ORA-01567: dropping log string would leave less than 2 log files for instance string (thread string)
Cause: Dropping all the logs specified would leave fewer than the required two log files per enabled thread.
Action: Either drop fewer logs or disable the thread before deleting the logs. It may be possible to clear the log rather than drop it.
ORA-01568
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ORA-01567dropping log string would leave less than 2 log files for instance string (thread string)