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oerr <facility> <error>
The facility is the error prefix like "ORA", "PLS" etc. The error is the actual error number returned by Oracle. For example, if the database retured an ORA-12544 error, you can do the following oerr command to get more information about the error and possible action to take:
oracle@linux:/u001/oracle/product/9.2.0/bin% oerr ora 12544
12544, 00000, "TNS:contexts have different wait/test functions"
// *Cause: Two protocol adapters have conflicting wait/test functions.
// *Action: Not normally visible to the user. For further details, turn
// on tracing and reexecute the operation. If error persists, contact
// Oracle Customer Support.