（579）You have lost all your online redo logs. As a result,your database has crashed.

You have tried to restart the database and clear the online redo log files, but when you try to open the database you get the following error.

SQL>startup ORACLE instance started.

Total System Global Area 167395328 bytes

Fixed Size 1298612 bytes

Variable Size 142610252 bytes

Database Buffers 20971520 bytes

Redo Buffers 2514944 bytes

Database mounted.

ORA-00313:open failed for members of log group 2 of thread 1

ORA-00312:online log 2 thread 1: '/oracle01/oradata/orcl/redo02a.log'

ORA-27037:unable to obtain file status

Linux Error:2:No such file or directory

Additional information:3

ORA-00312:online log 2 thread 1: '/oracle01/oradata/orcl/redo02.log'

ORA-27037:unable to obtain file status

Linux Error:2:No such file or directory Additional information:3

SQL>alter database clear logfile group 2;

alter database clear logfile group 2*ERROR at line 1:

ORA-01624:log 2 needed for crash recovery of instance orcl(thread 1)

ORA-00312:online log 2 thread 1: '/oracle01/oradata/orcl/redo02.log'

ORA-00312:online log 2 thread 1: '/oracle01/oradata/orcl/redo02a.log'

What steps must you take to resolve the error?

a. Issue the recover database redo logs command.

b. Issue the Startup Mount command to mount the database.

c. Restore the last full database backup.

d. Perform a point-in-time recovery,applying all archived redo logs that are available.

e. Restore all archived redo logs generated during and after the last full database backup.

f. Open the database using the alter database open resetlogs command.

g. Issue the alter database open command.

A. b,a,f

B. e,b,a,f

C. e,b,a,g

D. b,a,g

E. c,e,b,d,f

答案：（E）

解析：

ORA-01624:log string needed for crash recovery of instance string(thread string)

Cause:A log cannot be dropped or cleared until the thread's checkpoint has advanced out of the log.

Action:If the database is not open,then open it.Crash recovery will advance the checkpoint.

If the database is open force a global checkpoint.

If the log is corrupted so that the database cannot be opened,it may be necessary to do incomplete recovery until cancel at this log.

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Oracle 11G OCP 1Z0-053 579