Oracle官方文档库

http://www.oracle.com/technetwork/cn/indexes/documentation/index.html

oracle 10g
http://www.oracle.com/technetwork/cn/database/database10g/documentation/database10gr2-100822-zhs.html

在线文档
http://www.oracle.com/pls/db102/homepage  10g 2

http://www.oracle.com/pls/db112/homepage  11g 2