Posts Tagged Backup & Recovery

FLASHBACK PLUGGABLE DATABASE now available in #Oracle 12cR2

flash

With the current release 12.2, flashback can be done on the PDB layer. As a prerequisite, the database must be put into local undo mode. That means that each PDB has its own undo tablespace. Some other 12.2 features like hot PDB cloning also require this, so chances are that most 12cR2 multitenant databases will be using that mode.

SQL> select banner from v$version;

BANNER
--------------------------------------------------------------------
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Pr
oduction

PL/SQL Release 12.2.0.1.0 - Production
CORE    12.2.0.1.0      Production
TNS for Linux: Version 12.2.0.1.0 - Production
NLSRTL Version 12.2.0.1.0 - Production

SQL> select name,open_mode,con_id from v$pdbs;

NAME            OPEN_MODE  CON_ID
--------------- ---------- ------
PDB$SEED        READ ONLY       2
PDB1            READ WRITE      3

SQL> select name,con_id from v$tablespace;

NAME            CON_ID
--------------- ------
SYSAUX               1
SYSTEM               1
UNDOTBS1             1
USERS                1
TEMP                 1
SYSTEM               2
SYSAUX               2
SYSTEM               3
TEMP                 2
SYSAUX               3
TEMP                 3

11 rows selected.

Initially, this database operates in what we call now shared undo mode: There is only one undo tablespace in the root container that is shared by all PDBs. Let’s change that to local undo mode:

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

Total System Global Area 1426063360 bytes
Fixed Size                  8792776 bytes
Variable Size             486540600 bytes
Database Buffers          922746880 bytes
Redo Buffers                7983104 bytes
Database mounted.
Database opened.
SQL> alter database local undo on;

Database altered.

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

Total System Global Area 1426063360 bytes
Fixed Size                  8792776 bytes
Variable Size             486540600 bytes
Database Buffers          922746880 bytes
Redo Buffers                7983104 bytes
Database mounted.
Database opened.
SQL> select name,con_id from v$tablespace;

NAME            CON_ID
--------------- ------
SYSAUX               1
SYSTEM               1
UNDOTBS1             1
USERS                1
TEMP                 1
SYSTEM               2
SYSAUX               2
SYSTEM               3
TEMP                 2
SYSAUX               3
TEMP                 3
UNDO_1               2

12 rows selected.

CON_ID 2 is the seed PDB, which got a local undo tablespace already. The pdb1 gets it as soon as it is opened:

SQL> alter pluggable database all open;

SQL> select name,con_id from v$tablespace;

NAME       CON_ID
---------- ------
SYSAUX          1
SYSTEM          1
UNDOTBS1        1
USERS           1
TEMP            1
SYSTEM          2
SYSAUX          2
SYSTEM          3
TEMP            2
SYSAUX          3
TEMP            3
UNDO_1          2
UNDO_1          3

SQL> select name from v$datafile where con_id=3;

NAME
--------------------------------------------------------------------
/u02/app/oracle/oradata/pdb1/system01.dbf
/u02/app/oracle/oradata/pdb1/sysaux01.dbf
/u02/app/oracle/oradata/pdb1/pdb1_i1_undo.dbf

Now to the flashback!

SQL> select flashback_on from v$database;

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

SQL> alter pluggable database pdb1 close immediate;

Pluggable database altered.

SQL> flashback pluggable database pdb1 to timestamp systimestamp - interval '2' minute;

Flashback complete.

SQL> alter pluggable database pdb1 open resetlogs;

Pluggable database altered.

Of course, that works much faster than a PDB PITR🙂

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2 Comments

How to speed up Data Pump Import by suppressing redo generation in #Oracle 12c

fast

With your database in archive log mode, a Data Pump Import may be severely slowed down by the writing of much redo into online logs and the the generation of many archive logs. A 12c New Feature enables you to avoid that slow down by suppressing redo generation for the import only. You can keep the database in archive log mode the whole time. Let’s see that in action!

First without the new feature:

[oracle@uhesse ~]$ sqlplus adam/adam

SQL*Plus: Release 12.1.0.2.0 Production on Tue Oct 25 20:25:25 2016

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

Last Successful login time: Tue Oct 25 2016 20:24:55 +02:00

Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options

SQL> select log_mode from v$database;

LOG_MODE
------------------------------------
ARCHIVELOG

SQL> select * from v$recovery_area_usage;

FILE_TYPE		       PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES	CON_ID
------------------------------ ------------------ ------------------------- --------------- ----------
CONTROL FILE					0			  0		  0	     0
REDO LOG					0			  0		  0	     0
ARCHIVED LOG				    15.37			 15		 10	     0
BACKUP PIECE				    25.17			  0		  2	     0
IMAGE COPY					0			  0		  0	     0
FLASHBACK LOG					0			  0		  0	     0
FOREIGN ARCHIVED LOG				0			  0		  0	     0
AUXILIARY DATAFILE COPY 			0			  0		  0	     0

8 rows selected.

SQL> exit
Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
[oracle@uhesse ~]$ impdp adam/adam tables=sales directory=DPDIR

Import: Release 12.1.0.2.0 - Production on Tue Oct 25 20:26:45 2016

Copyright (c) 1982, 2014, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
Master table "ADAM"."SYS_IMPORT_TABLE_01" successfully loaded/unloaded
Starting "ADAM"."SYS_IMPORT_TABLE_01":  adam/******** tables=sales directory=DPDIR 
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
. . imported "ADAM"."SALES"                              510.9 MB 10000000 rows
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
Job "ADAM"."SYS_IMPORT_TABLE_01" successfully completed at Tue Oct 25 20:29:46 2016 elapsed 0 00:03:00
[oracle@uhesse ~]$ sqlplus adam/adam

SQL*Plus: Release 12.1.0.2.0 Production on Tue Oct 25 20:30:03 2016

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

Last Successful login time: Tue Oct 25 2016 20:26:45 +02:00

Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options

SQL> select * from v$recovery_area_usage;

FILE_TYPE		       PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES	CON_ID
------------------------------ ------------------ ------------------------- --------------- ----------
CONTROL FILE					0			  0		  0	     0
REDO LOG					0			  0		  0	     0
ARCHIVED LOG				    30.63			 15		 17	     0
BACKUP PIECE				    25.17			  0		  2	     0
IMAGE COPY					0			  0		  0	     0
FLASHBACK LOG					0			  0		  0	     0
FOREIGN ARCHIVED LOG				0			  0		  0	     0
AUXILIARY DATAFILE COPY 			0			  0		  0	     0

8 rows selected.

The import took 3 minutes and generated 7 archive logs. Now with the new feature:

SQL> drop table sales purge;

Table dropped.

SQL> exit
Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
[oracle@uhesse ~]$ impdp adam/adam tables=adam.sales directory=DPDIR transform=disable_archive_logging:Y

Import: Release 12.1.0.2.0 - Production on Tue Oct 25 20:31:20 2016

Copyright (c) 1982, 2014, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
Master table "ADAM"."SYS_IMPORT_TABLE_01" successfully loaded/unloaded
Starting "ADAM"."SYS_IMPORT_TABLE_01":  adam/******** tables=adam.sales directory=DPDIR transform=disable_archive_logging:Y 
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
. . imported "ADAM"."SALES"                              510.9 MB 10000000 rows
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
Job "ADAM"."SYS_IMPORT_TABLE_01" successfully completed at Tue Oct 25 20:32:15 2016 elapsed 0 00:00:54

[oracle@uhesse ~]$ sqlplus adam/adam

SQL*Plus: Release 12.1.0.2.0 Production on Tue Oct 25 20:32:25 2016

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

Last Successful login time: Tue Oct 25 2016 20:31:20 +02:00

Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options

SQL> select * from v$recovery_area_usage;

FILE_TYPE		       PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES	CON_ID
------------------------------ ------------------ ------------------------- --------------- ----------
CONTROL FILE					0			  0		  0	     0
REDO LOG					0			  0		  0	     0
ARCHIVED LOG				    30.63			 15		 17	     0
BACKUP PIECE				    25.17			  0		  2	     0
IMAGE COPY					0			  0		  0	     0
FLASHBACK LOG					0			  0		  0	     0
FOREIGN ARCHIVED LOG				0			  0		  0	     0
AUXILIARY DATAFILE COPY 			0			  0		  0	     0

8 rows selected.

SQL> select logging from user_tables where table_name='SALES';

LOGGING
---------
YES

About three times faster and no archive log generated! The table is still in logging mode after the import. Keep in mind to take a backup of the datafile that contains the table now, though! For the same reason you should take a backup after a NOLOGGING operation🙂

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5 Comments

How to do PDB PITR in #Oracle 12c

A logical error happened in one Pluggable Database. A PDB Point-In-Time-Recovery rewinds it while the others remain available and stay as they are.

Logical error in PDB2

Logical error in PDB2

The blue arrow represents the Multitenant Database cdb1 with all its containers. A while back in the past, a logical error affected only pdb2. cdb1 is in Archive Log Mode and backups from before the logical error of at least the root container and pdb2 are available. What happens now upon PDB PITR is quite similar to a Tablespace PITR: Backups of root and pdb2 are being restored. All other PDBs can be skipped. A PITR to rewind pdb2 only is done with the help of a temporary instance while cdb1 keeps running. Space is needed to restore the root container files to an auxiliary destination, while the pdb2 files will be restored over the existing files from pdb2:

PDB PITR

PDB PITR

Let’s see that in action!

[oracle@uhesse ~]$ export NLS_LANG=american_america.utf8
[oracle@uhesse ~]$ export NLS_DATE_FORMAT='yyyy-mm-dd hh24:mi:ss'

[oracle@uhesse ~]$ sqlplus sys/oracle_4U@pdb2 as sysdba

SQL> select * from scott.dept;

DEPTNO DNAME      LOC
------ ---------- ----------
    10 ACCOUNTING NEW YORK
    20 RESEARCH   DALLAS
    30 SALES      CHICAGO
    40 OPERATIONS BOSTON

SQL> select sysdate from dual;

SYSDATE
-------------------
2016-09-27 15:06:08

SQL> drop user scott cascade;

User dropped.

The drop user stands for the logical error. Now to the PDB PITR:

SQL> alter pluggable database pdb2 close immediate;

Pluggable database altered.

SQL> exit
Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
[oracle@edvmr1p0 ~]$ rman target /
	

RMAN> run{set until time='2016-09-27 15:06:05';restore pluggable database pdb2;
          recover pluggable database pdb2 auxiliary destination '/home/oracle/';
          alter pluggable database pdb2 open resetlogs;}

executing command: SET until clause

Starting restore at 2016-09-27 15:09:38
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=279 device type=DISK

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 00012 to /u01/app/oracle/oradata/pdb2/system01.dbf
channel ORA_DISK_1: restoring datafile 00013 to /u01/app/oracle/oradata/pdb2/sysaux01.dbf
channel ORA_DISK_1: restoring datafile 00014 to /u01/app/oracle/oradata/pdb2/users01.dbf
channel ORA_DISK_1: reading from backup piece 

/u01/app/oracle/fast_recovery_area/CDB1/3D69FAB014BF7D48E0532A40CE0A8038/backupset/2016_09_27/o1_mf_nnndf_TAG20160927T101919_cynkyhtd_.bkp
channel ORA_DISK_1: piece 

handle=/u01/app/oracle/fast_recovery_area/CDB1/3D69FAB014BF7D48E0532A40CE0A8038/backupset/2016_09_27/o1_mf_nnndf_TAG20160927T101919_cynkyhtd_.b

kp tag=TAG20160927T101919
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:15
Finished restore at 2016-09-27 15:09:55

Starting recover at 2016-09-27 15:09:55
current log archived
using channel ORA_DISK_1
RMAN-05026: WARNING: presuming following set of tablespaces applies to specified Point-in-Time

List of tablespaces expected to have UNDO segments
Tablespace SYSTEM
Tablespace UNDOTBS1

Creating automatic instance, with SID='gkon'

initialization parameters used for automatic instance:
db_name=CDB1
db_unique_name=gkon_pitr_pdb2_CDB1
compatible=12.1.0.2.0
db_block_size=8192
db_files=200
diagnostic_dest=/u01/app/oracle
_system_trig_enabled=FALSE
sga_target=752M
processes=200
db_create_file_dest=/home/oracle/
log_archive_dest_1='location=/home/oracle/'
enable_pluggable_database=true
_clone_one_pdb_recovery=true
#No auxiliary parameter file used


starting up automatic instance CDB1

Oracle instance started

Total System Global Area     788529152 bytes

Fixed Size                     2929352 bytes
Variable Size                218107192 bytes
Database Buffers             562036736 bytes
Redo Buffers                   5455872 bytes
Automatic instance created

contents of Memory Script:
{
# set requested point in time
set until  time "2016-09-27 15:06:05";
# restore the controlfile
restore clone controlfile;

# mount the controlfile
sql clone 'alter database mount clone database';
}
executing Memory Script

executing command: SET until clause

Starting restore at 2016-09-27 15:10:10
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=165 device type=DISK

channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: restoring control file
channel ORA_AUX_DISK_1: reading from backup piece /u01/app/oracle/fast_recovery_area/CDB1/autobackup/2016_09_27/o1_mf_s_923661139_cynspmom_.bkp
channel ORA_AUX_DISK_1: piece handle=/u01/app/oracle/fast_recovery_area/CDB1/autobackup/2016_09_27/o1_mf_s_923661139_cynspmom_.bkp 

tag=TAG20160927T123219
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01
output file name=/home/oracle/CDB1/controlfile/o1_mf_cyo2ymfv_.ctl
Finished restore at 2016-09-27 15:10:12

sql statement: alter database mount clone database

contents of Memory Script:
{
# set requested point in time
set until  time "2016-09-27 15:06:05";
# switch to valid datafilecopies
switch clone datafile  12 to datafilecopy
 "/u01/app/oracle/oradata/pdb2/system01.dbf";
switch clone datafile  13 to datafilecopy
 "/u01/app/oracle/oradata/pdb2/sysaux01.dbf";
switch clone datafile  14 to datafilecopy
 "/u01/app/oracle/oradata/pdb2/users01.dbf";
# set destinations for recovery set and auxiliary set datafiles
set newname for clone datafile  1 to new;
set newname for clone datafile  4 to new;
set newname for clone datafile  3 to new;
set newname for clone datafile  6 to new;
# restore the tablespaces in the recovery set and the auxiliary set
restore clone datafile  1, 4, 3, 6;

switch clone datafile all;
}
executing Memory Script

executing command: SET until clause

datafile 12 switched to datafile copy
input datafile copy RECID=7 STAMP=923670618 file name=/u01/app/oracle/oradata/pdb2/system01.dbf

datafile 13 switched to datafile copy
input datafile copy RECID=8 STAMP=923670618 file name=/u01/app/oracle/oradata/pdb2/sysaux01.dbf

datafile 14 switched to datafile copy
input datafile copy RECID=9 STAMP=923670618 file name=/u01/app/oracle/oradata/pdb2/users01.dbf

executing command: SET NEWNAME

executing command: SET NEWNAME

executing command: SET NEWNAME

executing command: SET NEWNAME

Starting restore at 2016-09-27 15:10:17
using channel ORA_AUX_DISK_1

channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_AUX_DISK_1: restoring datafile 00001 to /home/oracle/CDB1/datafile/o1_mf_system_%u_.dbf
channel ORA_AUX_DISK_1: restoring datafile 00004 to /home/oracle/CDB1/datafile/o1_mf_undotbs1_%u_.dbf
channel ORA_AUX_DISK_1: restoring datafile 00003 to /home/oracle/CDB1/datafile/o1_mf_sysaux_%u_.dbf
channel ORA_AUX_DISK_1: restoring datafile 00006 to /home/oracle/CDB1/datafile/o1_mf_users_%u_.dbf
channel ORA_AUX_DISK_1: reading from backup piece 

/u01/app/oracle/fast_recovery_area/CDB1/backupset/2016_09_27/o1_mf_nnndf_TAG20160927T101919_cynkxps1_.bkp
channel ORA_AUX_DISK_1: piece handle=/u01/app/oracle/fast_recovery_area/CDB1/backupset/2016_09_27/o1_mf_nnndf_TAG20160927T101919_cynkxps1_.bkp 

tag=TAG20160927T101919
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:25
Finished restore at 2016-09-27 15:10:42

datafile 1 switched to datafile copy
input datafile copy RECID=14 STAMP=923670642 file name=/home/oracle/CDB1/datafile/o1_mf_system_cyo2yshr_.dbf
datafile 4 switched to datafile copy
input datafile copy RECID=15 STAMP=923670642 file name=/home/oracle/CDB1/datafile/o1_mf_undotbs1_cyo2ysjc_.dbf
datafile 3 switched to datafile copy
input datafile copy RECID=16 STAMP=923670642 file name=/home/oracle/CDB1/datafile/o1_mf_sysaux_cyo2ysj1_.dbf
datafile 6 switched to datafile copy
input datafile copy RECID=17 STAMP=923670642 file name=/home/oracle/CDB1/datafile/o1_mf_users_cyo2ysjr_.dbf

contents of Memory Script:
{
# set requested point in time
set until  time "2016-09-27 15:06:05";
# online the datafiles restored or switched
sql clone "alter database datafile  1 online";
sql clone "alter database datafile  4 online";
sql clone "alter database datafile  3 online";
sql clone 'PDB2' "alter database datafile
 12 online";
sql clone 'PDB2' "alter database datafile
 13 online";
sql clone 'PDB2' "alter database datafile
 14 online";
sql clone "alter database datafile  6 online";
# recover pdb
recover clone database tablespace  "SYSTEM", "UNDOTBS1", "SYSAUX", "USERS" pluggable database
 'PDB2'   delete archivelog;
sql clone 'alter database open read only';
plsql <<>>;
plsql <<>>;
# shutdown clone before import
shutdown clone abort
plsql <<  'PDB2');
end; >>>;
}
executing Memory Script

executing command: SET until clause

sql statement: alter database datafile  1 online

sql statement: alter database datafile  4 online

sql statement: alter database datafile  3 online

sql statement: alter database datafile  12 online

sql statement: alter database datafile  13 online

sql statement: alter database datafile  14 online

sql statement: alter database datafile  6 online

Starting recover at 2016-09-27 15:10:43
using channel ORA_AUX_DISK_1

starting media recovery

archived log for thread 1 with sequence 43 is already on disk as file 

/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_43_cynm4w09_.arc
archived log for thread 1 with sequence 44 is already on disk as file 

/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_44_cynmy3k9_.arc
archived log for thread 1 with sequence 45 is already on disk as file 

/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_45_cynn3bds_.arc
archived log for thread 1 with sequence 46 is already on disk as file 

/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_46_cynn3d80_.arc
archived log for thread 1 with sequence 47 is already on disk as file 

/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_47_cynn6341_.arc
archived log for thread 1 with sequence 48 is already on disk as file 

/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_48_cynrz3bw_.arc
archived log for thread 1 with sequence 49 is already on disk as file 

/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_49_cyo2y39z_.arc
archived log file name=/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_43_cynm4w09_.arc thread=1 sequence=43
archived log file name=/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_44_cynmy3k9_.arc thread=1 sequence=44
archived log file name=/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_45_cynn3bds_.arc thread=1 sequence=45
archived log file name=/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_46_cynn3d80_.arc thread=1 sequence=46
archived log file name=/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_47_cynn6341_.arc thread=1 sequence=47
archived log file name=/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_48_cynrz3bw_.arc thread=1 sequence=48
archived log file name=/u01/app/oracle/fast_recovery_area/CDB1/archivelog/2016_09_27/o1_mf_1_49_cyo2y39z_.arc thread=1 sequence=49
media recovery complete, elapsed time: 00:00:04
Finished recover at 2016-09-27 15:10:47

sql statement: alter database open read only



Oracle instance shut down


Removing automatic instance
Automatic instance removed
auxiliary instance file /home/oracle/CDB1/datafile/o1_mf_sysaux_cyo2ysj1_.dbf deleted
auxiliary instance file /home/oracle/CDB1/controlfile/o1_mf_cyo2ymfv_.ctl deleted
Finished recover at 2016-09-27 15:10:51

Statement processed

Now how is the state of affairs after the PDB PITR?

RMAN> exit

[oracle@uhesse ~]$ sqlplus sys/oracle_4U@pdb2 as sysdba

SQL*Plus: Release 12.1.0.2.0 Production on Tue Sep 27 15:19:45 2016

Copyright (c) 1982, 2014, Oracle.  All rights reserved.


Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options

SQL> select count(*) from scott.dept;

  COUNT(*)
----------
         4

SQL> select DB_INCARNATION#,PDB_INCARNATION#,INCARNATION_TIME from v$pdb_incarnation;

DB_INCARNATION# PDB_INCARNATION# INCARNATION_TIME
--------------- ---------------- -------------------
              2                2 2016-09-27 15:06:29
              2                0 2015-03-17 16:49:58

SQL> connect / as sysdba
Connected.
SQL> select sequence#,status from v$log;

 SEQUENCE# STATUS
---------- ------------------------------------------------
        49 INACTIVE
        50 CURRENT
        48 INACTIVE

SQL> select INCARNATION#,RESETLOGS_TIME from v$database_incarnation;

INCARNATION# RESETLOGS_TIME
------------ -------------------
           1 2014-07-07 05:38:47
           2 2015-03-17 16:49:58

The logical error inside pdb2 is undone! In spite of the RESETLOGS clause, the CDB stays in the same incarnation as before and the Online Logs are not initialized. The new view V$PDB_INCARNATION confirms the creation of a new incarnation for pdb2, though.
I took this from a live demonstration at my present Oracle Database 12c New Features class. It has been done with 12.1, where Flashback on the PDB layer is not available. Hope you find it useful🙂

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3 Comments

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