Check Database Running Parameter

[oratest@oracle ~]$ export ORACLE_SID=test
[oratest@oracle ~]$ sqlplus / as sysdba

SQL*Plus: Release 19.0.0.0.0 - Production on Wed Sep 8 21:25:19 2021
Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle.  All rights reserved.

Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0


SQL>  show parameter pfile;

NAME      TYPE        VALUE
------- ------- ------------------------------
spfile  string   /u01/app/oracle/product/19.0.0
                  /dbhome_1/dbs/spfiletest.ora

Connect RMAN and Backup the Spfile:

[oratest@oracle ~]$ rman target /

Recovery Manager: Release 19.0.0.0.0 - Production on Wed Sep 8 21:26:38 2021
Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle and/or its affiliates.  All rights reserved.

connected to target database: TEST (DBID=2378581000)

RMAN> backup spfile;

Starting backup at 08-SEP-21
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=66 device type=DISK
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
including current SPFILE in backup set
channel ORA_DISK_1: starting piece 1 at 08-SEP-21
channel ORA_DISK_1: finished piece 1 at 08-SEP-21
piece handle=/u01/app/oracle/oradata/TEST/backup/1208j2hb_1_1 tag=TAG20210908T212707 
comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 08-SEP-21

Starting Control File and SPFILE Autobackup at 08-SEP-21
piece handle=/u01/app/oracle/oradata/TEST/backup/c-2378581000-20210908-00 comment=NONE
Finished Control File and SPFILE Autobackup at 08-SEP-21

sqlplus / as sysdba

SQL*Plus: Release 19.0.0.0.0 - Production on Wed Sep 8 21:28:32 2021
Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle.  All rights reserved.

Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0

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

Move the Spfile to Backup File

[oracle@oracle ~]$ cd $ORACLE_HOME/dbs
[oracle@oracle dbs]$ ls
Spfiletest.ora  inittest.ora
[oracle@oracle dbs]$ mv spfiletest.ora spfiletest.ora_bkp
[oracle@oracle dbs]$ ls
initorcl.ora   Spfiletest.ora_bkp

[oratest@oracle dbs]$  rman target/

Recovery Manager: Release 19.0.0.0.0 - Production on Wed Sep 8 21:33:14 2021
Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle and/or its affiliates.  All rights reserved.

connected to target database (not started)

RMAN> set dbid 2378581000
executing command: SET DBID


start the database in force option with nomount stage

RMAN> startup force nomount;

Oracle instance started

Total System Global Area    1543500144 bytes

Fixed Size                     8896880 bytes
Variable Size                905969664 bytes
Database Buffers             620756992 bytes
Redo Buffers                   7876608 bytes

Restore the spfile from Auto backup Location

RMAN> restore spfile  from autobackup;
Starting restore at 08-SEP-21
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=38 device type=DISK
recovery area destination: /u01/app/oracle/fast_recovery_area
database name (or database unique name) used for search: TEST
channel ORA_DISK_1: AUTOBACKUP /u01/app/oracle/fast_recovery_area/TEST/autobackup/2021_09_05/o1_mf_s_1082499783_jm9xhjjd_.bkp found in the recovery area
channel ORA_DISK_1: looking for AUTOBACKUP on day: 20210905
channel ORA_DISK_1: restoring spfile from AUTOBACKUP /u01/app/oracle/fast_recovery_area/TEST/autobackup/2021_09_05/o1_mf_s_1082499783_jm9xhjjd_.bkp
channel ORA_DISK_1: SPFILE restore from AUTOBACKUP complete
Finished restore at 08-SEP-21
Recovery Manager complete.

[oracle@oracle ~]$ sqlplus / as sysdba
SQL*Plus: Release 19.0.0.0.0 - Production on Sun Sep 5 22:32:18 2021
Version 19.3.0.0.0
Copyright (c) 1982, 2019, Oracle.  All rights reserved.
Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0

SQL> select name,open_mode from v$database;
NAME      OPEN_MODE
--------- --------------------
TEST      MOUNTED

Using alter command open the database

SQL> alter database open;
Database altered.

SQL>  select name,open_mode from v$database;
NAME      OPEN_MODE
--------- --------------------
TEST      READ WRITE

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