Is there a way to recover the spfile if I remove the spfile?

Question

Hi,
Is there a way to recover the spfile if I remove the spfile?
I did a rman full db backup.
thanks.

Answer 1

You can user RMAN to recover your spfile, see Note 372996.1 Using RMAN to Restore and Recover a Database When the Repository and Spfile/Init.ora Files Are Also Lost, RMAN is able to startup the instance even when there is no spfile/pfile, then you can recover your spfile from your last backup.
RMAN> startup nomount;
connected to target database (not started)
startup failed: ORA-01078: failure in processing system parameters
LRM-00109: could not open parameter file '/u01/app/oracle/product/10.2.0/db_1/dbs/initorcl.ora'
starting Oracle instance without parameter file for retrival of spfile
Oracle instance started
Total System Global Area     159383552 bytes
Fixed Size                     1266344 bytes
Variable Size                 54529368 bytes
Database Buffers             100663296 bytes
Redo Buffers                   2924544 bytes
RMAN> set dbid=1176145568;
executing command: SET DBID
RMAN> restore spfile from autobackup recovery area '/u01/app/oracle/flash_recovery_area';
Starting restore at 05/11/2008 10:49:53
using channel ORA_DISK_1
recovery area destination: /u01/app/oracle/flash_recovery_area
database name (or database unique name) used for search: ORCL
channel ORA_DISK_1: autobackup found in the recovery area
channel ORA_DISK_1: autobackup found: /u01/app/oracle/flash_recovery_area/ORCL/autobackup/2008_11_02/o1_mf_s_669748005_4jw93oyk_.bkp
channel ORA_DISK_1: SPFILE restore from autobackup complete
Finished restore at 05/11/2008 10:49:57The non-default parameters you set in your spfile are also listed in the alert.log so you can copy these values and create a pfile, then an spfile.
Starting up ORACLE RDBMS Version: 10.2.0.4.0.
System parameters with non-default values:
  processes                = 150
  nls_territory            = AMERICA
  sga_target               = 205520896
  control_files            = /u01/app/oracle/product/10.2.0/db_1/cfgtoollogs/dbca/orcl/tempControl.ctl
  db_block_size            = 8192
  compatible               = 10.2.0.3.0
  log_archive_format       = %t_%s_%r.dbf
  db_file_multiblock_read_count= 16
  db_create_file_dest      = /u02/oradata
  db_recovery_file_dest    = /u01/app/oracle/flash_recovery_area
  db_recovery_file_dest_size= 4294967296
  undo_management          = AUTO
  undo_tablespace          = UNDOTBS1
  remote_login_passwordfile= EXCLUSIVE
  db_domain                = oracle.com
  dispatchers              = (PROTOCOL=TCP) (SERVICE=orclXDB)
  job_queue_processes      = 10
  background_dump_dest     = /u01/app/oracle/admin/orcl/bdump
  user_dump_dest           = /u01/app/oracle/admin/orcl/udump
  core_dump_dest           = /u01/app/oracle/admin/orcl/cdump
  audit_file_dest          = /u01/app/oracle/admin/orcl/adump
  db_name                  = seeddata
  db_unique_name           = orcl
  open_cursors             = 300
  pga_aggregate_target     = 67108864
PMON started with pid=2, OS id=12906HTH
Enrique
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