PRM is designed for Enterprise Database Recovery, which includes all Oracle DUL data recovery functionalities, and also easy-to-use GUI.
PRM For Oracle Database 3.1 GUI:
PRM almost can recovery Oracle database on all operating system, including:
Linux (RedHat, Centos, Oracle Linux, Suse)，AIX, Solaris, HPUX, Windows 2003 Server/XP/2000/NT。
PRM Support Oracle database which starts from 9i, 10g, 11g to 12c.
Case 1, if there is no backup, on disk segment header is corrupted
SQL> create table prm_test tablespace users as select * from dba_objects;
Table created.
SQL> alter system checkpoint;
System altered.
SQL> select count(*) from prm_test;
COUNT(*)
----------
77940
SQL>
SQL> select header_file,header_block from dba_segments where segment_name='PRM_TEST';
HEADER_FILE HEADER_BLOCK
----------- ------------
4 1298483
SQL> select name from v$datafile where file#=4;
NAME
--------------------------------------------------------------------------------
/s01/oradata/G10R25/datafile/o1_mf_users_8nx5srgb_.dbf
BBED> set mode edit
MODE Edit
BBED> set blocksize 8192
BLOCKSIZE 8192
BBED> set block 1298483
BLOCK# 1298483
BBED> set offset 999
OFFSET 999
BBED> modify /x 0xffff
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
File: /s01/oradata/G10R25/datafile/o1_mf_users_8nx5srgb_.dbf (0)
Block: 1298483 Offsets: 999 to 1510 Dba:0x00000000
------------------------------------------------------------------------
ffff0000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
BBED> sum
Check value for File 0, Block 1298483:
current = 0x18cc, required = 0xe733
SQL> select count(*) from prm_test;
select count(*) from prm_test
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 4, block # 1298483)
ORA-01110: data file 4:
'/s01/oradata/G10R25/datafile/o1_mf_users_8nx5srgb_.dbf'
SQL> alter session set events '10231 trace name context forever ,level 10';
Session altered.
SQL> select count(*) from prm_test;
select count(*) from prm_test
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 4, block # 1298483)
ORA-01110: data file 4:
'/s01/oradata/G10R25/datafile/o1_mf_users_8nx5srgb_.dbf'
Start PRM
./prm.sh
Recovery Wizard=》Dictionary Mode, if ASM, then choose Dictionary Mode(ASM) =>select data files (at least including system tablespace datafile and datafile where data located), and click load.
Attention: on AIX HPUX Sparc Solaris, and UNIX platform, choose Big Endian. Linux, Windows, X86 Solaris choose Little Endian
Find your table on the left and right click View
If we PRM show correct data, we recommend you to use DataBridge mode for inserting data back. Right click DataBridge and input connection info, and click DataBridge
As above, it has been successfully extract 77940 rows
CASE 2, No Archive Mode, a datafile has been offline, and related redo log has been overwritten. User can’t online this datafile again.
SQL> archive log list
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination /s01/arch
Oldest online log sequence 343
Current log sequence 348
SQL> select file_name,file_id from dba_data_files where tablespace_name='TBS5';
FILE_NAME FILE_ID
---------------------------------------- ----------
/oracleasm/TBS5.256.844175363.dbf 6
SQL> alter database datafile 6 offline drop;
Database altered.
SQL> alter system switch logfile;
System altered.
SQL> /
System altered.
SQL> /
System altered.
SQL> /
System altered.
SQL> /
System altered.
SQL> /
System altered.
SQL> recover datafile 6;
ORA-00279: change 34421776 generated at 04/19/2014 19:33:32 needed for thread 1
ORA-00289: suggestion : /s01/arch/1_354_831398352.dbf
ORA-00280: change 34421776 for thread 1 is in sequence #354
Specify log: {=suggested | filename | AUTO | CANCEL}
cancel
Media recovery cancelled.
[oracle@vrh8 ~]$ rman target /
Recovery Manager: Release 10.2.0.5.0 - Production on Sat Apr 19 19:49:22 2014
Copyright (c) 1982, 2007, Oracle. All rights reserved.
connected to target database: G10R25 (DBID=2696593743)
RMAN> recover datafile 6;
Starting recover at 19-APR-14
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=147 devtype=DISK
starting media recovery
unable to find archive log
archive log thread=1 sequence=354
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 04/19/2014 19:49:29
RMAN-06054: media recovery requesting unknown log: thread 1 seq 354 lowscn 34421776
Here we can use PRM to extract all data which can not be online
SQL> select OWNER,SEGMENT_NAME,SEGMENT_TYPE from dba_segments where tablespace_name='TBS5';
OWNER SEGMENT_NAME SEGMENT_TYPE
----- ------------------------------ ------------------
SYS VVVV TABLE
SYS AVE2 TABLE
SYS AVE TABLE
SYS ATEST1 TABLE
SYS BIN$2KcAMnnvGg/gQKjAvwEbRg==$0 TABLE
hu TAB1 TABLE
Start PRM
./prm.sh
Recovery Wizard=》Dictionary Mode, if ASM, then choose Dictionary Mode(ASM) =>select data files (at least including SYSTEM.DBF and data file where data located), and click load.
Attention: on AIX HPUX Sparc Solaris, and UNIX platform, choose Big Endian. Linux, Windows, X86 Solaris choose Little Endian
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