To convert RAC to Non-RAC DB on normal file system we need to first convert it into ASM storage

Converting RAC db to Non-RAC db

In this article we will see conversion database from ASM to Normal File System :

Step 1 : Check details of ASM database and create pfile from spfile :

[oracle@rac1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Fri Mar 23 22:52:52 2018

Copyright (c) 1982, 2013, Oracle. All rights reserved.
[oracle@rac1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Fri Mar 23 22:52:52 2018

Copyright (c) 1982, 2013, Oracle. All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options

SQL> select name from v$database;

NAME
---------
TEST

SQL>
SQL>
SQL> select name from v$datafile;

NAME
--------------------------------------------------------------------------------
+DATA/test/datafile/system.311.970676549
+DATA/test/datafile/sysaux.310.970676581
+DATA/test/datafile/undotbs1.319.970676607
+DATA/test/datafile/users.320.970676613

SQL> show parameter spfile

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
spfile string +DATA/spfiletest.ora
SQL> create pfile from spfile;

File created.

SQL>
SQL>
SQL> shut immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL>

Step 2 : Change control_file parameter to destination you want on your normal FS.

Step 3 : Create spfile from pfile and start database in nomount stage :

[oracle@rac1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Fri Mar 23 23:30:25 2018

Copyright (c) 1982, 2013, Oracle. All rights reserved.

Connected to an idle instance.

SQL> create spfile from pfile;

File created.

SQL> startup nomount
ORACLE instance started.

Total System Global Area 392495104 bytes
Fixed Size 2253584 bytes
Variable Size 188746992 bytes
Database Buffers 197132288 bytes
Redo Buffers 4362240 bytes
SQL> show parameter control_files

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
control_files string /u01/app/oracle/oradata/test/c
ontrol01.ctl, /u01/app/oracle/
oradata/test/control02.ctl
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options

Here we can see control_file parameter is changed to normal FS destination.

Step 4 : connect to RMAN and restore controlfile from controlfile located at ASM storage.

[oracle@rac1 ~]$ rman target /

Recovery Manager: Release 11.2.0.4.0 - Production on Fri Mar 23 23:31:22 2018

Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.

connected to target database: TEST (not mounted)

RMAN> restore controlfile from '+DATA/test/controlfile/current.323.970676681';

Starting restore at 23-MAR-18
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=25 device type=DISK

channel ORA_DISK_1: copied control file copy
output file name=/u01/app/oracle/oradata/test/control01.ctl
output file name=/u01/app/oracle/oradata/test/control02.ctl
Finished restore at 23-MAR-18

Step 5 : Alter database to mount stage :

RMAN> alter database mount;

database mounted
released channel: ORA_DISK_1

Step 5 : Take RMAN database backup as copy backup :

RMAN> backup as copy database format '/u01/app/oracle/oradata/test/%U.dbf';

Starting backup at 23-MAR-18
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=25 device type=DISK
channel ORA_DISK_1: starting datafile copy
input datafile file number=00001 name=+DATA/test/datafile/system.311.970676549
output file name=/u01/app/oracle/oradata/test/data_D-TEST_I-2268489675_TS-SYSTEM_FNO-1_0csuhr9a.dbf tag=TAG20180323T233258 RECID=9 STAMP=971566421
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:45
channel ORA_DISK_1: starting datafile copy
input datafile file number=00002 name=+DATA/test/datafile/sysaux.310.970676581
output file name=/u01/app/oracle/oradata/test/data_D-TEST_I-2268489675_TS-SYSAUX_FNO-2_0dsuhrao.dbf tag=TAG20180323T233258 RECID=10 STAMP=971566465
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:45
channel ORA_DISK_1: starting datafile copy
input datafile file number=00003 name=+DATA/test/datafile/undotbs1.319.970676607
output file name=/u01/app/oracle/oradata/test/data_D-TEST_I-2268489675_TS-UNDOTBS1_FNO-3_0esuhrc6.dbf tag=TAG20180323T233258 RECID=11 STAMP=971566474
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07
channel ORA_DISK_1: starting datafile copy
input datafile file number=00004 name=+DATA/test/datafile/users.320.970676613
output file name=/u01/app/oracle/oradata/test/data_D-TEST_I-2268489675_TS-USERS_FNO-4_0fsuhrcd.dbf tag=TAG20180323T233258 RECID=12 STAMP=971566477
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:01
Finished backup at 23-MAR-18

Starting Control File and SPFILE Autobackup at 23-MAR-18
piece handle=+DATA/test/autobackup/2018_03_23/s_971565717.329.971566481 comment=NONE
Finished Control File and SPFILE Autobackup at 23-MAR-18

RMAN>
RMAN>

Step 6 : With RMAN session switch database to copy backup we have taken.

RMAN> switch database to copy;

datafile 1 switched to datafile copy "/u01/app/oracle/oradata/test/data_D-TEST_I-2268489675_TS-SYSTEM_FNO-1_0csuhr9a.dbf"
datafile 2 switched to datafile copy "/u01/app/oracle/oradata/test/data_D-TEST_I-2268489675_TS-SYSAUX_FNO-2_0dsuhrao.dbf"
datafile 3 switched to datafile copy "/u01/app/oracle/oradata/test/data_D-TEST_I-2268489675_TS-UNDOTBS1_FNO-3_0esuhrc6.dbf"
datafile 4 switched to datafile copy "/u01/app/oracle/oradata/test/data_D-TEST_I-2268489675_TS-USERS_FNO-4_0fsuhrcd.dbf"

RMAN>

Step 7 : Set newname for tempfile using following script :

RMAN> run {
2> set newname for tempfile 1 to '/u01/app/oracle/oradata/test/tempfile';
3> switch tempfile all;
4> }

executing command: SET NEWNAME

RMAN>

Step 8 : Open database from sqlplus session :

[oracle@rac1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Fri Mar 23 23:39:07 2018

Copyright (c) 1982, 2013, Oracle. All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options

SQL> select name,open_mode from v$database;

NAME OPEN_MODE
--------- --------------------
TEST MOUNTED

SQL> alter database open;

Database altered.

SQL>

Now , lets work on redo logfiles :

Step 9 : Add redo logs to new destination :

SQL> set lines 1000
SQL> select * from v$logfile;

GROUP# STATUS TYPE MEMBER IS_
---------- ------- ------- --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ---
1 ONLINE +DATA/test/onlinelog/group_1.331.970676801 NO
1 ONLINE +DATA/test/onlinelog/group_1.332.970676801 YES
2 ONLINE +DATA/test/onlinelog/group_2.333.970676803 NO
2 ONLINE +DATA/test/onlinelog/group_2.334.970676803 YES
3 ONLINE +DATA/test/onlinelog/group_3.335.970676805 NO
3 ONLINE +DATA/test/onlinelog/group_3.336.970676805 YES

6 rows selected.
SQL> alter database add logfile group 4 '/u01/app/oracle/oradata/test/redo04.log' size 250m;

Database altered.

SQL> alter database add logfile group 5 '/u01/app/oracle/oradata/test/redo05.log' size 250m;

Database altered.

SQL> alter database add logfile group 6 '/u01/app/oracle/oradata/test/redo06.log' size 250m;

Database altered.

SQL> select * from v$logfile;

GROUP# STATUS TYPE MEMBER IS_
---------- ------- ------- --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ---
1 ONLINE +DATA/test/onlinelog/group_1.331.970676801 NO
1 ONLINE +DATA/test/onlinelog/group_1.332.970676801 YES
2 ONLINE +DATA/test/onlinelog/group_2.333.970676803 NO
4 ONLINE /u01/app/oracle/oradata/test/redo04.log NO
5 ONLINE /u01/app/oracle/oradata/test/redo05.log NO
6 ONLINE /u01/app/oracle/oradata/test/redo06.log NO
2 ONLINE +DATA/test/onlinelog/group_2.334.970676803 YES
3 ONLINE +DATA/test/onlinelog/group_3.335.970676805 NO
3 ONLINE +DATA/test/onlinelog/group_3.336.970676805 YES

9 rows selected.

Step 10 : Check status of Redo logs if it is not in current status drop it .

SQL> select * from v$log;

GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME
---------- ---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- --------- ------------ ---------
1 1 44 52428800 512 2 YES INACTIVE 1663747 22-MAR-18 1689826 23-MAR-18
2 1 45 52428800 512 2 NO CURRENT 1689826 23-MAR-18 2.8147E+14
3 1 43 52428800 512 2 YES INACTIVE 1663666 22-MAR-18 1663747 22-MAR-18
4 1 0 262144000 512 1 YES UNUSED 0 0
5 1 0 262144000 512 1 YES UNUSED 0 0
6 1 0 262144000 512 1 YES UNUSED 0 0

6 rows selected.

SQL> alter database drop logfile group 1;

Database altered.

SQL> alter database drop logfile group 3;

Database altered.

SQL> select * from v$log;

GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME
---------- ---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- --------- ------------ ---------
2 1 45 52428800 512 2 NO CURRENT 1689826 23-MAR-18 2.8147E+14
4 1 0 262144000 512 1 YES UNUSED 0 0
5 1 0 262144000 512 1 YES UNUSED 0 0
6 1 0 262144000 512 1 YES UNUSED 0 0

Step 11 : We can see here group 2 is in current status , so we need to do checkpointing and archiving process.

SQL> alter system checkpoint;

System altered.

SQL> alter system switch logfile;

System altered.

SQL> select * from v$log;

GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME
---------- ---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- --------- ------------ ---------
2 1 45 52428800 512 2 YES INACTIVE 1689826 23-MAR-18 1696689 23-MAR-18
4 1 46 262144000 512 1 NO CURRENT 1696689 23-MAR-18 2.8147E+14
5 1 0 262144000 512 1 YES UNUSED 0 0
6 1 0 262144000 512 1 YES UNUSED 0 0

Step 12 : Drop redo log of group 2 :

SQL> alter database drop logfile group 2;

Database altered.

SQL> select * from v$logfile;

GROUP# STATUS TYPE MEMBER IS_
---------- ------- ------- --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ---
4 ONLINE /u01/app/oracle/oradata/test/redo04.log NO
5 ONLINE /u01/app/oracle/oradata/test/redo05.log NO
6 ONLINE /u01/app/oracle/oradata/test/redo06.log NO

SQL>

We can see here , database is fully converted to Normal File System .

Stay tuned for More articles on Oracle RAC 

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