Monday 29 January 2018

How to take compressed export backup in oracle 11g

[oracle@dba1 rman]$ expdp dumpfile=1.dmp logfile=1.log schemas=VENKY COMPRESSION=ALL

Export: Release 11.2.0.3.0 - Production on Wed Jan 24 21:37:07 2018

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Username: / as sysdba

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "SYS"."SYS_EXPORT_SCHEMA_01":  /******** AS SYSDBA dumpfile=1.dmp logfile=1.log schemas=VENKY COMPRESSION=ALL
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 320 KB
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/TABLE/TABLE
. . exported "VENKY"."BONUS"                             5.593 KB     896 rows
. . exported "VENKY"."DEPT"                              4.984 KB       4 rows
. . exported "VENKY"."DUMMY"                             4.687 KB       1 rows
. . exported "VENKY"."EMP"                               5.632 KB      14 rows
. . exported "VENKY"."SALGRADE"                          4.898 KB       5 rows
Master table "SYS"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYS.SYS_EXPORT_SCHEMA_01 is:
  /u01/app/oracle/admin/prd/dpdump/1.dmp
Job "SYS"."SYS_EXPORT_SCHEMA_01" successfully completed at 21:38:12


[oracle@dba1 rman]$ 
[oracle@dba1 rman]$ cd /u01/app/oracle/admin/prd/dpdump/
[oracle@dba1 dpdump]$ ll
total 104
-rw-r----- 1 oracle oinstall 94208 Jan 24 21:38 1.dmp
-rw-r--r-- 1 oracle oinstall  1592 Jan 24 21:38 1.log
-rw-r----- 1 oracle oinstall   116 Nov 12 14:48 dp.log
[oracle@dba1 dpdump]$ impdp dumpfile=1.dmp logfile=1.log remap_schema=VENKY:MANI

Import: Release 11.2.0.3.0 - Production on Wed Jan 24 21:40:39 2018

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Username: / as sysdba

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "SYS"."SYS_IMPORT_FULL_01" successfully loaded/unloaded
Starting "SYS"."SYS_IMPORT_FULL_01":  /******** AS SYSDBA dumpfile=1.dmp logfile=1.log remap_schema=VENKY:MANI
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/TABLE/TABLE
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
. . imported "MANI"."BONUS"                              5.593 KB     896 rows
. . imported "MANI"."DEPT"                               4.984 KB       4 rows
. . imported "MANI"."DUMMY"                              4.687 KB       1 rows
. . imported "MANI"."EMP"                                5.632 KB      14 rows
. . imported "MANI"."SALGRADE"                           4.898 KB       5 rows
Job "SYS"."SYS_IMPORT_FULL_01" successfully completed at 21:40:46

[oracle@dba1 dpdump]$

How to restore and recover a differential incremental Oracle database backup

How to restore and recover a differential incremental Oracle database backup


Scenario: We have Level 0 backup on Tuesday, Level 1 Differential backup on Wednesday & Thursday and Level 1 Cumulative on Friday. On the very next day Saturday, due to media failure database has been crashed, in this case how to recover from above mentioned RMAN backups.

Here is practical approach to recover database.


login as: oracle
oracle@192.168.173.2's password:
Last login: Fri Jan 26 19:55:42 2018 from 192.168.173.1
[oracle@dba1 ~]$
[oracle@dba1 ~]$
[oracle@dba1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Mon Jan 29 18:36:44 2018

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area 1703624704 bytes
Fixed Size                  2229024 bytes
Variable Size             452988128 bytes
Database Buffers         1241513984 bytes
Redo Buffers                6893568 bytes
Database mounted.
Database opened.
SQL> set time on
18:37:24 SQL>
18:37:24 SQL>
18:37:24 SQL>
18:37:29 SQL>
18:37:30 SQL> disc
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64                                                                                        bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
18:37:33 SQL>
18:37:33 SQL> conn venky/venky
Connected.
18:37:37 SQL> 
18:37:39 SQL>
18:37:39 SQL>
18:37:43 SQL>
18:37:43 SQL> sho user
USER is "VENKY"
18:37:45 SQL>
18:37:45 SQL> select * from tab;

TNAME                          TABTYPE  CLUSTERID
------------------------------ ------- ----------
BONUS                          TABLE
DEPT                            TABLE
DUMMY                         TABLE
EMP                              TABLE
SALGRADE                     TABLE

18:37:51 SQL> select count(1) from bonus;

  COUNT(1)
----------
      3584

18:37:59 SQL> select count(1) from dept;

  COUNT(1)
----------
         4

18:38:08 SQL> select count(1) from DUMMY
18:38:20   2  ;

  COUNT(1)
----------
         1

18:38:21 SQL> select count(1) from emp;

  COUNT(1)
----------
        14

18:38:27 SQL>  select count(1) from SALGRADE;

  COUNT(1)
----------
         5

18:38:37 SQL>
18:39:05 SQL>
18:39:05 SQL> disc
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
18:39:10 SQL>
18:39:11 SQL> conn / as sysdba
Connected.
18:39:17 SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     2
Next log sequence to archive   4
Current log sequence           4
18:39:21 SQL>
18:39:22 SQL> shut immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
18:39:38 SQL> disc
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
18:40:12 SQL> exit
[oracle@dba1 ~]$
[oracle@dba1 ~]$
[oracle@dba1 ~]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3             8.8G  6.0G  2.3G  73% /
/dev/sda7             4.9G  153M  4.5G   4% /tmp
/dev/sda5             8.7G  7.0G  1.3G  86% /home
/dev/sda2              13G  6.9G  5.3G  57% /u01
/dev/sda1             4.9G  178M  4.5G   4% /boot
tmpfs                 2.7G     0  2.7G   0% /dev/shm
[oracle@dba1 ~]$
[oracle@dba1 ~]$ cd /u01
[oracle@dba1 u01]$ ll
total 28
drwxrwxr-x 4 oracle oinstall  4096 Nov 11 22:52 app
drwxr-xr-x 3 oracle oinstall  4096 Nov 12 15:48 app1
drwxrwxr-x 2 oracle oinstall 16384 Nov 11 09:33 lost+found
drwxr-xr-x 5 oracle oinstall  4096 Jan 23 20:55 prd
[oracle@dba1 u01]$ cd prd/
[oracle@dba1 prd]$ ll
total 12
drwxr-xr-x 3 oracle oinstall 4096 Nov 12 14:45 datafiles
drwxr-xr-x 2 oracle oinstall 4096 Jan 23 21:02 db_create
drwxr-xr-x 2 oracle oinstall 4096 Jan 26 20:00 rman
[oracle@dba1 prd]$ cd datafiles/
[oracle@dba1 datafiles]$ ll
total 4
drwxr-x--- 2 oracle oinstall 4096 Nov 12 14:48 prd
[oracle@dba1 datafiles]$ cd prd/
[oracle@dba1 prd]$ ll
total 1461088
-rw-r----- 1 oracle oinstall   9748480 Jan 29 18:39 control01.ctl
-rw-r----- 1 oracle oinstall  52429312 Jan 29 18:39 redo01.log
-rw-r----- 1 oracle oinstall  52429312 Jan 29 18:37 redo02.log
-rw-r----- 1 oracle oinstall  52429312 Jan 29 18:37 redo03.log
-rw-r----- 1 oracle oinstall 545267712 Jan 29 18:39 sysaux01.dbf
-rw-r----- 1 oracle oinstall 744497152 Jan 29 18:39 system01.dbf
-rw-r----- 1 oracle oinstall  20979712 Jan 29 18:37 temp01.dbf
-rw-r----- 1 oracle oinstall  31465472 Jan 29 18:39 undotbs01.dbf
-rw-r----- 1 oracle oinstall   5251072 Jan 29 18:39 users01.dbf

[oracle@dba1 prd]$ rm *    (manually I have deleted all the datafiles)

[oracle@dba1 prd]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Mon Jan 29 18:44:33 2018

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area 1703624704 bytes
Fixed Size                  2229024 bytes
Variable Size             452988128 bytes
Database Buffers         1241513984 bytes
Redo Buffers                6893568 bytes
ORA-00205: error in identifying control file, check alert log for more info


SQL> shut abort
ORACLE instance shut down.
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64                                                                                        bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@dba1 prd]$
[oracle@dba1 prd]$ cd /u01/prd/rman/
[oracle@dba1 rman]$ ll
total 1075824
-rw-r----- 1 oracle oinstall 1046519808 Jan 23 21:06 230118_level0.bkp
-rw-r----- 1 oracle oinstall    4153344 Jan 24 21:33 240118_levle0_diff.bkp
-rw-r----- 1 oracle oinstall    9797632 Jan 24 21:39 cf_wed.ctl
-rw-r----- 1 oracle oinstall   11927552 Jan 26 19:59 fridy_cum.bkp
-rw-r----- 1 oracle oinstall    9797632 Jan 26 20:00 fridy_cum_CF.ctl
-rw-r----- 1 oracle oinstall    9797632 Jan 25 20:31 thurs_cf.ctl
-rw-r----- 1 oracle oinstall    8536064 Jan 25 20:31 thurs_levl0.bkp
[oracle@dba1 rman]$ ls -ltr
total 1075824
-rw-r----- 1 oracle oinstall 1046519808 Jan 23 21:06 230118_level0.bkp
-rw-r----- 1 oracle oinstall    4153344 Jan 24 21:33 240118_levle0_diff.bkp
-rw-r----- 1 oracle oinstall    9797632 Jan 24 21:39 cf_wed.ctl
-rw-r----- 1 oracle oinstall    8536064 Jan 25 20:31 thurs_levl0.bkp
-rw-r----- 1 oracle oinstall    9797632 Jan 25 20:31 thurs_cf.ctl
-rw-r----- 1 oracle oinstall   11927552 Jan 26 19:59 fridy_cum.bkp
-rw-r----- 1 oracle oinstall    9797632 Jan 26 20:00 fridy_cum_CF.ctl
[oracle@dba1 rman]$
[oracle@dba1 rman]$
[oracle@dba1 rman]$ rman target /

Recovery Manager: Release 11.2.0.3.0 - Production on Mon Jan 29 18:45:16 2018

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

connected to target database (not started)

RMAN>

RMAN> startup nomount;

Oracle instance started

Total System Global Area    1703624704 bytes

Fixed Size                     2229024 bytes
Variable Size                452988128 bytes
Database Buffers            1241513984 bytes
Redo Buffers                   6893568 bytes

RMAN>  
RMAN> restore controlfile from '/u01/prd/rman/fridy_cum_CF.ctl';

Starting restore at 29-JAN-18
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=19 device type=DISK

channel ORA_DISK_1: restoring control file
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
output file name=/u01/prd/datafiles/prd/control01.ctl
output file name=/u01/app/oracle/fast_recovery_area/prd/control02.ctl
Finished restore at 29-JAN-18

RMAN> exit

(In latest available controlfile, it contains all the backup information. So we have restore latest controlfile and lets bring the database in mount mode)

Recovery Manager complete.
[oracle@dba1 rman]$ ls -ltr
total 1075824
-rw-r----- 1 oracle oinstall 1046519808 Jan 23 21:06 230118_level0.bkp
-rw-r----- 1 oracle oinstall    4153344 Jan 24 21:33 240118_levle0_diff.bkp
-rw-r----- 1 oracle oinstall    9797632 Jan 24 21:39 cf_wed.ctl
-rw-r----- 1 oracle oinstall    8536064 Jan 25 20:31 thurs_levl0.bkp
-rw-r----- 1 oracle oinstall    9797632 Jan 25 20:31 thurs_cf.ctl
-rw-r----- 1 oracle oinstall   11927552 Jan 26 19:59 fridy_cum.bkp
-rw-r----- 1 oracle oinstall    9797632 Jan 26 20:00 fridy_cum_CF.ctl
[oracle@dba1 rman]$ cd ../
[oracle@dba1 prd]$ ll
total 12
drwxr-xr-x 3 oracle oinstall 4096 Nov 12 14:45 datafiles
drwxr-xr-x 2 oracle oinstall 4096 Jan 23 21:02 db_create
drwxr-xr-x 2 oracle oinstall 4096 Jan 26 20:00 rman
[oracle@dba1 prd]$ cd datafiles/prd/
[oracle@dba1 prd]$ ll
total 9536
-rw-r----- 1 oracle oinstall 9748480 Jan 29 18:52 control01.ctl
[oracle@dba1 prd]$ pwd
/u01/prd/datafiles/prd
[oracle@dba1 prd]$
[oracle@dba1 prd]$
[oracle@dba1 prd]$ cd /u01/prd/rman/
[oracle@dba1 rman]$ ll
total 1075824
-rw-r----- 1 oracle oinstall 1046519808 Jan 23 21:06 230118_level0.bkp
-rw-r----- 1 oracle oinstall    4153344 Jan 24 21:33 240118_levle0_diff.bkp
-rw-r----- 1 oracle oinstall    9797632 Jan 24 21:39 cf_wed.ctl
-rw-r----- 1 oracle oinstall   11927552 Jan 26 19:59 fridy_cum.bkp
-rw-r----- 1 oracle oinstall    9797632 Jan 26 20:00 fridy_cum_CF.ctl
-rw-r----- 1 oracle oinstall    9797632 Jan 25 20:31 thurs_cf.ctl
-rw-r----- 1 oracle oinstall    8536064 Jan 25 20:31 thurs_levl0.bkp
[oracle@dba1 rman]$
[oracle@dba1 rman]$
[oracle@dba1 rman]$ rman target /

Recovery Manager: Release 11.2.0.3.0 - Production on Mon Jan 29 18:56:18 2018

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

connected to target database: PRD (not mounted)

RMAN> alter database mount;

using target database control file instead of recovery catalog
database mounted

RMAN> list backup summary ;


List of Backups
===============
Key     TY LV S Device Type Completion Time #Pieces #Copies Compressed Tag
------- -- -- - ----------- --------------- ------- ------- ---------- ---
2       B  F  A DISK        23-JAN-18       1       1       NO         TAG20180123T205322
3       B  0  A DISK        23-JAN-18       1       1       NO         TUESDAY_LEVEL0
4       B  F  A DISK        23-JAN-18       1       1       NO         TAG20180123T210739
5       B  1  A DISK        24-JAN-18       1       1       NO         WED_LEVEL1_DIF
6       B  F  A DISK        24-JAN-18       1       1       NO         TAG20180124T213340
7       B  F  A DISK        24-JAN-18       1       1       NO         TAG20180124T213931
8       B  F  A DISK        24-JAN-18       1       1       NO         TAG20180124T213933
9       B  1  A DISK        25-JAN-18       1       1       NO         THURSDAY_LEVEL0
10      B  F  A DISK        25-JAN-18       1       1       NO         TAG20180125T203119
11      B  F  A DISK        25-JAN-18       1       1       NO         TAG20180125T203150
12      B  F  A DISK        25-JAN-18       1       1       NO         TAG20180125T203152
13      B  1  A DISK        26-JAN-18       1       1       NO         FRIDAY_LEVEL1_CUM
14      B  F  A DISK        26-JAN-18       1       1       NO         TAG20180126T195932

RMAN>   restore database;

Starting restore at 29-JAN-18
Starting implicit crosscheck backup at 29-JAN-18
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=1 device type=DISK
Crosschecked 13 objects
Finished implicit crosscheck backup at 29-JAN-18

Starting implicit crosscheck copy at 29-JAN-18
using channel ORA_DISK_1
Finished implicit crosscheck copy at 29-JAN-18

searching for all files in the recovery area
cataloging files...
cataloging done

List of Cataloged Files
=======================
File Name: /u01/app/oracle/fast_recovery_area/PRD/autobackup/2018_01_26/o1_mf_s_966456025_f6pgw14b_.bkp

using channel ORA_DISK_1

channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00001 to /u01/prd/datafiles/prd/system01.dbf
channel ORA_DISK_1: restoring datafile 00002 to /u01/prd/datafiles/prd/sysaux01.dbf
channel ORA_DISK_1: restoring datafile 00003 to /u01/prd/datafiles/prd/undotbs01.dbf
channel ORA_DISK_1: restoring datafile 00004 to /u01/prd/datafiles/prd/users01.dbf
channel ORA_DISK_1: reading from backup piece /u01/prd/rman/230118_level0.bkp
channel ORA_DISK_1: piece handle=/u01/prd/rman/230118_level0.bkp tag=TUESDAY_LEVEL0
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:01:45
Finished restore at 29-JAN-18

RMAN> recover database;

Starting recover at 29-JAN-18
using channel ORA_DISK_1
channel ORA_DISK_1: starting incremental datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
destination for restore of datafile 00001: /u01/prd/datafiles/prd/system01.dbf
destination for restore of datafile 00002: /u01/prd/datafiles/prd/sysaux01.dbf
destination for restore of datafile 00003: /u01/prd/datafiles/prd/undotbs01.dbf
destination for restore of datafile 00004: /u01/prd/datafiles/prd/users01.dbf
channel ORA_DISK_1: reading from backup piece /u01/prd/rman/fridy_cum.bkp
channel ORA_DISK_1: piece handle=/u01/prd/rman/fridy_cum.bkp tag=FRIDAY_LEVEL1_CUM
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:07

starting media recovery

unable to find archived log
archived log thread=1 sequence=4
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 01/29/2018 19:01:24
RMAN-06054: media recovery requesting unknown archived log for thread 1 with sequence 4 and starting SCN of 1037192

RMAN> alter database open resetlogs;

database opened

RMAN> quit


Recovery Manager complete.
[oracle@dba1 rman]$
[oracle@dba1 rman]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Mon Jan 29 19:03:29 2018

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> select name from v$database;

NAME
---------
PRD

SQL>
SQL>
SQL>
SQL> disc
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL>
SQL> conn venky
Enter password:
Connected.
SQL>
SQL>
SQL> select * from tab;

TNAME                          TABTYPE  CLUSTERID
------------------------------ ------- ----------
BONUS                          TABLE
DEPT                           TABLE
DUMMY                          TABLE
EMP                            TABLE
SALGRADE                       TABLE

SQL> select count(1) from bonus;

  COUNT(1)
----------
      3584

SQL> select count(1) from dept;

  COUNT(1)
----------
         4

SQL> select count(1) from dummy;

  COUNT(1)
----------
         1

SQL> select count(1) from emp;

  COUNT(1)
----------
        14

SQL> select count(1) from SALGRADE;

  COUNT(1)
----------
         5

SQL> 
SQL> disc
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL>
SQL> conn / as sysdba
Connected.
SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     1
Next log sequence to archive   1
Current log sequence           1
SQL>
SQL> !
[oracle@dba1 rman]$
[oracle@dba1 rman]$ cd ../
[oracle@dba1 prd]$ l
bash: l: command not found
[oracle@dba1 prd]$ ll
total 12
drwxr-xr-x 3 oracle oinstall 4096 Nov 12 14:45 datafiles
drwxr-xr-x 3 oracle oinstall 4096 Jan 29 19:02 db_create
drwxr-xr-x 2 oracle oinstall 4096 Jan 26 20:00 rman
[oracle@dba1 prd]$ cd datafiles/
[oracle@dba1 datafiles]$
[oracle@dba1 datafiles]$ ll
total 4
drwxr-x--- 2 oracle oinstall 4096 Jan 29 19:03 prd
[oracle@dba1 datafiles]$ cd prd/
[oracle@dba1 prd]$ ll
total 1461080
-rw-r----- 1 oracle oinstall   9748480 Jan 29 19:07 control01.ctl
-rw-r----- 1 oracle oinstall  52429312 Jan 29 19:05 redo01.log
-rw-r----- 1 oracle oinstall  52429312 Jan 29 19:03 redo02.log
-rw-r----- 1 oracle oinstall  52429312 Jan 29 19:03 redo03.log
-rw-r----- 1 oracle oinstall 545267712 Jan 29 19:03 sysaux01.dbf
-rw-r----- 1 oracle oinstall 744497152 Jan 29 19:03 system01.dbf
-rw-r----- 1 oracle oinstall  20979712 Jan 29 19:03 temp01.dbf
-rw-r----- 1 oracle oinstall  31465472 Jan 29 19:03 undotbs01.dbf
-rw-r----- 1 oracle oinstall   5251072 Jan 29 19:03 users01.dbf
[oracle@dba1 prd]$ pwd
/u01/prd/datafiles/prd
[oracle@dba1 prd]$
[oracle@dba1 prd]$

Tuesday 23 January 2018

How to enable Flashback in oracle database 11g

How to enable Flashback in oracle database 11g


[oracle@dba1 ]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Tue Jan 23 20:27:54 2018

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup;
ORACLE instance started.

Total System Global Area 1703624704 bytes
Fixed Size                  2229024 bytes
Variable Size             419433696 bytes
Database Buffers         1275068416 bytes
Redo Buffers                6893568 bytes
Database mounted.
Database opened.
SQL> !df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3             8.8G  6.0G  2.3G  73% /
/dev/sda7             4.9G  153M  4.5G   4% /tmp
/dev/sda5             8.7G  7.0G  1.3G  86% /home
/dev/sda2              13G  5.7G  6.6G  47% /u01
/dev/sda1             4.9G  178M  4.5G   4% /boot
tmpfs                 2.7G     0  2.7G   0% /dev/shm

SQL> archive log list
Database log mode              No Archive Mode
Automatic archival             Disabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     1
Current log sequence           3
SQL> sho parameter db_recover

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest                string      /u01/app/oracle/fast_recovery_
                                                 area
db_recovery_file_dest_size           big integer 4122M
SQL>
SQL>
SQL> shut immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

1) Database should be in archive log mode


SQL> startup mount;
ORACLE instance started.

Total System Global Area 1703624704 bytes
Fixed Size                  2229024 bytes
Variable Size             419433696 bytes
Database Buffers         1275068416 bytes
Redo Buffers                6893568 bytes
Database mounted.

SQL> 
SQL> alter database archivelog;

Database altered.

SQL> alter database open;

Database altered.

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     1
Next log sequence to archive   3
Current log sequence           3
SQL>
SQL>
SQL>
SQL> sho parameter db_recovery

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest                string      /u01/app/oracle/fast_recovery_
                                                 area
db_recovery_file_dest_size           big integer 4122M
SQL>
SQL>
SQL>
SQL>
SQL> sho parameter undo

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
undo_management                      string      AUTO
undo_retention                       integer     900
undo_tablespace                      string      UNDOTBS1
SQL>
SQL> shut immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

2)  Enable Flashback 

SQL>
SQL> startup mount
ORACLE instance started.

Total System Global Area 1703624704 bytes
Fixed Size                  2229024 bytes
Variable Size             419433696 bytes
Database Buffers         1275068416 bytes
Redo Buffers                6893568 bytes
Database mounted.

SQL> select flashback_on from v$database;

FLASHBACK_ON
------------------
NO

SQL>
SQL> alter database flashback on;

Database altered.

SQL> select flashback_on from v$database;

FLASHBACK_ON
------------------
YES

SQL>
SQL> alter database open;

Database altered.

SQL>
SQL> select NAME,OPEN_MODE,FLASHBACK_ON,LOG_MODE from v$database;

NAME      OPEN_MODE            FLASHBACK_ON       LOG_MODE
--------- -------------------- ------------------ ------------
PRD       READ WRITE           YES                ARCHIVELOG