Oracle links

Tom Kyte
http://asktom.oracle.com
Cool 11g
Jonathan Lewis
http://www.jlcomp.demon.co.uk/
Guy Harrison
http://guyharrison.squarespace.com/
Cary Millsap
http://carymillsap.blogspot.com/
Tanel Poder
http://blog.tanelpoder.com/
Eric S. Emrick
http://esemrick.blogspot.com/2006/02/ora-000015-unique-constraint-not.html


Creating db from command line
http://www.adp-gmbh.ch/ora/admin/creatingdbmanually.html

SQL and PL/SQL forum
http://www.oracle-developer.net/

Others
http://toinevanbeckhoven.wordpress.com/
http://orana.info/category/dbd/
http://tech.e2sn.com/oracle/troubleshooting/how-to-read-errorstack-output
http://arjudba.blogspot.com/2008/08/how-to-restore-spfile-file-from.html

SQL Format
http://www.dpriver.com/pp/sqlformat.htm