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ORA-01102: cannot mount database in exclusive

is often due to one of the following reasons: – there is still an “sgadef.dbf” file in the “ORACLE_HOME/dbs” directory – the processes for Oracle (pmon, smon, lgwr and dbwr) still exist – shared memory segments and semaphores still exist even though the database has been shutdown – there is a “ORACLE_HOME/dbs/lk” file

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