SQL> shutdown immediate
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 285212672 bytes
Fixed Size 1218968 bytes
Variable Size 100664936 bytes
Database Buffers 176160768 bytes
Redo Buffers 7168000 bytes
Database mounted.
SQL> recover database until cancel;
Media recovery complete.
SQL> alter database open resetlogs; ---------resetlogs会把online redo清空做好全备份-----
Database altered.
SQL>
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