How to retrieve the database SYSTEM datafile get corrupted?

Database is in ARCHIVELOG mode, and the system tablespace data file is corrupt. Until when can I recover the database?

A. until the last commit.
(B) until the moment where you are recovering.
(C) until the moment when the data file has been corrupted.
D. you may not recover the SYSTEM tablespace and you must be re - create the database.


--
and 1 more doubt:

If redologfiles are not multiplexed and blocks redolog get damaged in Group 2, archiving stops and. All redolog files are filled and database activity is interrupted.
DBWR wrote everything on the drive. What command allows you to go further?

A. retrieve the block logfile Group 2;
B. change the database drop logfile Group 2;
C. change the database group claire logfile 2;
D. change the group database recover logfile 2;
E. change the database clear no archived lofile Group 2;

Published by: user642367 on September 18, 2008 20:45

1A. Because the DB is in archivelog mode, so you can always restore and recover the entire DB including system tablespace datafile to latter YVERT generated provided that redo record is available in in line/Archives log files.

2 E. Because only redolog corrupt archive so only proceed where a blockage of the db is obvious, then, in order to proceed further you must clear (a journal archived file) online and then db will work as usual. There you must take a full backkup of DB (cold backup insofar as possible) as soon as possible after the issuance of this order. Like now, you do not repeat information in the archivelog files to recover the db in case of crash.

Please go through Oracle 10 g DB Administrator's guide (available on OTN) for more details.

Thank you

Tags: Database

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