Recover from datafile block corruption leveraging physical standby

Here are the steps I used to recover my primary database by leveraging a Dataguard environment.

## on standby

1. stop managed recovery on standby.

SQL> alter database recover managed standby database cancel;

2. Backup as a copy of the datafile from standby.

RMAN> backup as copy datafile 2 format '/app/oracle/temp/sysaux_01.dbf';

3. SCP the backup copy of the datafile to the primary database server.

scp /app/oracle/temp/sysaux_01.dbf <target_server>:/app/oracle/temp


## on primary

4. Take corrupt datafile offline.

SQL> alter database datafile 2 offline;

5. Catalog datafile to the primary database so the controlfile knows about it.

RMAN> catalog datafilecopy '/app/oracle/temp/sysaux_01.dbf';

6. Restore and recover the datafile in question.

RMAN> restore datafile 2;

 RMAN> recover datafile 2;

7. Bring the datafile back online.

SQL> alter database datafile 2 online;

8. Validate that the corruption is no longer present.

RMAN> validate check logical datafile 2;

 SQL> select * from v$database_block_corruption;

Comments

Post a Comment

Popular posts from this blog

RMAN-10038: database session for channel prm3 terminated unexpectedly

Problem: I had an issue where I was trying to build a 1.7 TB Data Guard environment and kept receiving the highlighted error below.  I thought it was some type of fluke so I restarted the job 2 more times only to receive the same error. Fix: After researching the issue, I found it was because the sqlnet.ora needed to be configured correctly.  I added the entry " SQLNET.EXPIRE_TIME = 10 " to the sqlnet.ora on both the source and the target database servers under the RDBMS $ORACLE_HOME/network/admin.  Upon restarting the RMAN active database standby build, it was able to move past this error and built successfully. Starting backup at 07-MAY-17 channel prm1: starting datafile copy input datafile file number=00003 name=+DATA/testdb/datafile/undotbs1.262.940412881 channel prm2: starting datafile copy input datafile file number=00129 name=+DATA/testdb/datafile/welldoc1.390.940509955 channel prm3: starting datafile copy input datafile file number=00130 name=+DATA/test
Read more

ORA-17630: Mismatch in the remote file protocol version client 2 server 3

I was trying to create an Oracle Data Guard environment (physical standby) from an Oracle database running version 12.1.0.2. The database was running an older PSU version ("Database Patch Set Update : 12.1.0.2.161018 (24006101)") to be specific. Upon trying to build the standby by using RMAN DUPLICATE with ACTIVE DATABASE, I ran into the below error: executing Memory Script Starting backup at 16-JUL-18 RMAN-03009: failure of backup command on prm1 channel at 07/16/2018 13:51:46 ORA-17629: Cannot connect to the remote database server ORA-17630: Mismatch in the remote file protocol version client 2 server 3 continuing other job steps, job failed will not be re-run released channel: prm1 released channel: prm2 released channel: prm3 released channel: prm4 released channel: prm5 released channel: stb1 RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: ====================
Read more

ORA-00338: log {n} of thread {n} is more recent than control file

I received the following error in a primary database's alert log that I was supporting recently.   ORA-00312: online log 5 thread 1: '+DATA/db_name/onlinelog/group_5.297.846947859' ORA-00338: log 5 of thread 1 is more recent than control file The database has a DataGuard environment as well and below are the steps that I took to resolve the issue. 1.  First, I checked the status of the redo logs and their current sizes and status. SQL> select group#,bytes/1024/1024,status from v$log;     GROUP# BYTES/1024/1024 STATUS ---------- --------------- ----------------          1              50 INACTIVE          2              50 INACTIVE          3              50 INACTIVE          4             250 INACTIVE          5             250 INACTIVE          6             250 CURRENT 2.  As you can see, groups 1, 2, 3 have 50 MB redo log group sizes while group 4, 5, 6 are 250 MB redo log group sizes.  This is something that I highly suspect was/is the issue.  So I
Read more