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ALTER DATABASE ADD LOGFILE '/dbdata/oracle/logfile/redo01a.log' size 50M; //设置大小
alter database add logfile member '/dbdata/oracle/logfile/redo01a.log' to group 1;
SQL> startup
ORACLE instance started.
Total System Global Area 2471931904 bytes
Fixed Size 2255752 bytes
Variable Size 1040188536 bytes
Database Buffers 1409286144 bytes
Redo Buffers 20201472 bytes
Database mounted.
ORA-01113: file 5 needs media recovery
ORA-01110: data file 5: '/data/oracle/datafile/sunecm01.dbf'
SQL> recover datafile '/data/oracle/datafile/sunecm01.dbf'
ORA-01034: ORACLE not available
Process ID: 23279
Session ID: 1705 Serial number: 5
----------------重启服务器、释放进行------
SQL> conn / as sysdba
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 2471931904 bytes
Fixed Size 2255752 bytes
Variable Size 1040188536 bytes
Database Buffers 1409286144 bytes
Redo Buffers 20201472 bytes
Database mounted.
ORA-01113: file 5 needs media recovery
ORA-01110: data file 5: '/data/oracle/datafile/sunecm01.dbf'
SQL> recover datafile '/data/oracle/datafile/sunecm01.dbf' Media recovery complete. （编辑：李大同）
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