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	<title>EveryDay Practical Solutions for an Oracle&#124;SQL Server DBA &#187; TAF/Failover</title>
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	<link>http://www.oracledbasupport.co.uk</link>
	<description>This is my (Sagar PATIL ) blog to list day to day issues</description>
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		<title>FAN (Fast Application Notification) &amp; ONS (Oracle Notification Services)</title>
		<link>http://www.oracledbasupport.co.uk/fan-fast-application-notification-ons-oracle-notification-services/</link>
		<comments>http://www.oracledbasupport.co.uk/fan-fast-application-notification-ons-oracle-notification-services/#comments</comments>
		<pubDate>Wed, 05 Nov 2008 18:23:01 +0000</pubDate>
		<dc:creator>Sagar Patil</dc:creator>
				<category><![CDATA[RAC]]></category>
		<category><![CDATA[TAF/Failover]]></category>
		<category><![CDATA[conf]]></category>
		<category><![CDATA[database instances]]></category>
		<category><![CDATA[nodes]]></category>
		<category><![CDATA[ONS]]></category>
		<category><![CDATA[opmn]]></category>
		<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oracle Clusterware]]></category>
		<category><![CDATA[Oracle Notification Services]]></category>
		<category><![CDATA[Oracle Notification Services ONS]]></category>
		<category><![CDATA[Script]]></category>
		<category><![CDATA[STATE]]></category>
		<category><![CDATA[sumsky]]></category>

		<guid isPermaLink="false">http://www.oracledbasupport.co.uk/?p=149</guid>
		<description><![CDATA[Oracle Notification Services ONS allows users to send SMS messages, e-mails, voice notifications, and fax messages in an easy-to-access manner. Oracle Clusterware uses ONS to send notifications about the state of the database instances to midtier applications that use this information for load-balancing and for fast failure detection. ONS is a daemon process that communicates [...]]]></description>
		<wfw:commentRss>http://www.oracledbasupport.co.uk/fan-fast-application-notification-ons-oracle-notification-services/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>How does the failover mechanism work?</title>
		<link>http://www.oracledbasupport.co.uk/how-does-the-failover-mechanism-work/</link>
		<comments>http://www.oracledbasupport.co.uk/how-does-the-failover-mechanism-work/#comments</comments>
		<pubDate>Wed, 05 Nov 2008 18:22:52 +0000</pubDate>
		<dc:creator>Sagar Patil</dc:creator>
				<category><![CDATA[FAQ/Concepts]]></category>
		<category><![CDATA[RAC]]></category>
		<category><![CDATA[TAF/Failover]]></category>
		<category><![CDATA[cluster members]]></category>
		<category><![CDATA[cluster membership]]></category>
		<category><![CDATA[cluster services]]></category>
		<category><![CDATA[CSS]]></category>
		<category><![CDATA[failover]]></category>
		<category><![CDATA[member]]></category>
		<category><![CDATA[Membership]]></category>
		<category><![CDATA[node]]></category>
		<category><![CDATA[nodes]]></category>
		<category><![CDATA[work]]></category>

		<guid isPermaLink="false">http://www.oracledbasupport.co.uk/?p=150</guid>
		<description><![CDATA[RAC relies on the cluster services for failure detection. The cluster services are a distributed kernel component that monitors whether cluster members (nodes) can communicate with each other and, through this process,enforces the rules of cluster membership. In Oracle Database 10g, this function is performed by CSS, through the CSSD process. The functions performed by [...]]]></description>
		<wfw:commentRss>http://www.oracledbasupport.co.uk/how-does-the-failover-mechanism-work/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>TAF can be verified by querying the Oracle-provided views</title>
		<link>http://www.oracledbasupport.co.uk/taf-can-be-verified-by-querying-the-oracle-provided-views/</link>
		<comments>http://www.oracledbasupport.co.uk/taf-can-be-verified-by-querying-the-oracle-provided-views/#comments</comments>
		<pubDate>Wed, 05 Nov 2008 18:22:00 +0000</pubDate>
		<dc:creator>Sagar Patil</dc:creator>
				<category><![CDATA[FAQ/Concepts]]></category>
		<category><![CDATA[RAC]]></category>
		<category><![CDATA[TAF/Failover]]></category>
		<category><![CDATA[data]]></category>
		<category><![CDATA[data dictionary]]></category>
		<category><![CDATA[failover]]></category>
		<category><![CDATA[Implementation]]></category>
		<category><![CDATA[information]]></category>
		<category><![CDATA[NONE]]></category>
		<category><![CDATA[SID USERNAME]]></category>
		<category><![CDATA[TAF]]></category>
		<category><![CDATA[TAF implementation]]></category>

		<guid isPermaLink="false">http://www.oracledbasupport.co.uk/?p=151</guid>
		<description><![CDATA[Implementation of TAF can be verified by querying the Oracle-provided data dictionary views. V$SESSION has three columns, FAILOVER_MODE, FAILOVER_TYPE, and FAILED_OVER, that provide information pertaining to TAF implementation, and verification of results when the node in the cluster crashes and the session fails over to one of the available nodes. SELECT SID, USERNAME, FAILOVER_TYPE, FAILOVER_METHOD, [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>EM grid console active only at RAC 1 Instance</title>
		<link>http://www.oracledbasupport.co.uk/em-grid-console-active-only-at-rac-1-instance/</link>
		<comments>http://www.oracledbasupport.co.uk/em-grid-console-active-only-at-rac-1-instance/#comments</comments>
		<pubDate>Thu, 13 Mar 2008 17:23:39 +0000</pubDate>
		<dc:creator>Sagar Patil</dc:creator>
				<category><![CDATA[RAC]]></category>
		<category><![CDATA[TAF/Failover]]></category>
		<category><![CDATA[Database]]></category>
		<category><![CDATA[inst]]></category>
		<category><![CDATA[Online]]></category>
		<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oracle Corporation]]></category>
		<category><![CDATA[Oracle Enterprise Manager]]></category>
		<category><![CDATA[Resource Target State]]></category>
		<category><![CDATA[srv]]></category>
		<category><![CDATA[wygprod]]></category>

		<guid isPermaLink="false">http://www.oracledbasupport.co.uk/2008/03/13/em-grid-console-active-only-at-rac-1-instance/</guid>
		<description><![CDATA[Case 1 : EM console is working at Node 1. Node 1 is shutdown , services failover to Node 2 but oemctl doesn&#8217;t failover to Node 2 [oracle@wygora02 ~]$ showcrs HA Resource Target State ----------- ------ ----- ora.wygora01.ASM1.asm ONLINE OFFLINE ora.wygora01.LISTENER_WYGORA01.lsnr ONLINE OFFLINE ora.wygora01.gsd ONLINE OFFLINE ora.wygora01.ons ONLINE OFFLINE ora.wygora01.vip ONLINE OFFLINE ora.wygora02.ASM2.asm ONLINE ONLINE [...]]]></description>
		<wfw:commentRss>http://www.oracledbasupport.co.uk/em-grid-console-active-only-at-rac-1-instance/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Client side TNS Entry for Failover</title>
		<link>http://www.oracledbasupport.co.uk/client-side-tns-entry-for-failover/</link>
		<comments>http://www.oracledbasupport.co.uk/client-side-tns-entry-for-failover/#comments</comments>
		<pubDate>Thu, 13 Mar 2008 11:24:41 +0000</pubDate>
		<dc:creator>Sagar Patil</dc:creator>
				<category><![CDATA[RAC]]></category>
		<category><![CDATA[TAF/Failover]]></category>
		<category><![CDATA[DESCRIPTION]]></category>
		<category><![CDATA[failover]]></category>
		<category><![CDATA[NAME]]></category>
		<category><![CDATA[wygoravip]]></category>
		<category><![CDATA[wygprod]]></category>

		<guid isPermaLink="false">http://www.oracledbasupport.co.uk/2008/03/13/client-side-tns-entry-for-failover/</guid>
		<description><![CDATA[In an example below wygprod1,wygprod2 are 2 RAC instances while wygprod is a failover configuration. WYGPROD = (DESCRIPTION = (enable=broken) (LOAD_BALANCE = yes) (ADDRESS = (PROTOCOL = TCP)(HOST = wygoravip01.oracleconsultancy.net)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = wygoravip02.oracleconsultancy.net)(PORT = 1521)) (CONNECT_DATA = (SERVICE_NAME = wygprod) (failover_mode=(type=select)(method=basic)) ) ) WYGPROD1 = (DESCRIPTION = (ADDRESS = [...]]]></description>
		<wfw:commentRss>http://www.oracledbasupport.co.uk/client-side-tns-entry-for-failover/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>RAC/CRS/Voting disk failover Tests</title>
		<link>http://www.oracledbasupport.co.uk/rac-failure-scenerio/</link>
		<comments>http://www.oracledbasupport.co.uk/rac-failure-scenerio/#comments</comments>
		<pubDate>Tue, 04 Mar 2008 14:08:54 +0000</pubDate>
		<dc:creator>Sagar Patil</dc:creator>
				<category><![CDATA[RAC]]></category>
		<category><![CDATA[TAF/Failover]]></category>
		<category><![CDATA[ASM]]></category>
		<category><![CDATA[data]]></category>
		<category><![CDATA[disk]]></category>
		<category><![CDATA[loss]]></category>
		<category><![CDATA[Oracle Recovery Private Network Failure]]></category>
		<category><![CDATA[RMAN]]></category>

		<guid isPermaLink="false">http://www.oracledbasupport.co.uk/2008/03/04/rac-failure-scenerio/</guid>
		<description><![CDATA[Failure Scenario How to Test it? Oracle Recovery Private Network Failure between Nodes Pull PRIVATE port network cable out from RAC node 1 or 2 Oracle will push all connections from node1 to node 2 or vice versa. If an application is certified against RAC then unnoticeable to end users. Public Network Failure Pull PUBLIC [...]]]></description>
		<wfw:commentRss>http://www.oracledbasupport.co.uk/rac-failure-scenerio/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>How to recover from a Loss of Voting Disk</title>
		<link>http://www.oracledbasupport.co.uk/rac-asm-crash-scenario/</link>
		<comments>http://www.oracledbasupport.co.uk/rac-asm-crash-scenario/#comments</comments>
		<pubDate>Mon, 03 Mar 2008 18:36:00 +0000</pubDate>
		<dc:creator>Sagar Patil</dc:creator>
				<category><![CDATA[RAC]]></category>
		<category><![CDATA[TAF/Failover]]></category>
		<category><![CDATA[check]]></category>
		<category><![CDATA[dD]]></category>
		<category><![CDATA[INSTANCE]]></category>
		<category><![CDATA[loss]]></category>
		<category><![CDATA[reading]]></category>
		<category><![CDATA[Restart]]></category>
		<category><![CDATA[Voting Disk]]></category>

		<guid isPermaLink="false">http://www.oracledbasupport.co.uk/2008/03/03/rac-asm-crash-scenario/</guid>
		<description><![CDATA[Loss of Voting Disk Check where voting disks are located using &#8220;crsctl check crs&#8221; Backup of voting disk : dd if=/dev/raw/votingdisk of=/vmasmtest/BACKUP/VOTING/votingdisk_06_may_07 dd: reading `/dev/raw/votingdisk&#8217;: No such device or address 305172+0 records in 305172+0 records out [root@vmractest1 VOTING]# ls -l total 152744 -rw-r&#8211;r&#8211; 1 oracle dba 156248064 May 6 16:40 votingdisk_06_may_07 Delete voting disks using [...]]]></description>
		<wfw:commentRss>http://www.oracledbasupport.co.uk/rac-asm-crash-scenario/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>TAF Failover Configuration and Testing</title>
		<link>http://www.oracledbasupport.co.uk/rac-failover-configuration-testing/</link>
		<comments>http://www.oracledbasupport.co.uk/rac-failover-configuration-testing/#comments</comments>
		<pubDate>Tue, 26 Feb 2008 13:21:00 +0000</pubDate>
		<dc:creator>Sagar Patil</dc:creator>
				<category><![CDATA[RAC]]></category>
		<category><![CDATA[TAF/Failover]]></category>
		<category><![CDATA[col]]></category>
		<category><![CDATA[failover]]></category>
		<category><![CDATA[INSTANCE]]></category>
		<category><![CDATA[NAME]]></category>
		<category><![CDATA[SQL connections]]></category>
		<category><![CDATA[UNKNOWN]]></category>

		<guid isPermaLink="false">http://www.oracledbasupport.co.uk/2008/02/26/rac-failover-configuration-testing/</guid>
		<description><![CDATA[Configure the service on RAC servers for a failover TNS Client side config PROD = (DESCRIPTION = (enable=broken) (LOAD_BALANCE = yes) (ADDRESS = (PROTOCOL = TCP)(HOST = oravip01.oracledbasupport.com)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = oravip02.oracledbasupport.com)(PORT = 1521)) (CONNECT_DATA = (SERVICE_NAME = prod) (failover_mode=(type=select)(method=basic)) ) ) Let&#8217;s test a Failover &#8211; Connect to an [...]]]></description>
		<wfw:commentRss>http://www.oracledbasupport.co.uk/rac-failover-configuration-testing/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
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