One thing I just noticed is that BACKUP OPTIMIZATION is on. Is that still
not always as optimal as the name suggests? It's one of those items I've
always disabled because of the seemingly unpredictable performance on any
given backup.
Just a thought...
Rich
On Mon, Feb 24, 2020 at 12:15 PM Leng <lkaing@xxxxxxxxx> wrote:
The Rman backup log itself isn’t showing a compressed backup. So
compression shouldn’t be the problem here.
There are in fact 4 channels rather than 2. So you’ll need to experiment
with the number of channels - more isn’t always better. If backups are
impacting performance you may also need to consider throttling the backup
rather than throwing more channels at it.
And yes get faster disks for the backup if you can. eg. Compare a single
backup to /oracle vs /backup_new
Cheers,
Leng
On 25 Feb 2020, at 4:23 am, Jeffrey Beckstrom <jbeckstrom@xxxxxxxxx>
wrote:
If SAP is doing begin/end backup, then it would not be using RMAN nor
doing a compressed backup. Your RMAN is doing a compressed backup so that
would use additional CPU resources.
Thanks everyone for you suggestions and comments. I can tell you they areSandra Becker <sbecker6925@xxxxxxxxx> 2/24/20 12:13 PM >>>
definitely using the version 7 style of backup where they "alter tablespace
<tablespace_name> begin backup".
Here are the RMAN configuration and backup script they are using. I'm
trying to see if they still have the rman backup log from their last
attempt.
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 4 DAYS;
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP OFF;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; #
default
CONFIGURE DEVICE TYPE DISK PARALLELISM 3 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;
CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT
"/backup_new/Backups/dgcs064/DB01/rman/full_ol_%t_s%s_s%p";
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'MEDIUM' AS OF RELEASE 'DEFAULT' OPTIMIZE
FOR LOAD TRUE;
CONFIGURE ARCHIVELOG DELETION POLICY TO BACKED UP 1 TIMES TO DISK;
CONFIGURE SNAPSHOT CONTROLFILE NAME TO
'/oracle/DB01/112_64/dbs/snapcf_DB01.f'; # default
RUN
{
set command id to 'ORCLOnlineBackupFull';
ALLOCATE CHANNEL c1 DEVICE TYPE disk;
ALLOCATE CHANNEL c2 DEVICE TYPE disk;
ALLOCATE CHANNEL c3 DEVICE TYPE disk;
ALLOCATE CHANNEL c4 DEVICE TYPE disk;
backup AS BACKUPSET full database tag ORCL_FULL format
'/backup_new/XXX_SAP_Backups/XXX/rman/XXX_%d_%T_%s_%p_FULL
' plus archivelog ;
backup tag ORCL_CONTROL current controlfile format
'/backup_new/XXX_Backups/XXX/rman/%d_%T_%s_%p_CONTROL'
;
DELETE NOPROMPT OBSOLETE;
release channel c1;
release channel c2;
release channel c3;
release channel c4;
}
Backup log:
----------------------------------------------------------------------
Running: online_backup_disk.ksh on xxxxxxxxxxxxx
AS: oraXXX
At: 20:00:02 on 02/15/2020
backup processes = 0
Starting RMAN...
Recovery Manager: Release 11.2.0.4.0 - Production on Sat Feb 15 20:00:02
2020
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights
reserved.
connected to target database: XXX (DBID=3807154456)
connected to recovery catalog database
RMAN> RUN
2> {
3> set command id to 'ORCLOnlineBackupFull';
4> ALLOCATE CHANNEL c1 DEVICE TYPE disk;
5> ALLOCATE CHANNEL c2 DEVICE TYPE disk;
6> ALLOCATE CHANNEL c3 DEVICE TYPE disk;
7> ALLOCATE CHANNEL c4 DEVICE TYPE disk;
8> backup AS BACKUPSET full database tag ORCL_FULL format
'/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/%d_%T_%s_%p_FU LL' plus
archivelog ;
9> backup tag ORCL_CONTROL current controlfile format
'/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/%d_%T_%s_%p_CONTRO L';
10> DELETE NOPROMPT OBSOLETE;
11> release channel c1;
12> release channel c2;
13> release channel c3;
14> release channel c4;
15>
16> }
17>
executing command: SET COMMAND ID
allocated channel: c1
channel c1: SID=21 device type=DISK
allocated channel: c2
channel c2: SID=85 device type=DISK
allocated channel: c3
channel c3: SID=15 device type=DISK
allocated channel: c4
channel c4: SID=51 device type=DISK
Starting backup at 15-FEB-20
current log archived
channel c1: starting archived log backup set
channel c1: specifying archived log(s) in backup set
input archived log thread=1 sequence=37962 RECID=18943 STAMP=1032307471
input archived log thread=1 sequence=37963 RECID=18944 STAMP=1032327553
input archived log thread=1 sequence=37964 RECID=18945 STAMP=1032355400
channel c1: starting piece 1 at 15-FEB-20
channel c2: starting archived log backup set
channel c2: specifying archived log(s) in backup set
input archived log thread=1 sequence=37965 RECID=18946 STAMP=1032382820
input archived log thread=1 sequence=37966 RECID=18947 STAMP=1032393884
input archived log thread=1 sequence=37967 RECID=18948 STAMP=1032415345
channel c2: starting piece 1 at 15-FEB-20
channel c3: starting archived log backup set
channel c3: specifying archived log(s) in backup set
input archived log thread=1 sequence=37968 RECID=18949 STAMP=1032420919
input archived log thread=1 sequence=37969 RECID=18950 STAMP=1032426942
input archived log thread=1 sequence=37970 RECID=18951 STAMP=1032433588
channel c3: starting piece 1 at 15-FEB-20
channel c4: starting archived log backup set
channel c4: specifying archived log(s) in backup set
input archived log thread=1 sequence=37971 RECID=18952 STAMP=1032438208
input archived log thread=1 sequence=37972 RECID=18953 STAMP=1032458451
input archived log thread=1 sequence=37973 RECID=18954 STAMP=1032466012
channel c4: starting piece 1 at 15-FEB-20
channel c1: finished piece 1 at 15-FEB-20
piece
handle=/oracle/XXX/oraflash/XXX/backupset/2020_02_15/o1_mf_annnn_TAG20200215T200656_h4jmv1t3_.bkp
tag=TAG20200215T 200656 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:10
channel c2: finished piece 1 at 15-FEB-20
piece
handle=/oracle/XXX/oraflash/XXX/backupset/2020_02_15/o1_mf_annnn_TAG20200215T200656_h4jmv1vz_.bkp
tag=TAG20200215T 200656 comment=NONE
channel c2: backup set complete, elapsed time: 00:00:10
channel c3: finished piece 1 at 15-FEB-20
piece
handle=/oracle/XXX/oraflash/XXX/backupset/2020_02_15/o1_mf_annnn_TAG20200215T200656_h4jmv2lp_.bkp
tag=TAG20200215T 200656 comment=NONE
channel c3: backup set complete, elapsed time: 00:00:09
channel c4: finished piece 1 at 15-FEB-20
piece
handle=/oracle/XXX/oraflash/XXX/backupset/2020_02_15/o1_mf_annnn_TAG20200215T200656_h4jmv4w5_.bkp
tag=TAG20200215T 200656 comment=NONE
channel c4: backup set complete, elapsed time: 00:00:07
Finished backup at 15-FEB-20
Starting backup at 15-FEB-20
channel c1: starting full datafile backup set
channel c1: specifying datafile(s) in backup set
input datafile file number=00008 name=/oracle/XXX/yyyyyyy5/sr3_5/sr3.data5
input datafile file number=00025
name=/oracle/XXX/yyyyyyy2/sr3700_1/sr3700.data1
input datafile file number=00034
name=/oracle/XXX/yyyyyyy4/sr3_25/sr3.data25
input datafile file number=00002
name=/oracle/XXX/yyyyyyy1/sysaux_1/sysaux.data1
input datafile file number=00003
name=/oracle/XXX/yyyyyyy1/undo_1/undo.data1
input datafile file number=00001
name=/oracle/XXX/yyyyyyy1/system_1/system.data1
input datafile file number=00037
name=/oracle/XXX/yyyyyyy1/system_2/system.data2
input datafile file number=00015
name=/oracle/XXX/yyyyyyy2/sr3_12/sr3.data12
channel c1: starting piece 1 at 15-FEB-20
channel c2: starting full datafile backup set
channel c2: specifying datafile(s) in backup set
input datafile file number=00035
name=/oracle/XXX/yyyyyyy5/sr3_26/sr3.data26
input datafile file number=00031
name=/oracle/XXX/yyyyyyy3/sr3_22/sr3.data22
input datafile file number=00029
name=/oracle/XXX/yyyyyyy2/sr3usr_1/sr3usr.data1
input datafile file number=00026
name=/oracle/XXX/yyyyyyy2/sr3700_2/sr3700.data2
input datafile file number=00030
name=/oracle/XXX/yyyyyyy2/vertex/vertex.data1
input datafile file number=00027
name=/oracle/XXX/yyyyyyy2/sr3fact_1/sr3fact.data1
input datafile file number=00028
name=/oracle/XXX/yyyyyyy2/sr3ods_1/sr3ods.data1
input datafile file number=00036
name=/oracle/XXX/yyyyyyy5/sr3_27/sr3.data27
input datafile file number=00032
name=/oracle/XXX/yyyyyyy5/sr3_23/sr3.data23
input datafile file number=00033
name=/oracle/XXX/yyyyyyy5/sr3_24/sr3.data24
channel c2: starting piece 1 at 15-FEB-20
channel c3: starting full datafile backup set
channel c3: specifying datafile(s) in backup set
input datafile file number=00013
name=/oracle/XXX/yyyyyyy5/sr3_10/sr3.data10
input datafile file number=00004 name=/oracle/XXX/yyyyyyy1/sr3_1/sr3.data1
input datafile file number=00005 name=/oracle/XXX/yyyyyyy2/sr3_2/sr3.data2
input datafile file number=00007 name=/oracle/XXX/yyyyyyy4/sr3_4/sr3.data4
channel c3: starting piece 1 at 15-FEB-20
channel c4: starting full datafile backup set
channel c4: specifying datafile(s) in backup set
input datafile file number=00018
name=/oracle/XXX/yyyyyyy5/sr3_15/sr3.data15
input datafile file number=00009 name=/oracle/XXX/yyyyyyy1/sr3_6/sr3.data6
input datafile file number=00006 name=/oracle/XXX/yyyyyyy3/sr3_3/sr3.data3
input datafile file number=00010 name=/oracle/XXX/yyyyyyy2/sr3_7/sr3.data7
channel c4: starting piece 1 at 15-FEB-20
channel c3: finished piece 1 at 16-FEB-20
piece
handle=/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/XXX_20200215_35698_1_FULL
tag=ORCL_FULL comment=NONE channel c3: backup set complete, elapsed time:
11:02:29
channel c3: starting full datafile backup set
channel c3: specifying datafile(s) in backup set
input datafile file number=00023
name=/oracle/XXX/yyyyyyy5/sr3_20/sr3.data20
input datafile file number=00012 name=/oracle/XXX/yyyyyyy4/sr3_9/sr3.data9
input datafile file number=00014
name=/oracle/XXX/yyyyyyy1/sr3_11/sr3.data11
input datafile file number=00011 name=/oracle/XXX/yyyyyyy3/sr3_8/sr3.data8
channel c3: starting piece 1 at 16-FEB-20
channel c4: finished piece 1 at 16-FEB-20
piece
handle=/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/XXX_20200215_35699_1_FULL
tag=ORCL_FULL comment=NONE channel c4: backup set complete, elapsed time:
11:08:38
channel c4: starting full datafile backup set
channel c4: specifying datafile(s) in backup set
input datafile file number=00017
name=/oracle/XXX/yyyyyyy4/sr3_14/sr3.data14
input datafile file number=00019
name=/oracle/XXX/yyyyyyy1/sr3_16/sr3.data16
input datafile file number=00016
name=/oracle/XXX/yyyyyyy3/sr3_13/sr3.data13
input datafile file number=00020
name=/oracle/XXX/yyyyyyy2/sr3_17/sr3.data17
channel c4: starting piece 1 at 16-FEB-20
channel c1: finished piece 1 at 16-FEB-20
piece
handle=/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/XXX_20200215_35696_1_FULL
tag=ORCL_FULL comment=NONE channel c1: backup set complete, elapsed time:
20:00:10
channel c1: starting full datafile backup set
channel c1: specifying datafile(s) in backup set
input datafile file number=00022
name=/oracle/XXX/yyyyyyy4/sr3_19/sr3.data19
input datafile file number=00024
name=/oracle/XXX/yyyyyyy1/sr3_21/sr3.data21
input datafile file number=00021
name=/oracle/XXX/yyyyyyy3/sr3_18/sr3.data18
channel c1: starting piece 1 at 16-FEB-20
channel c2: finished piece 1 at 16-FEB-20
piece
handle=/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/XXX_20200215_35697_1_FULL
tag=ORCL_FULL comment=NONE channel c2: backup set complete, elapsed time:
20:19:31
channel c2: starting full datafile backup set
channel c2: specifying datafile(s) in backup set
including current control file in backup set
channel c2: starting piece 1 at 16-FEB-20
channel c2: finished piece 1 at 16-FEB-20
piece
handle=/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/XXX_20200216_35703_1_FULL
tag=ORCL_FULL comment=NONE channel c2: backup set complete, elapsed time:
00:00:35
channel c2: starting full datafile backup set
channel c2: specifying datafile(s) in backup set
including current SPFILE in backup set
channel c2: starting piece 1 at 16-FEB-20
channel c2: finished piece 1 at 16-FEB-20
piece
handle=/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/XXX_20200216_35704_1_FULL
tag=ORCL_FULL comment=NONE channel c2: backup set complete, elapsed time:
00:00:45
channel c3: finished piece 1 at 16-FEB-20
piece
handle=/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/XXX_20200216_35700_1_FULL
tag=ORCL_FULL comment=NONE channel c3: backup set complete, elapsed time:
09:34:04
channel c4: finished piece 1 at 16-FEB-20
piece
handle=/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/XXX_20200216_35701_1_FULL
tag=ORCL_FULL comment=NONE channel c4: backup set complete, elapsed time:
09:33:36
channel c1: finished piece 1 at 16-FEB-20
piece
handle=/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/XXX_20200216_35702_1_FULL
tag=ORCL_FULL comment=NONE channel c1: backup set complete, elapsed time:
02:54:09
Finished backup at 16-FEB-20
Starting backup at 16-FEB-20
current log archived
channel c1: starting archived log backup set
channel c1: specifying archived log(s) in backup set
input archived log thread=1 sequence=37974 RECID=18955 STAMP=1032496773
channel c1: starting piece 1 at 16-FEB-20
channel c2: starting archived log backup set
channel c2: specifying archived log(s) in backup set
input archived log thread=1 sequence=37975 RECID=18956 STAMP=1032532861
channel c2: starting piece 1 at 16-FEB-20
channel c3: starting archived log backup set
channel c3: specifying archived log(s) in backup set
input archived log thread=1 sequence=37976 RECID=18957 STAMP=1032548784
channel c3: starting piece 1 at 16-FEB-20
channel c1: finished piece 1 at 16-FEB-20
piece
handle=/oracle/XXX/oraflash/XXX/backupset/2020_02_16/o1_mf_annnn_TAG20200216T192139_h4m5l6cj_.bkp
tag=TAG20200216T 192139 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:03
channel c2: finished piece 1 at 16-FEB-20
piece
handle=/oracle/XXX/oraflash/XXX/backupset/2020_02_16/o1_mf_annnn_TAG20200216T192139_h4m5l6f5_.bkp
tag=TAG20200216T 192139 comment=NONE
channel c2: backup set complete, elapsed time: 00:00:03
channel c3: finished piece 1 at 16-FEB-20
piece
handle=/oracle/XXX/oraflash/XXX/backupset/2020_02_16/o1_mf_annnn_TAG20200216T192139_h4m5l7sx_.bkp
tag=TAG20200216T 192139 comment=NONE
channel c3: backup set complete, elapsed time: 00:00:03
Finished backup at 16-FEB-20
Starting backup at 16-FEB-20
channel c1: starting full datafile backup set
channel c1: specifying datafile(s) in backup set
including current control file in backup set
channel c1: starting piece 1 at 16-FEB-20
channel c1: finished piece 1 at 16-FEB-20
piece
handle=/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/XXX_20200216_35708_1_CONTROL
tag=ORCL_CONTROL comment=NONE channel c1: backup set complete, elapsed
time: 00:00:01
Finished backup at 16-FEB-20
RMAN retention policy will be applied to the command
RMAN retention policy is set to recovery window of 4 days
Deleting the following obsolete backups and copies:
Type Key Completion Time Filename/Handle
-------------------- ------ ------------------ --------------------
Control File Copy 24619 22-FEB-18
/oracle/XXX/YYYreorg/sexwtcxc/cntrlXXX.old
Control File Copy 24620 22-FEB-18
/oracle/XXX/YYYreorg/sexwtcxc/cntrlXXX.new
Control File Copy 24621 22-FEB-18
/oracle/XXX/YYYreorg/sexwtnsl/cntrlXXX.old
Control File Copy 24622 22-FEB-18
/oracle/XXX/YYYreorg/sexwtnsl/cntrlXXX.new
Control File Copy 24623 22-FEB-18
/oracle/XXX/YYYreorg/sexwtthh/cntrlXXX.old
Control File Copy 24624 22-FEB-18
/oracle/XXX/YYYreorg/sexwtthh/cntrlXXX.new
Control File Copy 24625 22-FEB-18
/oracle/XXX/YYYreorg/sexwttjx/cntrlXXX.old
Control File Copy 24626 22-FEB-18
/oracle/XXX/YYYreorg/sexwttjx/cntrlXXX.new
Control File Copy 24627 22-FEB-18
/oracle/XXX/YYYreorg/sexwuasu/cntrlXXX.old
Control File Copy 24628 22-FEB-18
/oracle/XXX/YYYreorg/sexwuasu/cntrlXXX.new
Control File Copy 24629 23-FEB-18
/oracle/XXX/YYYreorg/sexwuqtu/cntrlXXX.old
Control File Copy 24630 23-FEB-18
/oracle/XXX/YYYreorg/sexwuqtu/cntrlXXX.new
Control File Copy 24631 08-MAR-18
/oracle/XXX/YYYreorg/sexzjthw/cntrlXXX.old
Control File Copy 24632 08-MAR-18
/oracle/XXX/YYYreorg/sexzjthw/cntrlXXX.new
Control File Copy 24633 11-MAY-18 /tmp/control01.ctl
Control File Copy 24634 14-MAY-18 /oracle/XXX/112_64/dbs/snapcf_XXX.f
Control File Copy 24635 22-APR-19
/oracle/XXX/YYYreorg/sfaywtzs/cntrlXXX.old
Control File Copy 24636 22-APR-19
/oracle/XXX/YYYreorg/sfaywtzs/cntrlXXX.new
Control File Copy 24637 22-APR-19
/oracle/XXX/YYYreorg/sfaywukz/cntrlXXX.old
Control File Copy 24638 22-APR-19
/oracle/XXX/YYYreorg/sfaywukz/cntrlXXX.new
Control File Copy 24639 26-SEP-19 /oracle/XXX/YYYbackup/cntrlXXX.dbf
Backup Set 3276340 02-FEB-20
Backup Piece 3276351 02-FEB-20
/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/XXX_20200202_35669_1_FULL
deleted backup piece
backup piece
handle=/backup_new/YYY_Backups/xxxxxxxxxxxxx/XXX/rman/XXX_20200202_35669_1_FULL
RECID=23483 STAMP=103132361 4
Deleted 1 objects
RMAN-06207: WARNING: 21 objects could not be deleted for DISK channel(s)
due
RMAN-06208: to mismatched status. Use CROSSCHECK command to fix status
RMAN-06210: List of Mismatched objects
RMAN-06211: ==========================
RMAN-06212: Object Type Filename/Handle
RMAN-06213: ---------------
---------------------------------------------------
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexwtcxc/cntrlXXX.old
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexwtcxc/cntrlXXX.new
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexwtnsl/cntrlXXX.old
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexwtnsl/cntrlXXX.new
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexwtthh/cntrlXXX.old
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexwtthh/cntrlXXX.new
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexwttjx/cntrlXXX.old
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexwttjx/cntrlXXX.new
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexwuasu/cntrlXXX.old
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexwuasu/cntrlXXX.new
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexwuqtu/cntrlXXX.old
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexwuqtu/cntrlXXX.new
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexzjthw/cntrlXXX.old
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sexzjthw/cntrlXXX.new
RMAN-06214: Datafile Copy /tmp/control01.ctl
RMAN-06214: Datafile Copy /oracle/XXX/112_64/dbs/snapcf_XXX.f
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sfaywtzs/cntrlXXX.old
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sfaywtzs/cntrlXXX.new
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sfaywukz/cntrlXXX.old
RMAN-06214: Datafile Copy /oracle/XXX/YYYreorg/sfaywukz/cntrlXXX.new
RMAN-06214: Datafile Copy /oracle/XXX/YYYbackup/cntrlXXX.dbf
released channel: c1
released channel: c2
released channel: c3
released channel: c4
Recovery Manager complete.
On Sun, Feb 23, 2020 at 9:15 PM Mladen Gogala <gogala.mladen@xxxxxxxxx>
wrote:
BR*Tools do leave a log file and have several methods. One of them is
UTL_FILE, the other one is RMAN. UTL_FILE is basially, version 7 style
backup of files with the database in the backup mode. Another brbackup
method is RMAN, with some twists. BR*Tools can't utilize catalog. I wander
what method is used by BR*Tools. BR*Tools, as opposed to RMAN, can also
utilize snapshots. The phrase "SAP backup" doesn't mean much without the
exact configuration of brbackup. BR*backup is also backing up the SAP
configuration files, which are ignored by usual RMAN backups. SAP only
certifies BR*Tools for SAP R3 backup. RMAN backup is not certified. There
are many nuances here, and discussing BR*Tools without knowing the details
is pointless.
On 2/23/20 9:23 PM, Jack van Zanen wrote:
First question: Can they prove it is your backup causing the Performance
issue. You may be on a wild goose chase
Even SAP backups most likely leave a log file behind somewhere that
should tell you what the SAP backup is doing (is it actually making a
backup?) . Don't they use RMAN under the hood anyway?
Regards
Jack van Zanen
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Thank you for your cooperation
On Sat, Feb 22, 2020 at 6:22 AM Sandra Becker <sbecker6925@xxxxxxxxx>
wrote:
Oracle EE v11.2Mladen Gogala
The Basis admin from another team has asked if I can help him find out
why RMAN backups of his SAP database cause severe performance issues in the
database with only two channels. Yet the SAP backup method runs with 6
parallel processes in about 4-5 hours. I know nothing about how the SAP
backups are configured and don't have access to any of that information, so
I'm not sure you'll be able to provide much help to us. I do know the
following:
- they don't use ASM
- all files are on the same NFS mount, including the datafiles,
binaries, logs, audit files, etc.
- archivelogs are kept for 3 days and written to another NFS mounted
drive
- SAP backup method uses 6 channels, backup completes in 4-5 hours
- RMAN backup was set for 2 channels, backup tool over 12 hours and
caused significant performance degradation (so I was told, I can't prove
it)
Any suggestions on what they should look at to see what's going on or
adjustments they should look into? I've looked at their RMAN configuration
and it's actually pretty close to what I use in my production databases,
just minor differences for path names and the like.
--
Sandy B.
--
Database Consultant
Tel: (347) 321-1217
--
Sandy B.
