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Some of the common Oracle error codes

ORA-12500: TNS:listener failed to start a dedicated server process
ORA-12541: TNS:no listener
ORA-12514: TNS:listener does not currently know of service requested
ORA-12154: TNS:could not resolve service name
ORA-12535: TNS:operation timed out
ORA-01017: invalid username/password; logon denied

Latest changes or additions to Oracle Error Codes:

ORA-2289: Sequence does not exist
ORA-1045: user %s lacks CREATE SESSION privilege; logon denied
ORA-1017: invalid username/password; logon denied
ORA-933: SQL command not properly ended
ORA-904: Invalid identifier
ORA-17447: OALL8 is in an inconsistent state
ORA-24315: illegal attribute type
ORA-2055: distributed update operation failed; rollback required
ORA-2067: transaction or savepoint rollback required
ORA-202: control file: '%s'

Latest Forum questions:

ORA-24909: Re: dba
ORA-17447: dsc vdfdsd
ORA-1653: Remove the error
ORA-12560: Re:oracle 9i
ORA-1017: How to access oracle10g tables from one client to another client in LAN?
ORA-24909: dba
ORA-2201: ORA-02201: sequence not allowed here
ORA-1: Re: error
ORA-1033: z
ORA-1: error
ORA-1017: Re: Error Ora - 01017
ORA-1017: Error Ora - 01017
ORA-1017: Error Ora - 01017
ORA-20250: Re: ORA-20250:This record cannot be saved
ORA-20250: ORA-20250:This record cannot be saved
ORA-20250: ORA-20250:This record cannot be saved
ORA-1427: Re: Error ORA-01427: single-row subquery returns more than one row
ORA-4068: Re: not understanding why this will not compute
ORA-4068: not understanding why this will not compute
ORA-1427: Error ORA-01427: single-row subquery returns more than one row