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1 . set database to archivelog mode
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SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 251658240 bytes
Fixed Size 1248356 bytes
Variable Size 83887004 bytes
Database Buffers 159383552 bytes
Redo Buffers 7139328 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> alter database open;
Database altered.
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 1319
Next log sequence to archive 1321
Current log sequence 13
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