Oracle Database Documentation (9i 10g 11gR1 11gR2)

Oracle Database 9i Documentation：

http://www.oracle.com/pls/db92/homepage

Oracle Database 10g Documentation：

http://www.oracle.com/pls/db102/homepage

Oracle Database 11g R1 Documentation：

http://www.oracle.com/pls/db111/homepage

Oracle Database 11g R2 Documentation：

http://www.oracle.com/pls/db112/homepage

下载地址：

11g:

http://www.oracle.com/technetwork/database/enterprise-edition/documentation/database-093888.html

10g:

http://www.oracle.com/technetwork/database/database10g/documentation/database10gr2-087366.html

官方的东西是最好的。