Estimate rman backup size & time

Hi DBAs,
ENV : 11gR2, Windows 2008 server, 64bit,RAM=12 gb,
DB size=370 gb., SGA=5 gb, ASMM=enabled.
We need to move this database to Windows 2012 server which runs on Hyper-V. Can you guys suggest what are the best methods to move with limited downtime ?
If we opt for RMAN, is there any way to measure to estimate backup size ? ( at-least, approximate size) and how much time it takes to complete?
Please share your thoughts !!
Thanks,
Hari

Thank you sb92075 :
Your statement - Size depends upon how much of the 370GB are indexes
Would it mean, Rman is not going to take indexes to backup sets? or can you elaborate or refer me a link to study.
and my total indexs are of size 18GB
{code?
select segment_type, sum(bytes)/1024/1024/1024 from dba_segments where segment_type in ('INDEX PARITION','INDEX')
group by segment_type
SEGMENT_TY SUM(BYTES)/1024/1024/1024
INDEX 18.6002808
{code?
Are we able to guess approximate backup size?

Similar Messages

Estimate rman backup size

Hi,
Can anyone tell me how can i estimate a rman backup size ?
i need to figure out the worst case so i can prepaire the proper disks
10x.

The 'worst case' is the same size as the database size, WHEN image copies are used instead of backupsets. To prepare proper disk size you have to answer another question: How many backups do you plan to store? You have to define a retention policy, number of backups or number of days you want to go back in time.
Werner

Estimate database backup size

Hi All,
AIX 5.3
oracle 10.2.0.3
I have production database of 80 GB. I want to take a cold backup during the upgrade process. Now i want to know database backup size. so we can free space from some mount point accordingly.
Is there any way to estimate database backup size?
Thanks,
Vishal

Question: how did you establish that your database is actually 80G?
Is that 80G of data in the database, or is it the sum of all data files, temp tablespace files, undo tablespace files, redo logs, oracle binary software files, control files, etc?
If you intend to do an upgrade of the software, my recommendation is to shut the database down and do a full copy of:
1) your entire oracle product tree (usually /oracle/product), including ORACLE_HOME.
2) your entire 'oradata' structure which (should) include all of your Oracle database data files and all other associated files.

Sql to check RMAN backup size

Hi All
Kinldy tell me how i can check the RMAN Backup size from sql command. I am taking Full,Incrimental,Cumulative and Archive log backup.
Thanks
Krishna

try this,
SQL> select ctime "Date"
2       , decode(backup_type, 'L', 'Archive Log', 'D', 'Full', 'Incremental') backup_type
3       , bsize "Size MB"
4 from (select trunc(bp.completion_time) ctime
5            , backup_type
6            , round(sum(bp.bytes/1024/1024),2) bsize
7     from v$backup_set bs, v$backup_piece bp
8     where bs.set_stamp = bp.set_stamp
9     and bs.set_count = bp.set_count
10     and bp.status = 'A'
11     group by trunc(bp.completion_time), backup_type)
12 order by 1, 2;
Date      BACKUP_TYPE    Size MB
03-JUL-10 Archive Log       7.31
03-JUL-10 Full             29.81
03-JUL-10 Incremental    2853.85
04-JUL-10 Archive Log       3.59
04-JUL-10 Full              7.45
04-JUL-10 Incremental       3.05

ESTIMATED RMAN BACKUP SIZE:::PLZ HELP ME

Hi all,
I wish you all happy new year :)
I have implemented a new Backup STrategy with RMAN, such I using Oracle 10G version on Linux Server. I would like To know if exists one method to estimate the size of my full and incremental backup before to lunch? I will really apreciate your help :)
Thank you all,
W
Message was edited by:
HAGGAR

Hi,
Happy new year for you too!!!
From Metalink Note:105208.1:
There is no 'magic' formula to calculate the storage space of an RMAN backup
and there is no query that will give you a space estimate.
So, the best answer is: "Try it and see how much is used."
Check These out:
1-) https://metalink.oracle.com/metalink/plsql/f?p=130:14:4138343222012115291::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,105208.1,1,1,1,helvetica
2-) https://metalink.oracle.com/metalink/plsql/f?p=130:14:4138343222012115291::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,67221.1,1,0,1,helvetica
Cheers,
Marcello M.

Rman backup size for Dr db is very much higher than that of primary db

Hi All,
My production database on Oracle 10.2.0.4 had a physical size of 897 Gb and logical size of around 800 Gb.
Old tables were truncated from the database and its logical size got reduced to 230 Gb.
Backup size is now 55Gb which used to be of 130 Gb before truncation.
Now this database has a DR configured. Backup of this DR database is daily taken which is used to refresh test environments.
But the backup size for DR database has not decreased. The restoration time while refreshing test environments is also same as before.
We had predicted that the backup size for DR database will also decrease and hence reducing the restoration time.
We take compressed RMAN backup.
What is the concept behind this?

When you duplicate a database it will restore all the datafiles from the RMAN backup. You will find the physical space of your source database. Remove the fragmented space using object movement. Then shrink the tablespaces and take fresh RMAN backup and restore.
Regards
Asif Kabir

Rman backup size

Oracle11gr2,solaris10.
how do i check the size of my daily rman lvl0 backup.
i do a backup as compresses level 0.
i find the sizes listed in rman>list backupset summary; but i wanted to get as a consolidated.
My fra gets filled up after backing up the database continuously for 4 days. I remove the oldest backupset folder to release fra. I wanted to get a trend of how much rman is using each day for its backup.
Thanks
San~

SQL> select ctime "Date"
2       , decode(backup_type, 'L', 'Archive Log', 'D', 'Full', 'Incremental') backup_type
3       , bsize "Size MB"
4 from (select trunc(bp.completion_time) ctime
5          , backup_type
6          , round(sum(bp.bytes/1024/1024),2) bsize
7     from v$backup_set bs, v$backup_piece bp
8     where bs.set_stamp = bp.set_stamp
9     and bs.set_count = bp.set_count
10     and bp.status = 'A'
11     group by trunc(bp.completion_time), backup_type)
12 order by 1, 2;
Date      BACKUP_TYPE    Size MB
03-JUL-10 Archive Log       7.31
03-JUL-10 Full             29.81
03-JUL-10 Incremental    2853.85
04-JUL-10 Archive Log       3.59
04-JUL-10 Full              7.45
04-JUL-10 Incremental       3.05refer : How to find backupset sizes for full and incremental backups answered by ebrian
How to find backupset sizes for full and incremental backups
Total questions     45 (39 unresolved) : mark the question as answered if you get the answer for your questions.
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- OTN Edited by: rajeysh on Jul 7, 2010 2:11 AM

RMAN backup to write on tape and disk in the same time

Hi all,
I want to take backup using RMAN and to have the backup file in a tape and a disk, i know i can allocate channel for tape, or disk. My question is can i use the both disk and tape in an rman backup one time. I mean i want to have rman writing backup file in a local disk and a tape in the same time to have redoundant backup at a tape and local disk.
If some scripts is there, it will be welcome.
Thanks
Raitsarevo

See Duplexing backup sets.

Rman Backupset size is exceeding the database size

Hi
my rman backup size is exceeding the database backup size and occupying the full mountpoint. and finally due to space issue, backup is failing.
Below is the RMAN script
run {
backup
incremental level 0
tag ASCPLVL0
database plus archivelog ;
delete noprompt backupset completed before 'sysdate - 4/24' ;
Please look into this
Regards
M. Satyanvesh

Are you using compression?
Ans: No
The size of an RMAN backup isn't always proportional to the size of the database.
Ans: yeah I know, but it should be somewhere near to database size(lets say 100gb or 150 gb variance)
How many archivelogs are you backing up with your database? This is possibly a factor in the size of your db backup.
Ans: archive log count per day is 18 and size is 34gb
Have you got a retention policy in place and do you regularly delete obsolete backups/archivelogs?
Ans: yes
Are you taking this backup as part of a backup strategy? or is this just a one off for some other purpose which would seem to be the case.
Ans: This is production systesm so its a part of backup strategy

RMAN Backups residing remotely

Oracle Version: 11.2.0.3 x64
OS: Win 2008 server x64
Hi Experts.
We need to replicate a database on one of our boxes, with very limited space on disk. The database size is roughly 200gb, free space on disk is 250gb, and the RMAN backups are roughly 80gb.
The RMAN backup pieces have been cataloged with the following path:
CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT   'd:\rman\%d\bkup_%d_%U';So, if we attempt a restore/replication on the local server, RMAN would look for backups on the local D drive, under D:\rman\<db_name>\
In the past we used to copy the RMAN backups on the local server where the replication is required, and perform the replication locally without any issues; however, with a very limited space that won't fit both the replicated instance and the RMAN copies, we're not quite sure how further proceed!?
Can we instruct the RMAN replication session to look for backups in a remote server?
We do keep 3 weeks of RMAN backups on disk, hence the 80GB RMAN backups size. As far as I remember a full backup has been performed last Sun. Can we only bring over Sun full backup (and any subsequent incremental backups)? or do we need to copy the whole thing across to the local server?
Any ideas please?
Thanks

I've been trying the duplicate command with the "from active database" clause but we're getting some permissions errors that I'm not sure about:
C:\Users\oracle>rman target sys/xxx@vssrp auxiliary sys/password@vssrl
Recovery Manager: Release 11.2.0.3.0 - Production on Sat Sep 1 16:28:25 2012
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
connected to target database: vssrp (DBID=1391811405)
connected to auxiliary database: vssrl (not mounted)
RMAN> run {
2>    allocate channel c1 type disk;
3>    allocate auxiliary channel DUP type disk;
4>    duplicate target database to vssrl from active database;
5> }
using target database control file instead of recovery catalog
allocated channel: c1
channel c1: SID=1252 device type=DISK
allocated channel: DUP
channel DUP: SID=673 device type=DISK
Starting Duplicate Db at 01-SEP-12
contents of Memory Script:
   sql clone "create spfile from memory";
executing Memory Script
sql statement: create spfile from memory
contents of Memory Script:
   shutdown clone immediate;
   startup clone nomount;
executing Memory Script
Oracle instance shut down
connected to auxiliary database (not started)
Oracle instance started
Total System Global Area    3140026368 bytes
Fixed Size                     2259312 bytes
Variable Size                788530832 bytes
Database Buffers            2315255808 bytes
Redo Buffers                  33980416 bytes
allocated channel: DUP
channel DUP: SID=578 device type=DISK
contents of Memory Script:
   sql clone "alter system set db_name =
''vssrp'' comment=
''Modified by RMAN duplicate'' scope=spfile";
   sql clone "alter system set db_unique_name =
''vssrl'' comment=
''Modified by RMAN duplicate'' scope=spfile";
   shutdown clone immediate;
   startup clone force nomount
   backup as copy current controlfile auxiliary format 'C:\ORACLE\ORADATA\CONTROLFILE\vssrl\CONTROL01.CTL';
   restore clone controlfile to 'D:\ORACLE\ORADATA\CONTROLFILE\vssrl\CONTROL02.CTL' from
'C:\ORACLE\ORADATA\CONTROLFILE\vssrl\CONTROL01.CTL';
   restore clone controlfile to 'D:\ORACLE\ORADATA\vssrl\CONTROL03.CTL' from
'C:\ORACLE\ORADATA\CONTROLFILE\vssrl\CONTROL01.CTL';
   alter clone database mount;
executing Memory Script
sql statement: alter system set db_name = ''vssrp'' comment= ''Modified by RMAN duplicate'' scope=spfile
sql statement: alter system set db_unique_name = ''vssrl'' comment= ''Modified by RMAN duplicate'' scope=spfile
Oracle instance shut down
Oracle instance started
Total System Global Area    3140026368 bytes
Fixed Size                     2259312 bytes
Variable Size                788530832 bytes
Database Buffers            2315255808 bytes
Redo Buffers                  33980416 bytes
allocated channel: DUP
channel DUP: SID=578 device type=DISK
Starting backup at 01-SEP-12
channel c1: starting datafile copy
copying current control file
released channel: c1
released channel: DUP
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 09/01/2012 16:29:14
RMAN-05501: aborting duplication of target database
RMAN-03015: error occurred in stored script Memory Script
RMAN-03009: failure of backup command on c1 channel at 09/01/2012 16:29:14
ORA-17629: Cannot connect to the remote database server
ORA-17627: ORA-01031: insufficient privileges
ORA-17629: Cannot connect to the remote database serverAs you can see from the above, we're logging in to both databases (target and aux) as sys; also the local OS oracle user is a member of administrators and can write files on to disks.
Any idea please?
Thanks

Why is RMAN backup of 2TB DB still 2TB when expdp dump was only 600mb ?

RDBMS version: 11.2.0.3/Oracle Linux 6.2
We took an RMAN backup of below mentioned DB.
Since DBA_SEGMENTS was showing 2TB , I thought RMAN backup size will be half of that .ie. 1TB . But the RMAN backup size was 1.95 TB!
expdp of the full DB was only 600mb !
SQL> select sum(bytes/power(1024,3)) from dba_segments;
SUM(BYTES/POWER(1024,3))
              2056.27728
SQL> select sum(bytes/power(1024,3)) sumbytesGB, sum(maxbytes/power(1024,3)) sumMaxBytes from dba_data_files;
SUMBYTESGB SUMMAXBYTES
      5451 427.998978
SQL> col file_name format a75
SQL> set pages 300
SQL> select file_name, bytes/power(1024,3) bytesGB, maxbytes/power(1024,3) from dba_data_files;
FILE_NAME                                                                      BYTESGB MAXBYTES/POWER(1024,3)
+CMS_DATA/bcmsprd/datafile/cms_s_asset_xa_dat_01.dbf                                20                      0
+CMS_DATA/bcmsprd/datafile/cms_s_asset_xa_dat_02.dbf                                20                      0
+CMS_DATA/bcmsprd/datafile/cms_s_asset_xa_dat_03.dbf                                20                      0
+CMS_DATA/bcmsprd/datafile/cms_s_asset_xa_dat_04.dbf                                20                      0
+CMS_DATA/bcmsprd/datafile/cms_s_asset_xa_dat_05.dbf                                20                      0
+CMS_DATA/bcmsprd/datafile/cms_s_asset_xa_dat_06.dbf                                20                      0
+CMS_DATA/bcmsprd/datafile/cms_s_asset_xa_dat_07.dbf                                20                      0
+CMS_DATA/bcmsprd/datafile/cms_s_asset_xa_dat_08.dbf                                20                      0
+CMS_DATA/bcmsprd/datafile/users.271.803502221                                       6             31.9999847
+CMS_DATA/bcmsprd/datafile/undotbs1.265.803502221                                   20                     20
+CMS_DATA/bcmsprd/datafile/sysaux.272.803502221                                     10             31.9999847
+CMS_DATA/bcmsprd/datafile/system.260.803502221                                     10             31.9999847
+CMS_DATA/bcmsprd/datafile/undotbs2.261.803502407                                   20                     20
+CMS_DATA/bcmsprd/datafile/undotbs3.267.803502407                                   20                     20
+CMS_DATA/bcmsprd/datafile/cms_s_asset_xa_dat_09.dbf                                20                      0
+CMS_DATA/bcmsprd/datafile/cms_s_asset_xa_dat_10.dbf                                20                      0
<snipped>

RMAN does a backup of all formatted blocks --- even if rows have been deleted and the blocks are "logically empty". expdp, obviously, does not backup deleted rows. Similarly, if you've created a table and then subsequently truncated it, the blocks would remain formatted and be candidates for RMAN Backups. Truncated tables would be "empty" and would result in 0 rows exported.
So, you'd have this issue if you've deleted a large number of rows and/or issued truncates.
Hemant K Chitale

How to estimate recovery time from rman backup

how to estimate recovery time from rman backup?
The database is of size 800GB.
the approximate time to backup is 8- 10 hours.

"Recovery time" is : RESTORE DATABASE time + RECOVER DATABASE time.
RESTORE can be done
a. in parallel with multiple channels if your backup was created as multiple backupsets
b. using incremental backups
c. whether the backups are on
i. disk
ii. tape
Alternatively, if you have a Recovery Area with an Incrementally Update backup of the database, you can SWITCH DATABASE almost immediately
RECOVER depends on
a. how many archivelogs (in terms of size, not necessarily number) need to be applied
-- this depends on
i. transaction volume
ii. the "freshness" of the backups (how recent the backups are)
b. whether required archivelogs are available on disk (which can be the case if the database backup itself is a very recent backup and archivelogs since then haven't been deleted {whether they have been backed up or not}) OR whether they need to be restored from
i. disk backup
ii. tape backup

RMAN backup files are still exist since long time, how to delete?

Dear sir;
I'm using the below script to do daily backup, however there are many rman backup files are still exist and consumes HD size, how could I delete these files in daily bases? some files dated in FEB, MAR, APR,
============Daily RMAN script=========
rman target /<<!
backup incremental level=0 as compressed backupset database format '/u15/rman/full_backup_%U.rman';
backup archivelog all not backed up 2 times format '/u15/rman/arc_backup_%U.rman';
backup current controlfile format '/u15/rman/control_%U.rman';
delete archivelog all backed up 2 times to device type disk completed before 'sysdate-7';
delete noprompt obsolete;
================================END
Thanks and best regards
Ali

Hi;
Our backup policy should have 7 days; however we have here some files from JAN, FEB,MAR, APR /2012 WHICH ARE BEYOND THE RETENTION DATE and these files should be deleted by executing " delete noprompt obsolete; ".
All files are exist in /u15/rman/
-rw-r----- 1 oracle oinstall 1151763968 Jan 21 01:36 arc_backup_7kn19h4a_1_1.rman
-rw-r----- 1 oracle oinstall 1136882176 Jan 21 01:36 arc_backup_7ln19h4q_1_1.rman
-rw-r----- 1 oracle oinstall 1135984640 Jan 21 01:36 arc_backup_7mn19h5a_1_1.rman
-rw-r----- 1 oracle oinstall 1126627328 Jan 21 01:37 arc_backup_7nn19h5q_1_1.rman
-rw-r----- 1 oracle oinstall 880606720 Mar 12 02:53 arc_backup_7nn5ldhp_1_1.rman
-rw-r----- 1 oracle oinstall 1093043712 Jan 21 01:37 arc_backup_7on19h6a_1_1.rman
-rw-r----- 1 oracle oinstall 9797632 Dec 15 01:04 control_04mu7tcp_1_1.rman
-rw-r----- 1 oracle oinstall 36896768 Mar 3 02:55 control_4cn4tm9k_1_1.rman
-rw-r----- 1 oracle oinstall 36896768 Mar 4 02:53 control_4on50ahm_1_1.rman
-rw-r----- 1 oracle oinstall 36896768 Mar 5 02:55 control_56n52v1j_1_1.rman
-rw-r----- 1 oracle oinstall 16252928 Jan 23 01:40 control_8tn1eq3t_1_1.rman
-rw-r----- 1 oracle oinstall 16252928 Jan 24 01:40 control_9cn1heg0_1_1.rman
-rw-r----- 1 oracle oinstall 202940416 Dec 15 01:04 full_backup_01mu7t50_1_1.rman
-rw-r----- 1 oracle oinstall 1097728 Dec 15 01:04 full_backup_02mu7tcc_1_1.rman
-rw-r----- 1 oracle oinstall 201285632 Dec 14 01:04 full_backup_0nmu58ou_1_1.rman
-rw-r----- 1 oracle oinstall 5957304320 Feb 29 02:46 full_backup_2ln4g9l1_1_1.rman
-rw-r----- 1 oracle oinstall 4128768 Feb 29 02:47 full_backup_2mn4gft8_1_1.rman
-rw-r----- 1 oracle oinstall 6027075584 Mar 1 02:49 full_backup_32n4o6ov_1_1.rman
-rw-r----- 1 oracle oinstall 4128768 Mar 1 02:49 full_backup_33n4od66_1_1.rman
-rw-r----- 1 oracle oinstall 6187171840 Mar 2 02:51 full_backup_3gn4qr50_1_1.rman
-rw-r----- 1 oracle oinstall 4145152 Mar 2 02:51 full_backup_3hn4r1kn_1_1.rman
-rw-r----- 1 oracle oinstall 6115786752 Mar 3 02:51 full_backup_40n4tfgu_1_1.rman
above is a short list of contents.
to do our daily backup we perform the following script (in daily)
==================
backup incremental level=0 as compressed backupset database format '/u15/rman/full_backup_%U.rman';
backup archivelog all not backed up 2 times format '/u15/rman/arc_backup_%U.rman';
backup current controlfile format '/u15/rman/control_%U.rman';
delete archivelog all backed up 2 times to device type disk completed before 'sysdate-7';
delete noprompt obsolete;
==================
Thanks and best regards
Ali

Estimating the backup size before running the RMAN

DB Version : 11.2
OS : Oracle Solaris 10
I need to take an ad-hoc RMAN cold backup of a 200GB DB to Local Disk. Using RMAN, is there any way I could check how much the backup size would be before I take the cold backup ?

Read the metalink How to estimate the size of an RMAN database backup [ID 1274720.1].

RMAN backup time increased

Hi All,
I need details about some diagnostic test regarding RMAN backup on my instance.
The following are the current configuration of details:
SQL> select release_name from fnd_product_groups;
RELEASE_NAME
11.5.8
SQL> select * from v$version;
BANNER
Oracle9i Enterprise Edition Release 9.2.0.8.0 - 64bit Production
PL/SQL Release 9.2.0.8.0 - Production
CORE 9.2.0.8.0 Production
TNS for Solaris: Version 9.2.0.8.0 - Production
NLSRTL Version 9.2.0.8.0 - Production
===============================================
Database Size
1.5 TB
Earlier the RMAN backup used to take 20 -23 hours, now for the last 2 months, it has started taking 40 hours.
We want to identify the reason behind the increase in time.
Please let us know methods that we can use to diagnose the root cause.
Thanks
Peeks

Hi Talip,
Thanks for you suggestions.
I tried the three queries suggested by you, please find below the output:
SQL> select set_stamp from v$backup_async_io where to_date(open_time,'dd.mon.rr')='05.mar.12';
SET_STAMP
777154038
777154038
777154038
777154038
777154038
777154038
777154038
777154038
777154038
777154038
777167658
SET_STAMP
777167658
777167658
777167673
777167673
777167673
16 rows selected.The we checked the effective_bytes_per_second "mb/sec" column for the 777154038 and 777167658 Set_stamps.
SQL> select device_type "Device",
type,
open_time,close_time,
elapsed_time/100 "Ela",
effective_bytes_per_second/1024/1024 "mb/sec",
filename
from v$backup_async_io
where set_stamp = &a
order by close_time desc; 2    3    4    5    6    7    8    9
Enter value for a: 777154038
old   8: where set_stamp = &a
new   8: where set_stamp = 777154038
Device          TYPE      OPEN_TIME       CLOSE_TIME             Ela     mb/sec FILENAME
SBT_TAPE        OUTPUT    05-MAR-12       05-MAR-12            13498 3.03509712 bk_87606_1_777154038
SBT_TAPE        OUTPUT    05-MAR-12       05-MAR-12            13475 3.03425884 bk_87605_1_777154038
DISK            AGGREGATE 05-MAR-12       05-MAR-12            13476   3.041852
DISK            INPUT     05-MAR-12       05-MAR-12             2832 2.90395451 /u1141/oradata/PRD1/rbs03.dbf
DISK            AGGREGATE 05-MAR-12       05-MAR-12            13446 3.0486393
DISK            INPUT     05-MAR-12       05-MAR-12             2829 2.90703392 /u1141/oradata/PRD1/rbs01.dbf
DISK            INPUT     05-MAR-12       05-MAR-12             5332 3.07276821 /u1140/oradata/PRD1/ard01.dbf
DISK            INPUT     05-MAR-12       05-MAR-12             5314 3.08317661 /u1140/oradata/PRD1/applsysx01.dbf
DISK            INPUT     05-MAR-12       05-MAR-12             5309 3.08608055 /u1140/oradata/PRD1/gld01.dbf
DISK            INPUT     05-MAR-12       05-MAR-12             5300 3.09132099 /u1140/oradata/PRD1/applsysd01.dbf
10 rows selected.
SQL> /
Enter value for a: 777167658
old   8: where set_stamp = &a
new   8: where set_stamp = 777167658
Device          TYPE      OPEN_TIME       CLOSE_TIME             Ela     mb/sec FILENAME
SBT_TAPE        OUTPUT    05-MAR-12       06-MAR-12            13323 3.07180786 bk_87607_1_777167658
DISK            AGGREGATE 05-MAR-12       06-MAR-12            13289 3.08224869
DISK            INPUT     06-MAR-12       06-MAR-12             2652 3.08898926 /u1141/oradata/PRD1/rbs02.dbf
DISK            INPUT     06-MAR-12       06-MAR-12             5330 3.0739212 /u1140/oradata/PRD1/invd01.dbf
DISK            INPUT     05-MAR-12       06-MAR-12             5305 3.08840752 /u1140/oradata/PRD1/arx01.dbf
SQL>The above output looks fine, but when i checked the long wait uery, it showed high percentage usage for OUTPUT streams. The below is the output:
TYPE        IO_COUNT      READY SHORT_WAITS LONG_WAITS    LIO_PCT FILENAME
INPUT          16385      15361           0       1024 6.24961855 /u1140/oradata/PRD1/applsysd01.dbf
INPUT          16385      15361           0       1024 6.24961855 /u1140/oradata/PRD1/applsysx01.dbf
INPUT          16385      15361           0       1024 6.24961855 /u1140/oradata/PRD1/ard01.dbf
INPUT          16385      15361           0       1024 6.24961855 /u1140/oradata/PRD1/gld01.dbf
INPUT           8225       7711           0        514 6.24924012 /u1141/oradata/PRD1/rbs01.dbf
INPUT           8225       7711           0        514 6.24924012 /u1141/oradata/PRD1/rbs03.dbf
OUTPUT         10222       7662           0       2560 25.0440227 bk_87605_1_777154038
OUTPUT         10242       7678           0       2564 25.034173 bk_87606_1_777154038
AGGREGATE      40995      38433           0       2562 6.24954263
AGGREGATE      40995      38433           0       2562 6.24954263
10 rows selected.
TYPE        IO_COUNT      READY SHORT_WAITS LONG_WAITS    LIO_PCT FILENAME
INPUT          16385      15361           0       1024 6.24961855 /u1140/oradata/PRD1/arx01.dbf
INPUT          16385      15361           0       1024 6.24961855 /u1140/oradata/PRD1/invd01.dbf
INPUT           8193       7681           0        512 6.24923715 /u1141/oradata/PRD1/rbs02.dbf
OUTPUT         10232       7669           0       2563 25.0488663 bk_87607_1_777167658
AGGREGATE      40963      38403           0       2560 6.24954227So, as per the output please suggest possible solutions to decrease the backup time, if not possible any other option.
Is there any problem with the tape device or is it an oracle issue.
Thanks
Peeks

Estimate rman backup size & time

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