Error : "ORA-12505: TNS:listener does not currently know of SID given in connect descriptor" during installation of Performance Analysis repository database
The repository database instance name is different from its service name.
Performance Analysis looks for the instance name, so if the service name is supplied instead, the error will persists.
Supply the instance name instead. To know what is the instance name of the database, look into the init<sid>.ora file, or go to TOAD's Database | Administer | Oracle Parameters