Kiran Dalvi21 Dec, 20230 Comments1 Min ReadORA-00350: Log 4 Of Instance Needs To Be Archived Problem : After restoring a RAC database to a standalone database through RMAN, we tried to drop the redo log groups belongs to thread 2. We got this error. Solution : Before dropping, we need to clear the redolog using below command. SQL> alter database clear unarchived logfile group 7; Database altered. Now try to drop again: SQL> alter database drop logfile group 7; Database altered. Oracle DBAShare: ORA-39142: Incompatible Version Number 4.1 in Dump File.ORA-00392: Log 7 Of Thread 1 Is Being Cleared, Operation Not Allowed