Usefull Blogs

http://emrebaransel.blogspot.com/2010/08/dataguard-cascade-standby-database.html
http://brettschroeder.blogspot.com/
http://gavinsoorma.com
http://uhesse.wordpress.com/2009/08/19/connect-time-failover-transparent-application-failover-for-data-guard/
http://muneer2908.wordpress.com/2011/01/04/oracle-apps-cloning-refreshing-single-instance-test-database-with-rac-production-data/
http://avdeo.com/2010/11/01/oracle-real-application-cluster-10g/
http://javeedkaleem.blogspot.com/
http://rajeysh.blogspot.com
http://nandakumarappsdba.blogspot.com
http://oraclespin.wordpress.com
http://blog.flimatech.com
Rac related
http://dbaregistry.blogspot.com/2010/02/oracle-rac-interview-questions.html
http://apunhiran.blogspot.com/2009/04/what-is-voting-disk-split-brain.html
http://rafioracledba.blogspot.com/search/label/INTERVIEWS
http://www.onlinedbasupport.com/Administration/244-CHANGING-DATABASE-NAME-USING-DBNEWID.html

Discussion about RAC
http://kevinclosson.wordpress.com/

Mr. Julian Dyke wrote couple of good articles on RAC. It can be
downloaded from his site.

http://www.juliandyke.com/


Set oracle rac in solaris
http://blog.bensmann.com/setup-solaris-for-oracle-rac

11gr2 Rac installations-
http://www.freeoraclehelp.com/2011/12/scan-setup-for-oracle-11g-release211gr2.html

Oracle Golden Gate:-
http://sai-oracle.blogspot.com/2010/09/what-is-oracle-goldengate.html
http://arundaskalathil.blogspot.com/2011/06/goldengate-active-activebidirectional.html
Video Tutorials:-
http://kamranagayev.wordpress.com/oracle-video-tutorials/

Solaris iscsi targets
http://sys-admin.wikidot.com/iscsi-solaris

video tutorials
http://www.brainsurface.com/tubesurface/viewvideo/24/real-application-clusters-rac/oracle-11g-racathon-session1-part1