Just a sample case about rebuilding the redo group

ORACLE_FileManage_Rebuild the redo group

Just a sample Case:

SQL>  select * from v$log;

    GROUP#   THREAD#  SEQUENCE#      BYTES   MEMBERS ARC STATUS          FIRST_CHANGE# FIRST_TIME

---------- -------------------- ---------- ---------- --- ---------------- ---------------------------

         1          1     39967   52428800          1 NO INACTIVE            3688205413 30-1-12

         2          1     39968   52428800          1 NO INACTIVE            3688311000 30-1-12

         3          1     39969   52428800          1 NO  CURRENT             3688413657 30-1-12

 

Solution:

1. NO-RAC

Case: SQL>  select * from v$log;     GROUP#    THREAD#  SEQUENCE#      BYTES     MEMBERS ARC STATUS            FIRST_CHANGE# FIRST_TIME ---------- ---------- ---------- ---------- ---------- ---  ---------------- ------------- --------------          1          1      39967    52428800          1 NO   INACTIVE            3688205413 30-1-12          2          1      39968    52428800          1 NO  INACTIVE            3688311000 30-1-12          3          1      39969    52428800          1 NO  CURRENT             3688413657 30-1-12 Solution: --- 1. Create a temp redo group 4 $ sqlplus '/as sysdba' SQL> ALTER DATABASE ADD LOGFILE GROUP 4  ('/opt/oracle/oradata/redotmp01.ora') SIZE 1000M; --- 2. Switch the logfile, make sure the group 4 is current SQL> alter system switch logfile; SQL> select * from v$log; --- 3. Drop the old redo groups SQL> alter database drop logfile group 1; SQL> alter database drop logfile group 2; SQL> alter database drop logfile group 3; --- 4. Create the new redo groups. (Must make sure the LV size are  enough.) SQL> ALTER DATABASE ADD LOGFILE GROUP 1 ('/dev/raw/raw10') SIZE  1000M; SQL> ALTER DATABASE ADD LOGFILE GROUP 2 ('/dev/raw/raw12') SIZE  1000M; SQL> ALTER DATABASE ADD LOGFILE GROUP 3 ('/dev/raw/raw14') SIZE  1000M; --- 5. Switch logfile and drop the group 4 SQL> set linesize 400 SQL> alter system switch logfile; SQL> alter database drop logfile group 4;

 

2. RAC

Solution: --- 1. Create a temp redo group 7 and group 8 $ sqlplus '/as sysdba' SQL> ALTER DATABASE ADD LOGFILE THREAD 1  GROUP 7 ('/opt/oracle/oradata/redotmp07.ora') SIZE 1000M; SQL> ALTER DATABASE ADD LOGFILE THREAD 2  GROUP 8 ('/opt/oracle/oradata/redotmp08.ora') SIZE 1000M; --- 2. Switch the logfile in the instance 1, make sure the group 7 is  current. Switch the logfile in the instance 2, make sure the group 8 is current. SQL> alter system switch logfile; SQL> select * from v$log; --- 3. Drop the old redo groups SQL> alter database drop logfile group 1; SQL> alter database drop logfile group 2; SQL> alter database drop logfile group 3; SQL> alter database drop logfile group 4; SQL> alter database drop logfile group 5; SQL> alter database drop logfile group 6; --- 4. Create the new redo groups. (Must make sure the LV size are  enough.) SQL> ALTER DATABASE ADD LOGFILE THREAD 1  GROUP 1 ('/dev/raw/raw10') SIZE 1000M; SQL> ALTER DATABASE ADD LOGFILE THREAD 1  GROUP 2 ('/dev/raw/raw12') SIZE 1000M; SQL> ALTER DATABASE ADD LOGFILE THREAD 1  GROUP 3 ('/dev/raw/raw14') SIZE 1000M; SQL> ALTER DATABASE ADD LOGFILE THREAD 2  GROUP 4 ('/dev/raw/raw15') SIZE 1000M; SQL> ALTER DATABASE ADD LOGFILE THREAD 2  GROUP 5 ('/dev/raw/raw16') SIZE 1000M; SQL> ALTER DATABASE ADD LOGFILE THREAD 2  GROUP 6 ('/dev/raw/raw17') SIZE 1000M; --- 5. Switch logfile and drop the group 7 and group 8 SQL> set linesize 400 SQL> alter system switch logfile; SQL> alter database drop logfile group 7; SQL> alter database drop logfile group 8;