2017/03/14

Flashback to Guaranteed Restore Points with Flashback Logging Disabled does not require redo logs.


As it appeared, flashback to Guaranteed Restore Points with Flashback Logging Disabled does not require redo logs.

Indeed, restore point is made during database is mounted, and it does not need any recovery.
Otherwise, Oracle issues an error:

RMAN> shutdown abort

Oracle instance shut down

RMAN> startup mount

connected to target database (not started)
Oracle instance started
database mounted

Total System Global Area     415236096 bytes

Fixed Size                     2924976 bytes
Variable Size                272633424 bytes
Database Buffers             134217728 bytes
Redo Buffers                   5459968 bytes

RMAN> create restore point rp3 guarantee flashback database;

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of sql statement command at 03/14/2017 18:39:38
ORA-38784: Cannot create restore point 'RP3'.
ORA-38714: Instance recovery required.


Here is an experiment. The state of my database before that was the following. There was a cold RMAN backup, several guaranteed restore points and some changes made between them also stored in archive redo logs.
During the experiment, I just created one more backup and deleted all obsolete files. All archived redo logs happened to be obsolete. At the and I'm still able to flashback to any guaranteed restore points.

RMAN> backup as compressed backupset database;

Starting backup at 14-MAR-17
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=21 device type=DISK
channel ORA_DISK_1: starting compressed full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00011 name=/u04/app/oracle/oradata/db12r102m/pdb1/example01.dbf
input datafile file number=00009 name=/u04/app/oracle/oradata/db12r102m/pdb1/sysaux01.dbf
input datafile file number=00008 name=/u04/app/oracle/oradata/db12r102m/pdb1/system01.dbf
input datafile file number=00010 name=/u04/app/oracle/oradata/db12r102m/pdb1/SAMPLE_SCHEMA_users01.dbf
channel ORA_DISK_1: starting piece 1 at 14-MAR-17
channel ORA_DISK_1: finished piece 1 at 14-MAR-17
piece handle=/u04/app/oracle/fast_recovery_area/DB12R102M/46C0EDA68AC32521E0530100007FF7AE/backupset/2017_03_14/o1_mf_nn                                                                                                          ndf_TAG20170314T175412_ddj4k4q6_.bkp tag=TAG20170314T175412 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:01:15
channel ORA_DISK_1: starting compressed full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00003 name=/u04/app/oracle/oradata/db12r102m/sysaux01.dbf
input datafile file number=00001 name=/u04/app/oracle/oradata/db12r102m/system01.dbf
input datafile file number=00004 name=/u04/app/oracle/oradata/db12r102m/undotbs01.dbf
input datafile file number=00006 name=/u04/app/oracle/oradata/db12r102m/users01.dbf
channel ORA_DISK_1: starting piece 1 at 14-MAR-17
channel ORA_DISK_1: finished piece 1 at 14-MAR-17
piece handle=/u04/app/oracle/fast_recovery_area/DB12R102M/backupset/2017_03_14/o1_mf_nnndf_TAG20170314T175412_ddj4mj0f_.                                                                                                          bkp tag=TAG20170314T175412 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:02:15
channel ORA_DISK_1: starting compressed full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00007 name=/u04/app/oracle/oradata/db12r102m/pdbseed/sysaux01.dbf
input datafile file number=00005 name=/u04/app/oracle/oradata/db12r102m/pdbseed/system01.dbf
channel ORA_DISK_1: starting piece 1 at 14-MAR-17
channel ORA_DISK_1: finished piece 1 at 14-MAR-17
piece handle=/u04/app/oracle/fast_recovery_area/DB12R102M/46C09FC3D5701FE6E0530100007F94C7/backupset/2017_03_14/o1_mf_nn                                                                                                          ndf_TAG20170314T175412_ddj4qq55_.bkp tag=TAG20170314T175412 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:55
Finished backup at 14-MAR-17

Starting Control File and SPFILE Autobackup at 14-MAR-17
piece handle=/u04/app/oracle/fast_recovery_area/DB12R102M/autobackup/2017_03_14/o1_mf_s_938627615_ddj4sj3c_.bkp comment=                                                                                                          NONE
Finished Control File and SPFILE Autobackup at 14-MAR-17


RMAN> delete obsolete redundancy 1;

using channel ORA_DISK_1
Deleting the following obsolete backups and copies:
Type                 Key    Completion Time    Filename/Handle
-------------------- ------ ------------------ --------------------
Backup Set           1      14-MAR-17
  Backup Piece       1      14-MAR-17          /u04/app/oracle/fast_recovery_area/DB12R102M/46C0EDA68AC32521E0530100007FF7AE/backupset/2017_03_14/o1_mf_nnndf_TAG20170314T174036_ddj3qod4_.bkp
Backup Set           2      14-MAR-17
  Backup Piece       2      14-MAR-17          /u04/app/oracle/fast_recovery_area/DB12R102M/backupset/2017_03_14/o1_mf_nnndf_TAG20170314T174036_ddj3vwsn_.bkp
Backup Set           3      14-MAR-17
  Backup Piece       3      14-MAR-17          /u04/app/oracle/fast_recovery_area/DB12R102M/46C09FC3D5701FE6E0530100007F94C7/backupset/2017_03_14/o1_mf_nnndf_TAG20170314T174036_ddj40qz5_.bkp
Archive Log          1      14-MAR-17          /u04/app/oracle/fast_recovery_area/DB12R102M/archivelog/2017_03_14/o1_mf_1_38_ddj4794g_.arc
Backup Set           4      14-MAR-17
  Backup Piece       4      14-MAR-17          /u04/app/oracle/fast_recovery_area/DB12R102M/autobackup/2017_03_14/o1_mf_s_938626762_ddj426rf_.bkp
Archive Log          2      14-MAR-17          /u04/app/oracle/fast_recovery_area/DB12R102M/archivelog/2017_03_14/o1_mf_1_39_ddj489c1_.arc
Archive Log          3      14-MAR-17          /u04/app/oracle/fast_recovery_area/DB12R102M/archivelog/2017_03_14/o1_mf_1_40_ddj4dr1h_.arc
Archive Log          4      14-MAR-17          /u04/app/oracle/fast_recovery_area/DB12R102M/archivelog/2017_03_14/o1_mf_1_40_ddj4gw4l_.arc
Archive Log          6      14-MAR-17          /u04/app/oracle/fast_recovery_area/DB12R102M/archivelog/2017_03_14/o1_mf_1_39_ddj4gwn1_.arc
Archive Log          5      14-MAR-17          /u04/app/oracle/fast_recovery_area/DB12R102M/archivelog/2017_03_14/o1_mf_1_41_ddj4gwft_.arc
Backup Set           5      14-MAR-17
  Backup Piece       5      14-MAR-17          /u04/app/oracle/fast_recovery_area/DB12R102M/autobackup/2017_03_14/o1_mf_s_938627596_ddj4hf1o_.bkp

Do you really want to delete the above objects (enter YES or NO)? y
...
Deleted 11 objects


RMAN> alter database open;

Statement processed

RMAN> list copy;

specification does not match any datafile copy in the repository
specification does not match any control file copy in the repository
specification does not match any archived log in the repository

RMAN> list backup;


List of Backup Sets
===================


BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
6       Full    189.07M    DISK        00:01:09     14-MAR-17
        BP Key: 6   Status: AVAILABLE  Compressed: YES  Tag: TAG20170314T175412
        Piece Name: /u04/app/oracle/fast_recovery_area/DB12R102M/46C0EDA68AC32521E0530100007FF7AE/backupset/2017_03_14/o1_mf_nnndf_TAG20170314T175412_ddj4k4q6_.bkp
  List of Datafiles in backup set 6
  Container ID: 3, PDB Name: PDB1
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  8       Full 2137619    14-MAR-17 /u04/app/oracle/oradata/db12r102m/pdb1/system01.dbf
  9       Full 2137619    14-MAR-17 /u04/app/oracle/oradata/db12r102m/pdb1/sysaux01.dbf
  10      Full 2137619    14-MAR-17 /u04/app/oracle/oradata/db12r102m/pdb1/SAMPLE_SCHEMA_users01.dbf
  11      Full 2137619    14-MAR-17 /u04/app/oracle/oradata/db12r102m/pdb1/example01.dbf

BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
7       Full    405.53M    DISK        00:02:11     14-MAR-17
        BP Key: 7   Status: AVAILABLE  Compressed: YES  Tag: TAG20170314T175412
        Piece Name: /u04/app/oracle/fast_recovery_area/DB12R102M/backupset/2017_03_14/o1_mf_nnndf_TAG20170314T175412_ddj4mj0f_.bkp
  List of Datafiles in backup set 7
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  1       Full 2137631    14-MAR-17 /u04/app/oracle/oradata/db12r102m/system01.dbf
  3       Full 2137631    14-MAR-17 /u04/app/oracle/oradata/db12r102m/sysaux01.dbf
  4       Full 2137631    14-MAR-17 /u04/app/oracle/oradata/db12r102m/undotbs01.dbf
  6       Full 2137631    14-MAR-17 /u04/app/oracle/oradata/db12r102m/users01.dbf

BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
8       Full    157.07M    DISK        00:00:44     14-MAR-17
        BP Key: 8   Status: AVAILABLE  Compressed: YES  Tag: TAG20170314T175412
        Piece Name: /u04/app/oracle/fast_recovery_area/DB12R102M/46C09FC3D5701FE6E0530100007F94C7/backupset/2017_03_14/o1_mf_nnndf_TAG20170314T175412_ddj4qq55_.bkp
  List of Datafiles in backup set 8
  Container ID: 2, PDB Name: PDB$SEED
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  5       Full 1824920    23-JAN-17 /u04/app/oracle/oradata/db12r102m/pdbseed/system01.dbf
  7       Full 1824920    23-JAN-17 /u04/app/oracle/oradata/db12r102m/pdbseed/sysaux01.dbf

BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
9       Full    17.20M     DISK        00:00:02     14-MAR-17
        BP Key: 9   Status: AVAILABLE  Compressed: NO  Tag: TAG20170314T175838
        Piece Name: /u04/app/oracle/fast_recovery_area/DB12R102M/autobackup/2017_03_14/o1_mf_s_938627615_ddj4sj3c_.bkp
  SPFILE Included: Modification time: 10-MAR-17
  SPFILE db_unique_name: DB12R102M
  Control File Included: Ckp SCN: 2137631      Ckp time: 14-MAR-17

RMAN> shutdown immediate

using target database control file instead of recovery catalog
database closed
database dismounted
Oracle instance shut down

RMAN> startup mount

connected to target database (not started)
Oracle instance started
database mounted

Total System Global Area     415236096 bytes

Fixed Size                     2924976 bytes
Variable Size                272633424 bytes
Database Buffers             134217728 bytes
Redo Buffers                   5459968 bytes

RMAN> flashback database to restore point rp2;

Starting flashback at 14-MAR-17
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=21 device type=DISK


starting media recovery
media recovery complete, elapsed time: 00:00:03

Finished flashback at 14-MAR-17

RMAN> alter database open resetlogs;

Statement processed

RMAN>

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