Oracle DB 11g Errors Guide
This application helps you as a developer or administrator of Oracle ® Database 11g Release 1 find solutions of problems which you are faced with during your work. Each error message contains the message statement, an explanation of the probable causes and a recommended action.
More information about Oracle ® Database 11g Release 1 Error Messages you can find under hyperlink - http://docs.oracle.com/cd/B28359_01/server.111/b28278/toc.htm