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ORA-messages
  ORA-15021
Common error messages
TNS connection closed
IO error writing block
Resource busy
Invalid character
Invalid datatype
Syntax error
Looping chain synonyms
Resolve connect identifier
number too large for buffer
ORA-01487
ORA-04031
ORA-12545
ORA-06550
ORA-01650
All error messages
  OraDev.com
ORA-15021: parameter "string" is not valid in string instance
Cause: The specified parameter was not supported when starting an instance of this type.
Action: Delete the specified parameter from the INIT.ORA file.