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13 June, 2015

RMAN -- 2 : ArchiveLog Deletion Policy

Most Internet references about defining the ArchiveLog Deletion Policy relate to the necessity to preserve ArchiveLogs for Standby databases.

For example, the configuration here prevents deletion unless an ArchiveLog has been applied on a Standby :

RMAN> show all;

RMAN configuration parameters for database with db_unique_name ORCL are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
CONFIGURE BACKUP OPTIMIZATION OFF; # default
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 2 BACKUP TYPE TO BACKUPSET;
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 ARCHIVELOG DELETION POLICY TO APPLIED ON ALL STANDBY;
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/home/oracle/app/oracle/product/11.2.0/dbhome_2/dbs/snapcf_orcl.f'; # default

RMAN> 

But it is possible to also configure it differently. For example, thus for a database without a Standby, I can configure it to prevent deletion unless a Backup of the ArchiveLog has been made (to disk in this case)  :

RMAN> configure archivelog deletion policy to backed up 1 times to device type disk;

old RMAN configuration parameters:
CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON ALL STANDBY;
new RMAN configuration parameters:
CONFIGURE ARCHIVELOG DELETION POLICY TO BACKED UP 1 TIMES TO DISK;
new RMAN configuration parameters are successfully stored

RMAN> show all;

RMAN configuration parameters for database with db_unique_name ORCL are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
CONFIGURE BACKUP OPTIMIZATION OFF; # default
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 2 BACKUP TYPE TO BACKUPSET;
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 ARCHIVELOG DELETION POLICY TO BACKED UP 1 TIMES TO DISK;
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/home/oracle/app/oracle/product/11.2.0/dbhome_2/dbs/snapcf_orcl.f'; # default

RMAN> 

Let's see how this plays.
RMAN> sql 'alter system archive log current ';

sql statement: alter system archive log current 

RMAN> delete archivelog all;

released channel: ORA_DISK_1
released channel: ORA_DISK_2
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=35 device type=DISK
allocated channel: ORA_DISK_2
channel ORA_DISK_2: SID=52 device type=DISK
RMAN-08138: WARNING: archived log not deleted - must create more backups
archived log file name=/NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_623_bqrjp5gx_.arc thread=1 sequence=623
RMAN-08138: WARNING: archived log not deleted - must create more backups
archived log file name=/NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_624_bqrjpsb3_.arc thread=1 sequence=624
RMAN-08138: WARNING: archived log not deleted - must create more backups
archived log file name=/NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_625_bqrjq8kj_.arc thread=1 sequence=625
RMAN-08138: WARNING: archived log not deleted - must create more backups
archived log file name=/NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_626_bqrjqfdq_.arc thread=1 sequence=626

RMAN> 

RMAN raised a WARNING that indicates that deletion of the ArchiveLog is not permitted until a Backup has been taken.  Thus, you can protect your ArchiveLogs from deletion by RMAN commands if they have not been backed up.
NOTE : This does NOT prevent non-RMAN commands (e.g. cron jobs with shell scripts) from deleting ArchiveLogs !

Let me backup and then delete the ArchiveLogs.

RMAN> backup as compressed backupset archivelog all;

Starting backup at 13-JUN-15
current log archived
using channel ORA_DISK_1
using channel ORA_DISK_2
channel ORA_DISK_1: starting compressed archived log backup set
channel ORA_DISK_1: specifying archived log(s) in backup set
input archived log thread=1 sequence=623 RECID=9 STAMP=882312517
channel ORA_DISK_1: starting piece 1 at 13-JUN-15
channel ORA_DISK_2: starting compressed archived log backup set
channel ORA_DISK_2: specifying archived log(s) in backup set
input archived log thread=1 sequence=624 RECID=10 STAMP=882312537
input archived log thread=1 sequence=625 RECID=11 STAMP=882312552
input archived log thread=1 sequence=626 RECID=12 STAMP=882312557
channel ORA_DISK_2: starting piece 1 at 13-JUN-15
channel ORA_DISK_1: finished piece 1 at 13-JUN-15
piece handle=/NEW_FS/oracle/FRA/ORCL/backupset/2015_06_13/o1_mf_annnn_TAG20150613T225210_bqrjwtfd_.bkp tag=TAG20150613T225210 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
channel ORA_DISK_1: starting compressed archived log backup set
channel ORA_DISK_1: specifying archived log(s) in backup set
input archived log thread=1 sequence=627 RECID=13 STAMP=882312730
channel ORA_DISK_1: starting piece 1 at 13-JUN-15
channel ORA_DISK_2: finished piece 1 at 13-JUN-15
piece handle=/NEW_FS/oracle/FRA/ORCL/backupset/2015_06_13/o1_mf_annnn_TAG20150613T225210_bqrjwtg3_.bkp tag=TAG20150613T225210 comment=NONE
channel ORA_DISK_2: backup set complete, elapsed time: 00:00:01
channel ORA_DISK_1: finished piece 1 at 13-JUN-15
piece handle=/NEW_FS/oracle/FRA/ORCL/backupset/2015_06_13/o1_mf_annnn_TAG20150613T225210_bqrjwvp1_.bkp tag=TAG20150613T225210 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 13-JUN-15

Starting Control File and SPFILE Autobackup at 13-JUN-15
piece handle=/NEW_FS/oracle/FRA/ORCL/autobackup/2015_06_13/o1_mf_s_882312732_bqrjwwsc_.bkp comment=NONE
Finished Control File and SPFILE Autobackup at 13-JUN-15

RMAN> delete archivelog all;

released channel: ORA_DISK_1
released channel: ORA_DISK_2
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=35 device type=DISK
allocated channel: ORA_DISK_2
channel ORA_DISK_2: SID=52 device type=DISK
List of Archived Log Copies for database with db_unique_name ORCL
=====================================================================

Key     Thrd Seq     S Low Time 
------- ---- ------- - ---------
9       1    623     A 07-JUN-15
        Name: /NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_623_bqrjp5gx_.arc

10      1    624     A 13-JUN-15
        Name: /NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_624_bqrjpsb3_.arc

11      1    625     A 13-JUN-15
        Name: /NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_625_bqrjq8kj_.arc

12      1    626     A 13-JUN-15
        Name: /NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_626_bqrjqfdq_.arc

13      1    627     A 13-JUN-15
        Name: /NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_627_bqrjwt3k_.arc


Do you really want to delete the above objects (enter YES or NO)? YES
deleted archived log
archived log file name=/NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_623_bqrjp5gx_.arc RECID=9 STAMP=882312517
deleted archived log
archived log file name=/NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_624_bqrjpsb3_.arc RECID=10 STAMP=882312537
deleted archived log
archived log file name=/NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_625_bqrjq8kj_.arc RECID=11 STAMP=882312552
deleted archived log
archived log file name=/NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_626_bqrjqfdq_.arc RECID=12 STAMP=882312557
deleted archived log
archived log file name=/NEW_FS/oracle/FRA/ORCL/archivelog/2015_06_13/o1_mf_1_627_bqrjwt3k_.arc RECID=13 STAMP=882312730
Deleted 5 objects


RMAN> 

Now, I am able to delete the ArchiveLogs as I have at least 1 backup (on disk) of each.

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4 comments:

Santy said...

Good one
How abt retention policy required by replication software like golden gate

Hemant K Chitale said...

You'd have to ensure that there is enough space for Oracle to retain enough ArchiveLogs for GoldenGate and not automatically purge them.

Kuba said...

...or you can set alternative archivelog destination in goldengate with altarchivelogdest parameter and by coping(with manualy or with script) archivelogs before deletion policy occurs to this alternative location.

Kuba said...

...or you can set altarchivelogdest parameter in GoldenGate as your secondary archivelog location and by manually/automatically copy archivelogs to this location.

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