Troubleshooting | Oracle - Database

Issue / Error Message: ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
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Scenario: Database connection is failing. You either see this error in application log that is not starting because it is not able to connect to database OR you are using some tools/IDE to connect to database and see the above error

Cause: Either the database is not started or you are providing incorrect SID/service name details

Solution: Start the database or verify if SID/Service name is correct