12cR2 Incrementally Updated Backups and dropped datafiles

We have just noticed a difference in behavior in 12cR2 with regards to image copies being marked as obsolete after the backup is updated past the drop of a datafile.
I won’t describe the feature itself, if necessary you can read up at oracle-base or the Oracle documentation.

First review output from the testcase on a 12.1 instance, note that after dropping the datafile, and updating the backup past this point, the datafile copy is marked as obsolete:

RMAN> show all;

RMAN configuration parameters for database with db_unique_name ADAPTEST are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'BASIC' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
CONFIGURE RMAN OUTPUT TO KEEP FOR 7 DAYS; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/snapcf_ADAPTEST.f'; # default

RMAN> create tablespace test datafile size 1m autoextend off;

Statement processed

RMAN> backup incremental level 1 for recover of copy with tag 'test_obsolete' database;

Starting backup at 2017-04-19 12:47:09
using channel ORA_DISK_1
no parent backup or copy of datafile 1 found
no parent backup or copy of datafile 3 found
no parent backup or copy of datafile 4 found
no parent backup or copy of datafile 6 found
no parent backup or copy of datafile 5 found
channel ORA_DISK_1: starting datafile copy
input datafile file number=00001 name=+DATAC1/ADAPTEST/DATAFILE/system.401.941128155
output file name=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/data_D-ADAPTEST_I-757536437_TS-SYSTEM_FNO-1_0hs2302d tag=TEST_OBSOLETE RECID=19 STAMP=941719632
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07
channel ORA_DISK_1: starting datafile copy
input datafile file number=00003 name=+DATAC1/ADAPTEST/DATAFILE/sysaux.397.941128123
output file name=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/data_D-ADAPTEST_I-757536437_TS-SYSAUX_FNO-3_0is2302k tag=TEST_OBSOLETE RECID=20 STAMP=941719639
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07
channel ORA_DISK_1: starting datafile copy
input datafile file number=00004 name=+DATAC1/ADAPTEST/DATAFILE/undotbs1.403.941128201
output file name=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/data_D-ADAPTEST_I-757536437_TS-UNDOTBS1_FNO-4_0js2302r tag=TEST_OBSOLETE RECID=21 STAMP=941719644
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:01
channel ORA_DISK_1: starting datafile copy
input datafile file number=00006 name=+DATAC1/ADAPTEST/DATAFILE/users.399.941128199
output file name=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/data_D-ADAPTEST_I-757536437_TS-USERS_FNO-6_0ks2302s tag=TEST_OBSOLETE RECID=22 STAMP=941719644
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:01
channel ORA_DISK_1: starting datafile copy
input datafile file number=00005 name=+DATAC1/ADAPTEST/DATAFILE/test.1051.941719625
output file name=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/data_D-ADAPTEST_I-757536437_TS-TEST_FNO-5_0ls2302t tag=TEST_OBSOLETE RECID=23 STAMP=941719645
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:01
Finished backup at 2017-04-19 12:47:26

Starting Control File and SPFILE Autobackup at 2017-04-19 12:47:26
piece handle=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/c-757536437-20170419-00 comment=NONE
Finished Control File and SPFILE Autobackup at 2017-04-19 12:47:27

RMAN> drop tablespace test including contents and datafiles;

Statement processed

RMAN> backup incremental level 1 for recover of copy with tag 'test_obsolete' database;

Starting backup at 2017-04-19 12:47:41
using channel ORA_DISK_1
channel ORA_DISK_1: starting incremental level 1 datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00001 name=+DATAC1/ADAPTEST/DATAFILE/system.401.941128155
input datafile file number=00003 name=+DATAC1/ADAPTEST/DATAFILE/sysaux.397.941128123
input datafile file number=00004 name=+DATAC1/ADAPTEST/DATAFILE/undotbs1.403.941128201
input datafile file number=00006 name=+DATAC1/ADAPTEST/DATAFILE/users.399.941128199
channel ORA_DISK_1: starting piece 1 at 2017-04-19 12:47:41
channel ORA_DISK_1: finished piece 1 at 2017-04-19 12:47:42
piece handle=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/0ns2303d_1_1 tag=TEST_OBSOLETE comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 2017-04-19 12:47:42

Starting Control File and SPFILE Autobackup at 2017-04-19 12:47:42
piece handle=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/c-757536437-20170419-01 comment=NONE
Finished Control File and SPFILE Autobackup at 2017-04-19 12:47:43

RMAN> recover copy of database with tag 'test_obsolete';

Starting recover at 2017-04-19 12:47:55
using channel ORA_DISK_1
channel ORA_DISK_1: starting incremental datafile backup set restore
channel ORA_DISK_1: specifying datafile copies to recover
recovering datafile copy file number=00001 name=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/data_D-ADAPTEST_I-757536437_TS-SYSTEM_FNO-1_0hs2302d
recovering datafile copy file number=00003 name=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/data_D-ADAPTEST_I-757536437_TS-SYSAUX_FNO-3_0is2302k
recovering datafile copy file number=00004 name=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/data_D-ADAPTEST_I-757536437_TS-UNDOTBS1_FNO-4_0js2302r
recovering datafile copy file number=00006 name=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/data_D-ADAPTEST_I-757536437_TS-USERS_FNO-6_0ks2302s
channel ORA_DISK_1: reading from backup piece /u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/0ns2303d_1_1
channel ORA_DISK_1: piece handle=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/0ns2303d_1_1 tag=TEST_OBSOLETE
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
Finished recover at 2017-04-19 12:47:56

Starting Control File and SPFILE Autobackup at 2017-04-19 12:47:56
piece handle=/u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/c-757536437-20170419-02 comment=NONE
Finished Control File and SPFILE Autobackup at 2017-04-19 12:47:57

RMAN> report obsolete;

RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 1
Report of obsolete backups and copies
Type                 Key    Completion Time    Filename/Handle
-------------------- ------ ------------------ --------------------
Datafile Copy        23     2017-04-19 12:47:25 /u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/data_D-ADAPTEST_I-757536437_TS-TEST_FNO-5_0ls2302t
Backup Set           7      2017-04-19 12:47:26
  Backup Piece       7      2017-04-19 12:47:26 /u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/c-757536437-20170419-00
Backup Set           8      2017-04-19 12:47:42
  Backup Piece       8      2017-04-19 12:47:42 /u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/0ns2303d_1_1
Backup Set           9      2017-04-19 12:47:42
  Backup Piece       9      2017-04-19 12:47:42 /u01/app/oracle/product/12.1.0.2/dbhome_2/dbs/c-757536437-20170419-01

Compare this with output from the same testcase on 12.2 instance, the datafile copy is not marked as obsolete:

RMAN> show all;

RMAN configuration parameters for database with db_unique_name PVJTEST are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON; # default
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'BASIC' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
CONFIGURE RMAN OUTPUT TO KEEP FOR 7 DAYS; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u01/app/oracle/product/12.2.0.1/dbhome/dbs/snapcf_PVJTEST.f'; # default

RMAN> create tablespace test datafile size 1m autoextend off;

Statement processed

RMAN> backup incremental level 1 for recover of copy with tag 'test_obsolete' database;

Starting backup at 19-APR-17
using channel ORA_DISK_1
no parent backup or copy of datafile 3 found
no parent backup or copy of datafile 1 found
no parent backup or copy of datafile 4 found
no parent backup or copy of datafile 7 found
no parent backup or copy of datafile 5 found
channel ORA_DISK_1: starting datafile copy
input datafile file number=00003 name=/u02/oradata/PVJTEST/sysaux01.dbf
output file name=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/data_D-PVJTEST_I-2122366327_TS-SYSAUX_FNO-3_0vs2304k tag=TEST_OBSOLETE RECID=36 STAMP=941719708
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:15
channel ORA_DISK_1: starting datafile copy
input datafile file number=00001 name=/u02/oradata/PVJTEST/system01.dbf
output file name=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/data_D-PVJTEST_I-2122366327_TS-SYSTEM_FNO-1_10s23053 tag=TEST_OBSOLETE RECID=37 STAMP=941719720
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07
channel ORA_DISK_1: starting datafile copy
input datafile file number=00004 name=/u02/oradata/PVJTEST/undotbs01.dbf
output file name=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/data_D-PVJTEST_I-2122366327_TS-UNDOTBS1_FNO-4_11s2305a tag=TEST_OBSOLETE RECID=38 STAMP=941719724
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:03
channel ORA_DISK_1: starting datafile copy
input datafile file number=00007 name=/u02/oradata/PVJTEST/users01.dbf
output file name=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/data_D-PVJTEST_I-2122366327_TS-USERS_FNO-7_12s2305d tag=TEST_OBSOLETE RECID=39 STAMP=941719726
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:01
channel ORA_DISK_1: starting datafile copy
input datafile file number=00005 name=/u02/oradata/PVJTEST/datafile/o1_mf_test_dhfv0gk3_.dbf
output file name=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/data_D-PVJTEST_I-2122366327_TS-TEST_FNO-5_13s2305f tag=TEST_OBSOLETE RECID=40 STAMP=941719727
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:01
Finished backup at 19-APR-17

Starting Control File and SPFILE Autobackup at 19-APR-17
piece handle=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/c-2122366327-20170419-0e comment=NONE
Finished Control File and SPFILE Autobackup at 19-APR-17

RMAN> drop tablespace test including contents and datafiles;

Statement processed

RMAN> backup incremental level 1 for recover of copy with tag 'test_obsolete' database;

Starting backup at 19-APR-17
using channel ORA_DISK_1
channel ORA_DISK_1: starting incremental level 1 datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00003 name=/u02/oradata/PVJTEST/sysaux01.dbf
input datafile file number=00001 name=/u02/oradata/PVJTEST/system01.dbf
input datafile file number=00004 name=/u02/oradata/PVJTEST/undotbs01.dbf
input datafile file number=00007 name=/u02/oradata/PVJTEST/users01.dbf
channel ORA_DISK_1: starting piece 1 at 19-APR-17
channel ORA_DISK_1: finished piece 1 at 19-APR-17
piece handle=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/15s2305t_1_1 tag=TEST_OBSOLETE comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:15
Finished backup at 19-APR-17

Starting Control File and SPFILE Autobackup at 19-APR-17
piece handle=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/c-2122366327-20170419-0f comment=NONE
Finished Control File and SPFILE Autobackup at 19-APR-17

RMAN> recover copy of database with tag 'test_obsolete';

Starting recover at 19-APR-17
using channel ORA_DISK_1
channel ORA_DISK_1: starting incremental datafile backup set restore
channel ORA_DISK_1: specifying datafile copies to recover
recovering datafile copy file number=00001 name=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/data_D-PVJTEST_I-2122366327_TS-SYSTEM_FNO-1_10s23053
recovering datafile copy file number=00003 name=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/data_D-PVJTEST_I-2122366327_TS-SYSAUX_FNO-3_0vs2304k
recovering datafile copy file number=00004 name=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/data_D-PVJTEST_I-2122366327_TS-UNDOTBS1_FNO-4_11s2305a
recovering datafile copy file number=00007 name=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/data_D-PVJTEST_I-2122366327_TS-USERS_FNO-7_12s2305d
channel ORA_DISK_1: reading from backup piece /u01/app/oracle/product/12.2.0.1/dbhome/dbs/15s2305t_1_1
channel ORA_DISK_1: piece handle=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/15s2305t_1_1 tag=TEST_OBSOLETE
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:02
Finished recover at 19-APR-17

Starting Control File and SPFILE Autobackup at 19-APR-17
piece handle=/u01/app/oracle/product/12.2.0.1/dbhome/dbs/c-2122366327-20170419-10 comment=NONE
Finished Control File and SPFILE Autobackup at 19-APR-17

RMAN> report obsolete;

RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 1
Report of obsolete backups and copies
Type                 Key    Completion Time    Filename/Handle
-------------------- ------ ------------------ --------------------
Backup Set           22     19-APR-17         
  Backup Piece       22     19-APR-17          /u01/app/oracle/product/12.2.0.1/dbhome/dbs/15s2305t_1_1

One thought on “12cR2 Incrementally Updated Backups and dropped datafiles

  1. Pingback: A Consolidated List of 12cR2 Issues | hkpatora

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