Instalacion oracle 11 XE

http://www.notodocodigo.com/sin-categoria/cambiar-puerto-1521-en-oraclexe/
http://blog-juanzgz82.rhcloud.com/primeros-pasos-con-oracle-xe-y-sql-developer/
http://www.notodocodigo.com/sin-categoria/cambiar-puerto-1521-en-oraclexe/  
https://www.youtube.com/watch?v=JNiD2ZFoWN4
https://docs.oracle.com/cd/E17781_01/admin.112/e18585/toc.htm#XEGSG121 
http://gtbasededatos.blogspot.com.es/2013/05/como-desbloquear-el-schema-hr-en-oracle.html
http://www.haciendoti.com/sha-2-hash-algorithms-in-oracle/