New Oracle articles

Few new oracle articles I write for system administrators
http://it.toolbox.com/blogs/unix-swing/oracle-db-for-system-administrators-37333
http://it.toolbox.com/blogs/unix-swing/oracle-db-for-system-administrators-part2-37403
http://it.toolbox.com/blogs/unix-swing/oracle-db-for-system-administrators-part3-37452