Need archives earlier than previous backup.
Hi Experts,
Here i want to share and to know the reason of one situation.
DB Version :10.2.0.4
OS Version: Linux
I'm preparing Standby database from RAC database(PRIMARY) ----> (STANDBY) on ASM.
I have taken backup of database on 25-DEC-2010
taken standby controlfile backup on 26-DEC-2010
i restore the database on 28-DEC-2010 and i found some archive gaps after staring MRP process.
I have archive retention of 6 days. so as per retention i have all the archives in primary.
But when i check alert log file, it was requesting for archive which was generated on *01-DEC-2010*... ]:) i have checked completion_time of archive from v$archived_log
I got some basic information. can anyone post your views...
Thanks
STANDBY:-
~~~~
SQL> select min(checkpoint_change#) from v$datafile;
MIN(CHECKPOINT_CHANGE#)
6053066844468
PRIMARY:-
~~~~~~
SQL> select first_change#,next_change# from v$archived_log where sequence# between 8998 and 9008;
FIRST_CHANGE# NEXT_CHANGE#
6052728491241 6052728594833
6052728594833 6052728720598
6052728720598 6052728880838
6052728880838 6052729025406
6052729025406 6052729207089
6052729207089 6052729339202
6052729339202 6052729509994
6052729509994 6052732075048
6052732075048 6052751377975
6052751377975 6052763669833
6052763669833 6052767026703
FIRST_CHANGE# NEXT_CHANGE#
6052840910461 6052847501485
6052847501485 6052857374219
6052857374219 6052857920410
6052857920410 6052858390970
6052858390970 6052898901735
6052898901735 6052899018444
6052899018444 6052906511296
6052906511296 6052926911168
6052926911168 6052947295154
6052947295154 6052947546651
6052947546651 6052949938434
FIRST_CHANGE# NEXT_CHANGE#
6052947546651 6052949938434
6052947546651 6052949938434
24 rows selected.
SQL>
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Key Thrd Seq S Low Time Name
29 1 8 A 29-10-2011 12:01:58 +HR/dbhr/archivelog/2011_10_31/thread_1_seq_8.399.766018837
30 1 9 A 31-10-2011 23:00:30 +HR/dbhr/archivelog/2011_11_03/thread_1_seq_9.409.766278025
31 1 10 A 03-11-2011 23:00:23 +HR/dbhr/archivelog/2011_11_04/thread_1_seq_10.391.766366105
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## Note above RMAN forcing archive current log, this archivelog generated will be usable only for previous backup.
## Is not my case... I don't have backup of database.
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input archive log thread=1 sequence=8 recid=29 stamp=766018840
input archive log thread=1 sequence=9 recid=30 stamp=766278027
input archive log thread=1 sequence=10 recid=31 stamp=766366111
input archive log thread=1 sequence=11 recid=32 stamp=766516067
input archive log thread=1 sequence=12 recid=33 stamp=766516350
input archive log thread=1 sequence=13 recid=34 stamp=766516521
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channel ORA_DISK_1: finished piece 1 at 06-11-2011 17:15:38
piece handle=+FRA/dbhr/backupset/2011_11_06/annnf0_tag20111106t171521_0.268.766516525 tag=TAG20111106T171521 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:16
channel ORA_DISK_1: deleting archive log(s)
archive log filename=+HR/dbhr/archivelog/2011_10_31/thread_1_seq_8.399.766018837 recid=29 stamp=766018840
archive log filename=+HR/dbhr/archivelog/2011_11_03/thread_1_seq_9.409.766278025 recid=30 stamp=766278027
archive log filename=+HR/dbhr/archivelog/2011_11_04/thread_1_seq_10.391.766366105 recid=31 stamp=766366111
archive log filename=+HR/dbhr/archivelog/2011_11_06/thread_1_seq_11.411.766516065 recid=32 stamp=766516067
archive log filename=+HR/dbhr/archivelog/2011_11_06/thread_1_seq_12.413.766516349 recid=33 stamp=766516350
archive log filename=+HR/dbhr/archivelog/2011_11_06/thread_1_seq_13.414.766516521 recid=34 stamp=766516521
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## RMAN finish backup of Archivelog and Start Backup of Database
## My backup start at "06-11-2011 17:15:38"
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using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00001 name=+HR/dbhr/datafile/system.386.765556627
input datafile fno=00003 name=+HR/dbhr/datafile/sysaux.396.765556627
input datafile fno=00002 name=+HR/dbhr/datafile/undotbs1.393.765556627
input datafile fno=00004 name=+HR/dbhr/datafile/users.397.765557979
input datafile fno=00005 name=+BFILES/dbhr/datafile/bfiles.257.765542997
channel ORA_DISK_1: starting piece 1 at 06-11-2011 17:15:39
channel ORA_DISK_1: finished piece 1 at 06-11-2011 17:16:03
piece handle=+FRA/dbhr/backupset/2011_11_06/nnndf0_tag20111106t171539_0.269.766516539 tag=TAG20111106T171539 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:24
Finished backup at 06-11-2011 17:16:03
## And finish at "06-11-2011 17:16:03", so I can recovery my database from this time.
## I will need archivelogs (transactions) which was generated during backup of database.
## Note during backup some blocks are copied others not. The SCN is inconsistent state.
## To make it consistent I need apply archivelog which have all transactions recorded.
## Starting another backup of archived log generated during backup.
Starting backup at 06-11-2011 17:16:04
## So automatically RMAN force another "checkpoint" after backup finished,
## forcing archive current log, because this archivelog have all transactions to bring database in a consistent state.
current log archived
using channel ORA_DISK_1
channel ORA_DISK_1: starting archive log backupset
channel ORA_DISK_1: specifying archive log(s) in backup set
input archive log thread=1 sequence=14 recid=35 stamp=766516564
channel ORA_DISK_1: starting piece 1 at 06-11-2011 17:16:05
channel ORA_DISK_1: finished piece 1 at 06-11-2011 17:16:06
piece handle=+FRA/dbhr/backupset/2011_11_06/annnf0_tag20111106t171604_0.272.766516565 tag=TAG20111106T171604 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:02
channel ORA_DISK_1: deleting archive log(s)
archive log filename=+HR/dbhr/archivelog/2011_11_06/thread_1_seq_14.414.766516565 recid=35 stamp=766516564
Finished backup at 06-11-2011 17:16:06
## Note: I can recover my database from time "06-11-2011 17:16:03" (finished backup full)
## until "06-11-2011 17:16:04" (last archivelog generated) that is my recover window in this scenary.
## Listing Backup I have:
## Archive Logs in backupset before backup full start - *BP Key: 40*
## Backup Full database in backupset - *BP Key: 41*
## Archive Logs in backupset after backup full stop - *BP Key: 42*
RMAN> list backup;
List of Backup Sets
===================
BS Key Size Device Type Elapsed Time Completion Time
40 196.73M DISK 00:00:15 06-11-2011 17:15:37
*BP Key: 40* Status: AVAILABLE Compressed: NO Tag: TAG20111106T171521
Piece Name: +FRA/dbhr/backupset/2011_11_06/annnf0_tag20111106t171521_0.268.766516525
List of Archived Logs in backup set 40
Thrd Seq Low SCN Low Time Next SCN Next Time
1 8 766216 29-10-2011 12:01:58 855033 31-10-2011 23:00:30
1 9 855033 31-10-2011 23:00:30 896458 03-11-2011 23:00:23
1 10 896458 03-11-2011 23:00:23 937172 04-11-2011 23:28:23
1 11 937172 04-11-2011 23:28:23 976938 05-11-2011 23:28:49
1 12 976938 05-11-2011 23:28:49 1023057 06-11-2011 17:12:28
1 13 1023057 06-11-2011 17:12:28 1023411 06-11-2011 17:15:21
BS Key Type LV Size Device Type Elapsed Time Completion Time
41 Full 565.66M DISK 00:00:18 06-11-2011 17:15:57
*BP Key: 41* Status: AVAILABLE Compressed: NO Tag: TAG20111106T171539
Piece Name: +FRA/dbhr/backupset/2011_11_06/nnndf0_tag20111106t171539_0.269.766516539
List of Datafiles in backup set 41
File LV Type Ckp SCN Ckp Time Name
1 Full 1023422 06-11-2011 17:15:39 +HR/dbhr/datafile/system.386.765556627
2 Full 1023422 06-11-2011 17:15:39 +HR/dbhr/datafile/undotbs1.393.765556627
3 Full 1023422 06-11-2011 17:15:39 +HR/dbhr/datafile/sysaux.396.765556627
4 Full 1023422 06-11-2011 17:15:39 +HR/dbhr/datafile/users.397.765557979
5 Full 1023422 06-11-2011 17:15:39 +BFILES/dbhr/datafile/bfiles.257.765542997
BS Key Size Device Type Elapsed Time Completion Time
42 3.00K DISK 00:00:02 06-11-2011 17:16:06
*BP Key: 42* Status: AVAILABLE Compressed: NO Tag: TAG20111106T171604
Piece Name: +FRA/dbhr/backupset/2011_11_06/annnf0_tag20111106t171604_0.272.766516565
List of Archived Logs in backup set 42
Thrd Seq Low SCN Low Time Next SCN Next Time
1 14 1023411 06-11-2011 17:15:21 1023433 06-11-2011 17:16:04
## Here make sense what I trying explain
## As I don't have backup of database before of my Last backup, all archivelogs generated before of my backup full is useless.
## Deleting what are obsolete in my env, RMAN choose backupset 40 (i.e all archived logs generated before my backup full)
RMAN> delete obsolete;
RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 1
using channel ORA_DISK_1
Deleting the following obsolete backups and copies:
Type Key Completion Time Filename/Handle
*Backup Set 40* 06-11-2011 17:15:37
Backup Piece 40 06-11-2011 17:15:37 +FRA/dbhr/backupset/2011_11_06/annnf0_tag20111106t171521_0.268.766516525
Do you really want to delete the above objects (enter YES or NO)? yes
deleted backup piece
backup piece handle=+FRA/dbhr/backupset/2011_11_06/annnf0_tag20111106t171521_0.268.766516525 recid=40 stamp=766516523
Deleted 1 objectsIn the above example, I could before starting the backup run "delete archivelog all" because they would not be needed, but to show the example I follow this unnecessary way. (backup archivelog and delete after)
Regards,
Levi Pereira
Edited by: Levi Pereira on Nov 7, 2011 1:02 AM -
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