http://techonthenet.com/oracle
http://www.ss64.com/oraplsql/
http://www.orafaq.com/
http://www.csee.umbc.edu/help/oracle8/server.815/a67842/06_errs.htm
http://www.dbaclick.com/forums/index.php?s=9a4559b30a7496d4bf96840ca2f0dda7
还有一个就是
dbforums.com
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