using BMR when RMAN backups are available When small set of blocks are corrupted, Block Media Recovery (BMR) can be used as a recovery technique. The advantage of BMR is that it can be performed without taking the datafiles offline but the block undergoing BMR is not accessible to users. [...]]]></description>
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		<title>Physical Corruption: ORA-1578 -Part 1</title>
		<link>http://askdba.org/weblog/2008/04/physical-corruption-ora-1578-part-1/</link>
		<comments>http://askdba.org/weblog/2008/04/physical-corruption-ora-1578-part-1/#comments</comments>
		<pubDate>Sun, 27 Apr 2008 04:26:00 +0000</pubDate>
		<dc:creator>Saurabh Sood</dc:creator>
				<category><![CDATA[database]]></category>
		<category><![CDATA[oracle]]></category>
		<category><![CDATA[corruption]]></category>

		<guid isPermaLink="false">http://askoracledba.wordpress.com/2008/04/27/physical-corruption-ora-1578-part-1/</guid>
		<description><![CDATA[ORA-1578 is indication of physical block corruption. Oracle computes an internal checksum before fetching the block from disk, when it is about to fetch the block it reads the block header and compare the checksum stored in it. If the checksum mismatches we get ora-1578 error.It indicates that a block is corrupted at hardware level [...]]]></description>
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