Oracle General

http://www.kods.net/dba-skills-needed/
http://www.articles.freemegazone.com/oracle_CBO.php

https://updates.oracle.com/Orion/SimpleSearch/process_form?search_type=patch&patch_number=3283405&plat_lang=48P&display_type=&search_style=8&orderby=3&direction=d&old_type_list=&gobuttonpressed=&sortcolpressed=&tab_number=&c_release_parent=product&c_product_child=release

Oarcle Backup & Restore

http://oracledba.ezpowell.com/oracle/BackupAndRecovery.html
http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/backrec.htm
http://tamimdba.wordpress.com/2010/01/02/how-to-backup-and-restore-the-oracle-control-file/
http://download.oracle.com/docs/cd/E13789_01/bh.100/e13797/backuprecover.htm

Export Import:
http://www-it.desy.de/systems/services/databases/oracle/impexp/impexp.html.en

RMAN:

http://www.dbasupport.com/oracle/ora10g/backup_guide01.shtml

Oracle Patching Step by Step

http://www.articles.freemegazone.com/oracle-patching-secrets.php?ref=2
http://wiki.oracle.com/page/Patching+Hints+and+Tips
http://wiki.sdn.sap.com/wiki/display/HOME/Oracle++Patch+Install

Oracle RMAN backup

http://kr.forums.oracle.com/forums/thread.jspa?threadID=1091499&tstart=240
http://www.oracle-base.com/articles/10g/RMANEnhancements10g.php
http://www.stanford.edu/dept/itss/docs/oracle/10g/server.101/b10734/osbackup.htm
http://sqltech.cl/doc/oas10gR3/core.1013/b25209/br_intro.htm

Oracle Replication

http://www.akadia.com/services/ora_replication_guide.html

oracle EM Console

http://oradbapro.blogspot.com/2009/03/oracle-em-console-10g.html

Oracle Performance Tuning

http://www.oracle-base.com/articles/10g/SpaceObjectTransactionManagement10g.php#segment_advisor
http://www.orafaq.com/forum/mv/msg/84315/246965/136607/#msg_246965
http://www.orafaq.com/faq/performance_tuning

http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/toc.htm

http://www.orafaq.com/wiki/Category:Performance_Tuning

Oracle Patching

http://www.iselfschooling.com/mc4articles/mc4orapatch.htm
http://searchoracle.techtarget.com/tip/How-to-apply-an-Oracle-patch
http://www.akadia.com/services/ora_silent_install.html