Oracle DBA Tips Corner |
Duplicating an SPFILE from an ASM Diskgroup to the Local File System
by Jeff Hunter, Sr. Database Administrator
Suppose your database is stored using ASM including all physical database files and the SPFILE.
You already know and understand how to duplicate database files and even the control file
from ASM to the local file system using RMAN
(See Migrating Databases from non-ASM to ASM and Vice-Versa).
But what about the SPFILE? What if all you need to do is make a copy of the current SPFILE
file stored in ASM to the local file system? Your first thought might be to use RMAN, however,
there is a much easier method as described below. This method makes a copy of an SPFILE
stored in ASM to a text-based initialization parameter file on the local file system.
$ cat $ORACLE_HOME/dbs/initorcl1.ora SPFILE='+ORCL_DATA1/orcl/spfileorcl.ora'You can further verify that the SPFILE really does indeed reside in ASM by performing the following query against the ASM instance:
SELECT
CONCAT('+' || disk_group_name, SYS_CONNECT_BY_PATH(alias_name, '/')) full_alias_path
, NVL(LPAD(type, 18), '<DIRECTORY>') type
FROM
( SELECT
g.name disk_group_name
, a.parent_index pindex
, a.name alias_name
, a.reference_index rindex
, f.type type
FROM
v$asm_file f RIGHT OUTER JOIN v$asm_alias a USING (group_number, file_number)
JOIN v$asm_diskgroup g USING (group_number)
)
WHERE type = 'PARAMETERFILE'
START WITH (MOD(pindex, POWER(2, 24))) = 0
CONNECT BY PRIOR rindex = pindex;
File Name File Type
--------------------------------------------------- -------------
+ORCL_DATA1/ORCL/spfileorcl.ora PARAMETERFILE
+ORCL_DATA1/ORCL/PARAMETERFILE/spfile.268.600397949 PARAMETERFILE
SQL> CREATE PFILE='/u01/app/oracle/initorcl.ora' FROM SPFILE='+ORCL_DATA1/ORCL/spfileorcl.ora'; File created.
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