Restore & Recover SYSAUX datafile while DB up

Question

Hi,
Due to data block corruption of SYSAUX, need to keep it offline then recover and make it online.
sql 'alter database datafile 2 offline';
restore datafile 2;
recover datafile 2;
sql 'alter database datafile 2 online';
Is it possible to do this operation while Database is up? or we need to keep it down?
BANNER
Oracle Database 11g Release 11.1.0.6.0 - 64bit Production
PL/SQL Release 11.1.0.6.0 - Production
CORE 11.1.0.6.0 Production
TNS for Linux: Version 11.1.0.6.0 - Production
NLSRTL Version 11.1.0.6.0 - Production
Thanks
Edited by: Nadvi on Jun 10, 2010 10:02 PM
Edited by: Nadvi on Jun 10, 2010 10:28 PM

Answer 1

Nadvi wrote:
Hi,
Due to data block corruption of SYSAUX, need to keep it offline then recover and make it online.
sql 'alter database datafile 2 offline';
restore datafile 2;
recover datafile 2;
sql 'alter database datafile 2 online';
Is it possible to do this operation while Database is up? or we need to keep it down?
BANNER
Oracle Database 11g Release 11.1.0.6.0 - 64bit Production
PL/SQL Release 11.1.0.6.0 - Production
CORE 11.1.0.6.0 Production
TNS for Linux: Version 11.1.0.6.0 - Production
NLSRTL Version 11.1.0.6.0 - Production
ThanksDear Nadvi
Why you don't perform Block Media Recovery on the corrupted data blocks using RMAN?
In the following example I show how you can recover corrupted data block in the SYSAUX tablespace. However, as you use Oracle 11g, you will use the following syntax:
RECOVER DATAFILE datafile_no BLOCK block)no Here's the example:
SQL> create user test identified by test;
User created.
SQL> grant dba to test;
Grant succeeded.
SQL> conn test/test
Connected.
SQL> create table tbl_test (name varchar2(10)) tablespace sysaux;
Table created.
SQL> insert into tbl_test values('test');
1 row created.
SQL> commit;
Commit complete.
SQL> SELECT header_block FROM dba_segments WHERE segment_name='TBL_TEST';
HEADER_BLOCK
        2939
SQL> select tablespace_name from dba_segments where segment_name='TBL_TEST';
TABLESPACE_NAME
SYSAUX
RMAN> backup database plus archivelog delete input;
[oracle@localhost ~]$ dd of=/u01/oracle/product/10.2.0/db_1/oradata/db1/sysaux01.dbf bs=8192 conv=notrunc seek=2939 <<EOF
corruption
EOF0+1 records in
0+1 records out
11 bytes (11 B) copied, 0.0182719 seconds, 0.6 kB/s
SQL> alter system flush buffer_cache;
System altered.
SQL> conn test/test
Connected.
SQL> select * from tbl_test;
select * from tbl_test
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 3, block # 2939)
ORA-01110: data file 3:
'/u01/oracle/product/10.2.0/db_1/oradata/db1/sysaux01.dbf'
RMAN> blockrecover datafile 3 block 2939;
starting media recovery
media recovery complete, elapsed time: 00:00:07
Finished blockrecover at 10-JUN-10
RMAN> exit
SQL> conn test/test
Connected.
SQL> select * from tbl_test;
NAME
testFor more information on Block Media Recovery, you can watch my Video Tutorial
http://kamranagayev.wordpress.com/2010/03/18/rman-video-tutorial-series-performing-block-media-recovery-with-rman/