Top 50 Critical ORA-/RMAN- Errors
Oracle 19c Database Top 50 Critical ORA-/RMAN- Errors Step-by-step diagnosis and resolution with command-line examples and output 12 October 2026 Outputs are representative samples (hostnames, SIDs, sizes illustrative). Test in non-production first; take a backup before any recovery or parameter change. Index of 50 Errors # Error Description Section 1 ORA-12541 TNS:no listener Connectivity 2 ORA-12154 TNS:could not resolve the connect identifier specified Connectivity 3 ORA-12514 TNS:listener does not currently know of service requested Connectivity 4 ORA-12170 TNS:Connect timeout occurred Connectivity 5 ORA-01017 / ORA-28000 Invalid username/password; account is locked Authentication 6 O...