RMAN bypass backup can be taken from question?

Hi all

pretty simple question (I hope that ):

I use the suite at the moment for example:

run
{
Backup CONFIGURATION DEVICE TYPE DISK PARALLELISM 2 to compressed backupset;
TIME 01:00 PARTIAL minimize THE time data BACKUP FILESPERSET 1;
}

But I was wondering if there is some way to this running as a backup script planned to restart backup, if it does not (due to problems of space file etc.)

run
{

Configure the disk channel CH1 device type format ' / alternate/path/for_backup/%d_DB_%M%D%Y_%p_%s_%U';
Configure the disk channel CH2 device type format ' / alternate/path/for_backup/%d_DB_%M%D%Y_%p_%s_%U';


TIME 01:00 PARTIAL minimize THE time of BACKUP data
NOT BACKED UP SINCE TIME ' SYSDATE - 1' fileperset 1;    < < < I know it won't work like that but y at - it another way to accomplish this? (work around to restart the backup time and the option to reduce time?)


cleaning etc release channels

}

PS: question side bonus points

who can tell me more about the loss of speed MB/S compared to the rate of compression: low/medium/high?

I hope that there are some brilliant minds out there willing to help!

Thanks in advance.



The themes you mention seem to be covered in the Advanced documentation of RMAN:

http://docs.Oracle.com/CD/E11882_01/backup.112/e10642/rcmbckad.htm#BRADV89540

I don't know if anyone can really give you an opinion about which compression will have the best size vs time full report. But the next test by using a simple vanilla ORCL database shows the result of the compression of 'low '. It was done on sub Oracle 11 GR 2 one running a VirtualBox VM. As you can see there is a reduction of the large size of the backupset, which however has taken so long to complete as to the 'no' compression.

RMAN> CONFIGURE COMPRESSION ALGORITHM clear;

RMAN> backup database;
RMAN> list backup;

BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
40      Full    1.20G      DISK        00:00:08     22-JUN-15
        BP Key: 40   Status: AVAILABLE  Compressed: NO  Tag: TAG20150622T123329

RMAN> CONFIGURE COMPRESSION ALGORITHM 'LOW';
RMAN> backup as compressed backupset database;
RMAN> list backup;

BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
44      Full    400.38M    DISK        00:00:08     22-JUN-15
        BP Key: 44   Status: AVAILABLE  Compressed: YES  Tag: TAG20150622T123811

Why did you write that I know that it won't work like that? According to the example below, I don't see the problem. As you can see on the 2nd run of the backup command, it ignores the data files that he has previously treated.

RMAN> BACKUP DURATION 1:00 PARTIAL MINIMIZE TIME database NOT BACKED UP SINCE TIME 'SYSDATE -1' FILESPERSET 1;

Starting backup at 22-JUN-15
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00001 name=+DATA/orcl1/datafile/system.256.862871041
channel ORA_DISK_1: starting piece 1 at 22-JUN-15
channel ORA_DISK_1: finished piece 1 at 22-JUN-15
piece handle=+DATA/orcl1/backupset/2015_06_22/nnndf0_tag20150622t121929_0.283.883052369 tag=TAG20150622T121929 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00005 name=+DATA/orcl1/datafile/example.269.862871121
channel ORA_DISK_1: starting piece 1 at 22-JUN-15
channel ORA_DISK_1: finished piece 1 at 22-JUN-15
piece handle=+DATA/orcl1/backupset/2015_06_22/nnndf0_tag20150622t121929_0.275.883052373 tag=TAG20150622T121929 comment=NONE
...etc...

RMAN> delete backupset 29,30,34;

RMAN> BACKUP DURATION 1:00 PARTIAL MINIMIZE TIME database NOT BACKED UP SINCE TIME 'SYSDATE -1' FILESPERSET 1;

Starting backup at 22-JUN-15
using channel ORA_DISK_1
skipping datafile 2; already backed up on 22-JUN-15
skipping datafile 3; already backed up on 22-JUN-15
skipping datafile 4; already backed up on 22-JUN-15
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00001 name=+DATA/orcl1/datafile/system.256.862871041
channel ORA_DISK_1: starting piece 1 at 22-JUN-15
channel ORA_DISK_1: finished piece 1 at 22-JUN-15
piece handle=+DATA/orcl1/backupset/2015_06_22/nnndf0_tag20150622t122021_0.308.883052421 tag=TAG20150622T122021 comment=NONE
...etc...

Tags: Database

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    93      B  F  A DISK        20-JAN-16       1       1       NO         TAG20160120T080545
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    97      B  F  A DISK        20-JAN-16       1       1       NO         TAG20160120T080657
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    105     B  F  A DISK        20-JAN-16       1       1       NO         TAG20160120T080844
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    107     B  1  A DISK        20-JAN-16       1       1       YES        DB_INC
    108     B  A  A DISK        20-JAN-16       1       1       YES        ARCL_BKP_INC

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    allocated channel: ORA_DISK_2
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    using channel ORA_DISK_2
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    RMAN-00571: ===========================================================
    RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
    RMAN-00571: ===========================================================
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            BP Key: 82   Status: AVAILABLE  Compressed: YES  Tag: ARCL_BKP_FULL
            Piece Name: /u01/backup/DB_FULL_ORCL_20160120_s91_p1

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    1    1       1154833    20-JAN-16 1177422    20-JAN-16

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            BP Key: 83   Status: AVAILABLE  Compressed: YES  Tag: ARCL_BKP_FULL
            Piece Name: /u01/backup/DB_FULL_ORCL_20160120_s92_p1

      List of Archived Logs in backup set 83
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    1    1       1162729    20-JAN-16 1188784    20-JAN-16

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      List of Archived Logs in backup set 84
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      ---- ------- ---------- --------- ---------- ---------
      1    2       1177422    20-JAN-16 1201833    20-JAN-16

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    88      1.81M      DISK        00:00:01     20-JAN-16     
            BP Key: 88   Status: AVAILABLE  Compressed: YES  Tag: ARCL_BKP_INC
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      List of Archived Logs in backup set 88
      Thrd Seq     Low SCN    Low Time  Next SCN   Next Time
      ---- ------- ---------- --------- ---------- ---------
      1    3       1201833    20-JAN-16 1204844    20-JAN-16
      1    4       1204844    20-JAN-16 1204893    20-JAN-16
      1    5       1204893    20-JAN-16 1204958    20-JAN-16

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    92      143.00K    DISK        00:00:00     20-JAN-16     
            BP Key: 92   Status: AVAILABLE  Compressed: YES  Tag: ARCL_BKP_INC
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      List of Archived Logs in backup set 92
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      ---- ------- ---------- --------- ---------- ---------
      1    6       1204958    20-JAN-16 1205034    20-JAN-16
      1    7       1205034    20-JAN-16 1205253    20-JAN-16

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            BP Key: 96   Status: AVAILABLE  Compressed: YES  Tag: ARCL_BKP_INC
            Piece Name: /u01/backup/DB_INC_ORCL_20160120_s105_p1

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      1    8       1205253    20-JAN-16 1205354    20-JAN-16
      1    9       1205354    20-JAN-16 1205433    20-JAN-16

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      List of Archived Logs in backup set 100
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      ---- ------- ---------- --------- ---------- ---------
      1    10      1205433    20-JAN-16 1205519    20-JAN-16
      1    11      1205519    20-JAN-16 1205559    20-JAN-16

    BS Key  Size       Device Type Elapsed Time Completion Time
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    104     128.00K    DISK        00:00:00     20-JAN-16     
            BP Key: 104   Status: AVAILABLE  Compressed: YES  Tag: ARCL_BKP_INC
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      List of Archived Logs in backup set 104
      Thrd Seq     Low SCN    Low Time  Next SCN   Next Time
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      1    12      1205559    20-JAN-16 1205624    20-JAN-16
      1    13      1205624    20-JAN-16 1205739    20-JAN-16

    BS Key  Size       Device Type Elapsed Time Completion Time
    ------- ---------- ----------- ------------ ---------------
    108     8.00K      DISK        00:00:00     20-JAN-16     
            BP Key: 108   Status: AVAILABLE  Compressed: YES  Tag: ARCL_BKP_INC
            Piece Name: /u01/backup/DB_INC_ORCL_20160120_s117_p1

      List of Archived Logs in backup set 108
      Thrd Seq     Low SCN    Low Time  Next SCN   Next Time
      ---- ------- ---------- --------- ---------- ---------
      1    14      1205739    20-JAN-16 1205796    20-JAN-16
      1    15      1205796    20-JAN-16 1205840    20-JAN-16


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