Old controfile during recovery

Hi guys,.

Let's say I am performing system copy and creating new controlfile to trace. What would happen if I accidentally delete a data file entry (say test.data1) of this track and create controlfile to trace? When you create controlfile didn't place the error as a trace script doesn't know nothing test.data1 should be included in the controlfile. My question is: is it possible that I have run recovery and get in the database to open the State? And that the test.data1 file is completely omitted from the database?
Thank you very much!

tdkuser wrote:
Hi guys,.

Let's say I am performing system copy and creating new controlfile to trace. What would happen if I accidentally > remove a data file entry (say test.data1) of this track and create controlfile to trace?

Expensive tdkuser nothing happen during create controlfile. But when you try to open database, then you will see in the alert.log than some information related to this data file. Because in datadictionary actually there is information on this data file, however controlfile does not contain information about this data file (in this case, this data called missing datafile file).

When you create controlfile didn't place the error as a trace script doesn't know nothing test.data1 should be included in the controlfile. My question is: is it possible that I have run recovery and get in the database to open the State? And that the test.data1 file is completely omitted from the database?
Thank you very much!

Yes, you can retrieve this data file while the database is open state if this file exists physically at the OS level and that this data file is not omitted from the database. Finally, you see at the bottom of the example.

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Jul 8 20:14:48 2010

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

SQL> alter tablespace users add datafile
  2  'D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\user02.dbf' size 10M;

Tablespace altered.

SQL> select name from v$datafile;

NAME
--------------------------------------------------------------------------------

D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\SYSTEM01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\UNDOTBS01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\SYSAUX01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\USERS01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\EXAMPLE01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\USER02.DBF

6 rows selected.

SQL> alter database backup controlfile to trace as 'c:\c.txt';
alter database backup controlfile to trace as 'c:\c.txt'
*
ERROR at line 1:
ORA-01277: file 'C:\C.TXT' already exists

SQL> alter database backup controlfile to trace as 'c:\c.txt' reuse;

Database altered.

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup nomount;
ORACLE instance started.

Total System Global Area  125829120 bytes
Fixed Size                  1247660 bytes
Variable Size              62916180 bytes
Database Buffers           58720256 bytes
Redo Buffers                2945024 bytes
SQL> CREATE CONTROLFILE REUSE DATABASE "TEST" NORESETLOGS  NOARCHIVELOG
  2      MAXLOGFILES 16
  3      MAXLOGMEMBERS 3
  4      MAXDATAFILES 100
  5      MAXINSTANCES 8
  6      MAXLOGHISTORY 292
  7  LOGFILE
  8    GROUP 1 'D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\REDO01.LOG'  SIZE 50M,
  9    GROUP 2 'D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\REDO02.LOG'  SIZE 50M,
 10    GROUP 3 'D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\REDO03.LOG'  SIZE 50M
 11  DATAFILE
 12    'D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\SYSTEM01.DBF',
 13    'D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\UNDOTBS01.DBF',
 14    'D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\SYSAUX01.DBF',
 15    'D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\USERS01.DBF',
 16    'D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\EXAMPLE01.DBF';

Control file created.

SQL> desc v$recover_file;
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------

 FILE#                                              NUMBER
 ONLINE                                             VARCHAR2(7)
 ONLINE_STATUS                                      VARCHAR2(7)
 ERROR                                              VARCHAR2(18)
 CHANGE#                                            NUMBER
 TIME                                               DATE

SQL> select file#,error from v$recover_file;

no rows selected

SQL> select name from v$datafile;

NAME
--------------------------------------------------------------------------------

D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\SYSTEM01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\UNDOTBS01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\SYSAUX01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\USERS01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\EXAMPLE01.DBF

SQL> alter database open;

Database altered.

SQL> select file#,error from v$recover_file;

     FILE# ERROR
---------- -----------------------------------------------------------------
         6 FILE MISSING

SQL> select name from v$datafile;

NAME
--------------------------------------------------------------------------------

D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\SYSTEM01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\UNDOTBS01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\SYSAUX01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\USERS01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\EXAMPLE01.DBF
D:\ORACLE\PRODUCT\10.2.0\DB_1\DATABASE\MISSING00006

6 rows selected.

SQL> alter database rename file 'D:\ORACLE\PRODUCT\10.2.0\DB_1\DATABASE\MISSING0
0006' to 'D:\oracle\product\10.2.0\oradata\TEST\USER02.DBF';

Database altered.

SQL> recover datafile 6;
Media recovery complete.
SQL> alter database datafile 6 online;

Database altered.
SQL> select name from v$datafile;

NAME
---------------------------------------------------------

D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\SYSTEM01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\UNDOTBS01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\SYSAUX01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\USERS01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\EXAMPLE01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\USER02.DBF

6 rows selected.

SQL>

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