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Oracle® Database 11g / 12c / 18c error codes ORA-00024: logins from more than one process not allowed in single-process mode
ORA-00024: logins from more than one process not allowed in single-process mode
Oracle Error Code: ORA-00024
Cause: Trying to login more than once from different processes for ORACLE started in single-process mode.
Action: Logoff from the other process.