oracle 常用的几个网址

https://www.oracle.com/index.html

database
http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html
http://www.oracle.com/technetwork/database/enterprise-edition/documentation/index.html
https://docs.oracle.com/en/

sqldeveloper
http://www.oracle.com/technetwork/developer-tools/sql-developer/overview/index.html

oracle linux
https://www.oracle.com/linux/index.html
https://edelivery.oracle.com/osdc/faces/Home.jspx

oms、metalink
https://support.oracle.com