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I am getting the "ORA-03113" error on SCO Unix Version 5.0, running Oracle version 7.3.4. I don't have any issue with tnsping, but sometimes when I try to log in to SQL*Plus, I get this error. I check the listener.ora and other files, but this problem is really causing me big trouble.
The ORA-3113 error simply means that your network connection to the database was severed. First, make sure that you are not having any network problems. If you can reproduce the ORA-3113 error at will, for example, by running the same application or SQL statement to produce this error, then it is likely that you are experiencing a bug. The 7.3.4 version is quite old, and many ORA-3113 errors have been fixed over the years.