Only the unused blocks backup RMAN as well?

DB version: 11.2.0.4

OS: RHEL 6.6

If I remember correctly, RMAN backs up only used blocks. I created a tablespace of 20 GB, as shown below. When I backed up, the backup piece is only 4MB in size, as shown below.

SQL > create tablespace TEST_TS3 datafile '+ DATA_DG' size 20 G

autoextend on

MaxSize 32767 m

Local extended management

single 4 M size

Auto segment space management;

Created tablespace.

SQL >

SQL > select tablespace_name, bytes/1024/1024 of dba_Data_Files where nom_tablespace = 'TEST_TS3 ';

BYTES/1024/1024 NOM_TABLESPACE

------------------------------ ---------------

TEST_TS3 20480

Backup tablespace TEST_TS3 that is not used by all segments (empty)

RMAN > backup tablespace TEST_TS3 format='/u05/RMAN_BKP/TBS_%U_%T.rmbk' tag = TEST_TS3_BKP;

From 18 February 16 backup

using the control file of the target instead of recovery catalog database

allocated channel: ORA_DISK_1

channel ORA_DISK_1: SID = 4941 instance = HMAGPRD2 = DISK device type

channel ORA_DISK_1: starting full datafile from backup set

channel ORA_DISK_1: specifying datafile (s) in the backup set

Enter a number of file datafile = name=+DATA_DG/hmagprd2/datafile/test_ts3.413.904152141 00144

channel ORA_DISK_1: starting piece 1-18 February 16

channel ORA_DISK_1: finished piece 1-18 February 16

piece handle=/u05/RMAN_BKP/TBS_03qu8hg2_1_1_20160218.rmbk tag = TEST_TS3_BKP comment = NONE

channel ORA_DISK_1: complete set of backups, time: 00:00:01

Backup finished on 18 February 16

$

$ ls - lh /u05/RMAN_BKP/TBS_03qu8hg2_1_1_20160218.rmbk

-rw - r - 1 oracle oinstall 4.1 M 18 Feb 17:29 /u05/RMAN_BKP/TBS_03qu8hg2_1_1_20160218.rmbk

But in the world of real output, size of the RMAN backups seems to be much higher.

The following production DB is 27.5 terabytes in size as evidenced by the physical layer (DBA_DATA_FILES. Column of BYTES)

SQL > select sum(bytes/1024/1024/1024) bytesGB from dba_Data_Files;

BYTESGB

----------

27885.3252

But at the level of the logic layer, the used space is only 16.5 TB as evidenced by DBA_EXTENTS. BYTES column

SQL > select sum(bytes/1024/1024/1024) bytesGB from dba_extents.

BYTESGB

----------

16621.316

But the size of RMAN backup came to 20 terabytes , become almost 4TB that space consumed at the level of the logical layer (DBA_EXTENTS. BYTES).

Why is this?

RMAN jump blocks that have never been used. If a block has been used in the past, it will be included in the same backup if currently is not used:

https://docs.Oracle.com/CD/B28359_01/backup.111/b28270/rcmcncpt.htm

Compression for backup sets

When you back up the data files of backup sets, RMAN can use unused block compression to skip blocks of data file. RMAN always ignores blocks that have never been used. Under certain conditions, which are listed in the BACKUP AS BACKUPSET entry in reference Oracle database backup and recovery, RMAN also ignores the blocks that are not currently used. Data file backup sets are generally smaller than copies of data file and take less time to write. Compression of the unused block is fundamental to how RMAN writes files of data in backup items and cannot be disabled.

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    total, handle = / backup/RMAN_Backup/rman_bkp_45oa23eh_1_1_ORCL_20130519_DATAFILE_LVL0_19_05_2013 tag = comment TAG20130519T200640 = NONE
    channel ch2: from part 2 to May 19, 13
    channel ch1: finished part 2 to May 19, 13
    total, handle = / backup/RMAN_Backup/rman_bkp_44oa23eg_2_1_ORCL_20130519_DATAFILE_LVL0_19_05_2013 tag = comment TAG20130519T200640 = NONE
    channel ch1: complete set of backups, time: 00:00:22
    channel ch1: start the incremental level 0 datafile backup set
    channel ch1: specification-datafile in the backup set (s)
    channel ch2: finished part 2 to May 19, 13
    total, handle = / backup/RMAN_Backup/rman_bkp_45oa23eh_2_1_ORCL_20130519_DATAFILE_LVL0_19_05_2013 tag = comment TAG20130519T200640 = NONE
    channel ch2: complete set of backups, time: 00:00:22
    including the current control in the backup set file
    channel ch1: from room 1 to May 19, 13
    channel ch1: finished piece 1 to May 19, 13
    total, handle = / backup/RMAN_Backup/rman_bkp_46oa23f7_1_1_ORCL_20130519_DATAFILE_LVL0_19_05_2013 tag = comment TAG20130519T200640 = NONE
    channel ch1: complete set of backups, time: 00:00:01
    Backup finished on 19 May 13

    From backup may 19, 13
    Current archived log
    channel ch1: Startup archived log backup set
    channel ch1: specifying the newspapers archived in the backup set
    archived journal entry thread = 2 sequence = 83 RECID = 399 STAMP = 815861227
    channel ch1: from room 1 to May 19, 13
    channel ch2: Startup archived log backup set
    channel ch2: specifying the newspapers archived in the backup set
    archived journal entry thread = 1 sequence = 90 RECID = 401 STAMP = 815861227
    channel ch2: from room 1 to May 19, 13
    channel ch1: finished piece 1 to May 19, 13
    piece handle=/u01/app/oracle/product/11.2.0/db_1/dbs/47oa23fd_1_1 tag = DATAFILE_FULL comment = NONE
    channel ch1: complete set of backups, time: 00:00:01
    channel ch1: archived deletion or newspapers
    name=+ORAFRA/ORCLdr/archivelog/logbd0ca058_2_83_814540431.arc RECID archived log file = 399 STAMP = 815861227
    channel ch2: finished piece 1 to May 19, 13
    piece handle=/u01/app/oracle/product/11.2.0/db_1/dbs/48oa23fd_1_1 tag = DATAFILE_FULL comment = NONE
    channel ch2: complete set of backups, time: 00:00:01
    channel ch2: archived deletion or newspapers
    RMAN-08137: WARNING: log archived not deleted, necessary for intelligence or upstream collection procedure
    Archive log file name=+ORAFRA/ORCLdr/archivelog/logbd0ca058_1_90_814540431.arc thread = 1 sequence = 90
    Backup finished on 19 May 13

    From control file and SPFILE Autobackup 19 May 13
    room handle=/u01/app/oracle/product/11.2.0/db_1/dbs/c-3171721304-20130519-00 comment = NONE
    File control finished and Autobackup SPFILE to 19 May 13
    output channel: ch1
    output channel: ch2

    RMAN >
    RMAN >
    RMAN retention policy apply to the order
    RMAN retention policy is set to 3 redundancy
    allocated channel: ORA_DISK_1
    channel ORA_DISK_1: SID = instance 1753 = ORCLdr2 = DISK device type
    Remove the following obsolete backups and copies:
    Making key time filename/handle type
    -------------------- ------ ------------------ --------------------
    8 4 may control file copy 13 /u01/app/oracle/product/11.2.0/db_1/dbs/snapcf_ORCLdr1.f
    Game save 40 9 May 13
    Save the piece 40 9 May 13/backup/RMAN_Backup/rman_bkp_1jo97nk1_1_1_ORCL_20130509_DATAFILE_LVL0_09_05_2013
    Save game 39 may 9, 13
    Save the song 39 9 May 13/backup/RMAN_Backup/rman_bkp_1ko97nk1_1_1_ORCL_20130509_DATAFILE_LVL0_09_05_2013
    Backs up the entire 42 9 May 13
    Backup total 42 9 May 13 /u01/app/oracle/product/11.2.0/db_1/dbs/1mo97nkl_1_1
    Backs up the entire 43 9 May 13
    Backup total 43 9 May 13 /u01/app/oracle/product/11.2.0/db_1/dbs/1no97nkl_1_1
    Save game 46 may 10, 13
    Backup total 46 may 10, 13 /u01/app/oracle/product/11.2.0/db_1/dbs/1po9abvp_1_1
    Game backup 45 may 10, 13
    Backup total 45 10 May 13 /u01/app/oracle/product/11.2.0/db_1/dbs/1qo9abvp_1_1
    Save game 47 10 May 13
    Save room 47 10 May 13/backup/RMAN_Backup/rman_bkp_1ro9ac02_1_1_ORCL_20130510_DATAFILE_LVL1_10_05_2013
    Backs up the entire 48 may 10, 13
    Save the piece 48 10 May 13/backup/RMAN_Backup/rman_bkp_1so9ac02_1_1_ORCL_20130510_DATAFILE_LVL1_10_05_2013
    Backs up the entire 50 10 May 13
    Backup total 50 10 May 13 /u01/app/oracle/product/11.2.0/db_1/dbs/1uo9ac0l_1_1
    Backs up the entire 51 may 10, 13
    Backup total 51 may 10, 13 /u01/app/oracle/product/11.2.0/db_1/dbs/1vo9ac0l_1_1
    Backs up the entire 54 may 11, 13
    Backup total 54 may 11, 13 /u01/app/oracle/product/11.2.0/db_1/dbs/21o9d0bi_1_1
    Save game 53 may 11, 13
    Backup total 53 may 11, 13 /u01/app/oracle/product/11.2.0/db_1/dbs/22o9d0bi_1_1
    Save game 55 may 11, 13
    Save the piece 55 may 11, 13/backup/RMAN_Backup/rman_bkp_23o9d0br_1_1_ORCL_20130511_DATAFILE_LVL1_11_05_2013
    Backs up the entire 56 may 11, 13
    Save the song 56 11 May 13/backup/RMAN_Backup/rman_bkp_24o9d0br_1_1_ORCL_20130511_DATAFILE_LVL1_11_05_2013
    Backs up the entire 58 may 11, 13
    Backup total 58 may 11, 13 /u01/app/oracle/product/11.2.0/db_1/dbs/26o9d0cj_1_1
    Save game 59 may 11, 13
    Backup total 59 may 11, 13 /u01/app/oracle/product/11.2.0/db_1/dbs/27o9d0cj_1_1
    Backs up the entire 62 12 May 13
    Backup total 62 12 May 13 /u01/app/oracle/product/11.2.0/db_1/dbs/29o9fknp_1_1
    Save game 61 12 May 13
    Backup total 61 12 May 13 /u01/app/oracle/product/11.2.0/db_1/dbs/2ao9fknp_1_1
    Save game 77 14 May 13
    Backup total 77 14 May 13 /u01/app/oracle/product/11.2.0/db_1/dbs/c-3171721304-20130514-00
    Game backup 101 16 May 13
    Backup total 101 16 May 13 /u01/app/oracle/product/11.2.0/db_1/dbs/c-3171721304-20130516-00
    Backs up the entire 114 18 May 13
    Save the song 117 may 18, 13/backup/RMAN_Backup/rman_bkp_3uo9vf2f_1_1_ORCL_20130518_DATAFILE_LVL1_18_05_2013
    remove the item from backup
    backup piece handle = / backup/RMAN_Backup/rman_bkp_1jo97nk1_1_1_ORCL_20130509_DATAFILE_LVL0_09_05_2013 RECID = 40 STAMP = 814997122
    remove the item from backup
    backup piece handle = / backup/RMAN_Backup/rman_bkp_1ko97nk1_1_1_ORCL_20130509_DATAFILE_LVL0_09_05_2013 RECID = STAMP 39 = 814997122
    remove the item from backup
    handle=/U01/app/Oracle/product/11.2.0/Db_1/DBS/1mo97nkl_1_1 element of backup RECID = STAMP 42 = 814997141
    remove the item from backup
    handle=/U01/app/Oracle/product/11.2.0/Db_1/DBS/1no97nkl_1_1 element of backup RECID = STAMP 43 = 814997141
    remove the item from backup
    handle=/U01/app/Oracle/product/11.2.0/Db_1/DBS/1po9abvp_1_1 element of backup RECID = STAMP 46 = 815083513
    remove the item from backup
    handle=/U01/app/Oracle/product/11.2.0/Db_1/DBS/1qo9abvp_1_1 element of backup RECID = STAMP 45 = 815083514
    remove the item from backup
    backup piece handle = / backup/RMAN_Backup/rman_bkp_1ro9ac02_1_1_ORCL_20130510_DATAFILE_LVL1_10_05_2013 RECID = STAMP 47 = 815083522
    remove the item from backup
    backup piece handle = / backup/RMAN_Backup/rman_bkp_1so9ac02_1_1_ORCL_20130510_DATAFILE_LVL1_10_05_2013 RECID = 48 STAMP = 815083522
    remove the item from backup
    handle=/U01/app/Oracle/product/11.2.0/Db_1/DBS/1uo9ac0l_1_1 element of backup RECID = STAMP 50 = 815083541
    remove the item from backup
    handle=/U01/app/Oracle/product/11.2.0/Db_1/DBS/1vo9ac0l_1_1 element of backup RECID = STAMP 51 = 815083541
    remove the item from backup
    handle=/U01/app/Oracle/product/11.2.0/Db_1/DBS/21o9d0bi_1_1 backup RECID piece = 54 STAMP = 815169906
    remove the item from backup
    handle=/U01/app/Oracle/product/11.2.0/Db_1/DBS/22o9d0bi_1_1 element of backup RECID = STAMP 53 = 815169906
    remove the item from backup
    backup piece handle = / backup/RMAN_Backup/rman_bkp_23o9d0br_1_1_ORCL_20130511_DATAFILE_LVL1_11_05_2013 RECID = STAMP 55 = 815169915
    remove the item from backup
    backup piece handle = / backup/RMAN_Backup/rman_bkp_24o9d0br_1_1_ORCL_20130511_DATAFILE_LVL1_11_05_2013 RECID = STAMP 56 = 815169917
    remove the item from backup
    handle=/U01/app/Oracle/product/11.2.0/Db_1/DBS/26o9d0cj_1_1 element of backup RECID = STAMP 58 = 815169939
    remove the item from backup
    handle=/U01/app/Oracle/product/11.2.0/Db_1/DBS/27o9d0cj_1_1 element of backup RECID = 59 STAMP = 815169939
    remove the item from backup
    handle=/U01/app/Oracle/product/11.2.0/Db_1/DBS/29o9fknp_1_1 element of backup RECID = 62 STAMP = 815256313
    remove the item from backup
    handle=/U01/app/Oracle/product/11.2.0/Db_1/DBS/2ao9fknp_1_1 backup RECID piece = 61 = 815256313 STAMP
    remove the item from backup
    handle=/U01/app/Oracle/product/11.2.0/Db_1/DBS/c-3171721304-20130516-00 element of backup RECID = 101 STAMP = 815601943
    remove the item from backup
    backup piece handle = / backup/RMAN_Backup/rman_bkp_3uo9vf2f_1_1_ORCL_20130518_DATAFILE_LVL1_18_05_2013 RECID = 117 STAMP = 815774800
    20 objects deleted

    RMAN-06207: WARNING: 2 items could not be removed for DISC due channels
    RMAN-06208: status do not match. Use the OVERLAP command to set status
    RMAN-06210: list of relevant objects
    RMAN-06211: =.
    RMAN-06212: filename/Type object Handle
    RMAN-06213: --------------- ---------------------------------------------------
    RMAN-06214: copy of the data /u01/app/oracle/product/11.2.0/db_1/dbs/snapcf_ORCLdr1.f file
    RMAN-06214: /u01/app/oracle/product/11.2.0/db_1/dbs/c-3171721304-20130514-00 piece of backup


    RMAN >
    RMAN >

    Complete recovery manager.
    -bash - $3.2

    Concerning
    Hitgon

    Published by: hitgon on May 20, 2013 02:09

    Published by: hitgon on May 20, 2013 02:15

    It contained a real data file? Or was it a backup controlfile? A backup controlfile may be outdated if another backup controlfile does not capture the same information it contains.

    Hemant K Collette

  • Estimate the size of backups rman &amp; time

    Hi DBAs,

    ENV: 11 GR 2, Windows Server 2008, 64-bit, = 12 GB RAM,

    DB size = 370 GB., CMS = 5 GB, EAMA = enabled.

    We need to move this database to the 2012 Windows Server that runs on Hyper-V.  You guys you will suggest what are the best methods to move with limited downtime?

    If we opt for RMAN, is it possible to measure to estimate the size of the backup? (at least, approximate size) and how long it takes to finish?

    Please, share your ideas!

    Thank you

    Hari

    IamHariKrishna wrote:

    Thank you sb92075. Like size, is it possible to estimate the time as well?

    Some, many, most of the professionals actually test before doing it for real & would be able to answer this question by themselves with appeals to foreigners to do their work for them, according to.

  • Only the 32 block RAMS and always showing error 3 used

    Hello

    I work on Photons counting upon arrival at DIO0. Short cut, there is a lot of data to come and I need to send it to the host as soon as possible. To do this, I used a FIFO extended target in a loop timed under unique bike and another target host FIFO taking this extended FIFO target data and send it to the host.

    According to the analysis that I did, I need FIFO to 600 000 elements Boolean deep target. This should be possible since I use an FPGA virtex-5 wx30 FPGA which has 32 (36kbits) block of RAM. However, when I increase the number of items in this requested FIFO, compiling just can't say that code does not fit into the FPGA while it shows that only 3 of the 32 RAM block have been used.

    I tried to search a lot on any restrictions on the FIFO, but I have not found.

    Please help me here earlier.

    I have attached the file VI and the sheet of newspaper of Xilinx compilation.

    There are 6 FIFOs in this project:

    The target host DMA (items I32, 1023)

    Target to host DMA (Boolean elements, 2000)

    Target to host DMA U32 (U32, 500)

    Range of target DMA write (I32, 16000)
    County of DMA scope target (Boolean elements, 108000)
    DMA County U32 brought target (U32, 500)

    There is a bug in the compiler to Xilinx that not all types of block instantiated Rams are reported.

    I did a similar discovery before.  http://forums.NI.com/T5/LabVIEW/FPGA-block-RAM-FIFO-resource-usage/m-p/2978897/highlight/true#M85572...

    Therefore, simply ignore the statistics of the compilation, they are wrong.

    Block of RAM is not addressable as 36 k x 1 bit, it has 36 bit width or width 72 bits.  This means that 1-bit, 2 bits, all the way to the top 36-bit all fill a cell block of RAM.

    Therefore, your consumption will be 600 k x 36 bit which gives much more than what you're supposed to be bit 1 x 60000 storage trequirement.

    1x600k is part of the block of 32x36k RAM (600 KB required, 1 MB free space)

    but the reality is that

    36x600k does not fit in the block of 32x36k Ram (21 MB required, 1 MB of free space).

    If you can, try little racing Booleans in one FXP 36 bits before writing in the block of RAM will improve you things.

  • How to remove the definition of backups RMAN of SBT without access to the Court?

    Hello

    I have a restore with RMAN scenario where I have a controlfile with many information backup (many backups) around 100-200.

    The last backup occurred at the target on the JOB, but now I need to restore from the last backup that is taken (at the level of the disc) and in the other node, because we like to clone the production database.

    Then all the info controlfile rman metadata is 'dirty '.

    Normally I do the following:

    New target site:

    I restore the backup controlfile.

    Then:

    overlap backupset;

    delete noprompt expired backupset;

    Now the news of rman controlfile are removed.

    Now, I save my RMAN backup.

    Catalog starts by ' / backup/test1 / '.

    To complete this control register and catalog my file rman backups in this case a backup set.

    After that, I start my restore and recover commands.

    The problem I found is: because the backups were taken to SBT to the target site, but in this site I have not access to the SBT, the work of does ' t crosschek.

    How can I fix it to remove rman controlfile 'old' backups done sbt?

    Thank you very much

    Arturo

    V$ BACKUP_SET query and generate a list of commands 'CHANGE BACKUPSET '?

    Hemant K Collette

  • Logical backup RMAN containing unused blocks

    Dear Experts

    When I backup logic to the data file of the utility, RMAN that warn that this will be also saved all the unused blocks of datafile, so what I need to do, how to avoid this unused block to be backed up while you are taking a logical backup of data files.

    System in detail as follows

    HP Itanium server
    OS - Linux Redhet 5
    DB - Oracle10g

    Suggest me urgent.

    Ikram,

    No I did not lack the full result. I noticed these lines, but I don't know which are the most recent. So I took the high ones.

    For these lines, we must say that the data blocks have been used when the backup took. Maybe you populated tables with the lines of the sample and then deleted?

    I changed the query to display backups the last 3 days:

    SELECT
    (SELECT NAME FROM V$DATAFILE WHERE FILE#=V$BACKUP_DATAFILE.FILE#) DFNAME,
    DATAFILE_BLOCKS, BLOCKS,
    DATAFILE_BLOCKS - BLOCKS DIFF,
    COMPLETION_TIME
    FROM V$BACKUP_DATAFILE WHERE COMPLETION_TIME > SYSDATE - 3
    ORDER BY COMPLETION_TIME, DFNAME;
    

    Could you run this query again?

    Best regards

    Gokhan Atil

    -------------------------------------------------------
    If you answer this question, please mark appropriate as correct/useful messages and the thread as closed. Thank you

  • I have to keep each backup set or only the most recent

    Original title: backup sets

    I use backup and restore to make a weekly backup of my files.  A new set of files is created every week, but the size varies.  Each new set of backup files is complete or each new lot only contains the updated items?  I have to keep each backup set or just the most recent?

    Hello

    It depends on what type of backup you do?

    If you did a full backup of the system simply perform a differential or incremental backup on a regular basis.

    Differential backup

    A differential backup copies files that were created or changed since the last normal or incremental backup. It does not mark files as having been backed up (in other words, archive attribute is not cleared). If you are performing a combination of normal and differential backups, restoring files and folders requires that you have the last normal and last differential backup.

    Incremental backup

    An incremental backup backs up only files that were created or changed since the last normal or incremental backup. It marks files as having been backed up (in other words, archive attribute is cleared). If you use a combination of normal and incremental backups, you will need to have the last normal backup set as well as all incremental backup sets to restore your data.

    http://TechNet.Microsoft.com/en-us/library/cc784306 (v = WS.10) .aspx

  • Creating a database with only the RMAN backup

    Hello

    I have a full backup of a database (10.2.0.1) of 10g RMAN in RHEL5 server. This backup has only the backup piece does not SP. and the control file. I want to create a new database with this backup in a new server. Is this possible? How to go further?

    Kind regards
    007

    Hello

    Refer to this that you can take a look at this http://shivanandarao.wordpress.com/2012/04/19/duplicating-primary-database-to-a-new-host-without-connecting-to-the-primary-database-in-oracle-10g11g/

    RMAN automatically backup spfile and controlfile in the backup of the data file 1 (SYSTEM datafile). So you can restore them from the backup piece which is to have the file system data.

    4.3.5 Backing Up Control Files with RMAN
    http://docs.oracle.com/cd/B19306_01/backup.102/b14192/bkup003.htm#i1009642
    

    Newbie
         
    Manage: 007
    Status level: Rookie (25)
    Join date: Oct 6, 2010
    Messages total: 272
    Total Questions: 154 (123 pending)
    Name Khanth
    Location India
    Occupation DBA Junior

    I feel unhappy when you do not close your son, if they have been answered. If you feel that the nets have been answered, then please consider closing them by providing appropriate points and marking them as answered. Please clean the forum!

    Kind regards
    Shivananda

  • Help remove backups rman (delete the repository)

    Hi all.

    I will soon be administering a few databases Oracle (11g Rel2). Currently these DBs area in log mode archive with a backup rman in place policy.


    I don't like this policy and you want to use my own, incremental backups from updadateable, so this is the plan I have in mind.


    (1) disable mode archive.


    (2) a clean shutdown and take a backup to cold.


    (3) since after you disable archiving, backups RMAN ALL will be unusable, I want to remove them (including newspapers archive and backup sets).


    (4) after the correct deletion, set up some persistent RMAN settings, such as retention policy, controlfile autobackup and optimization.


    (5) turn on archiving


    (6) to set up the new policy based backups backup incremental updateable with duplex location for archiving logs.


    Help is requested on the best way to clean all the backups (3).


    I can manually delete the backups and do overlap, but according to the Oracle Documentation "Delete backup" will be delete all backups for data recorded in the RMAN Repository.


    So which is the best way easier and faster? Will delete backup include the archive logs?


    Thanks in advance. Luis!


    myluism wrote:

    Can I still use them?

    I would say it is "the wrong answer to evil. When you disable log mode archive, you can only back up the database when it is stopped and only to restore and recover the database until the last stop.

    Looking at your plan, I wonder what you are trying to accomplish first log mode archive disabling and then enabling archive mode log again. Why do you think that this is necessary and what you're trying to accomplish.

    You need not disable and enable log mode archive in order to eliminate the obsolete achivelogs.

    If you are not satisfied with the retention policy, simply change it. All backups that are outside your retention policy will be considered as obsolete and you can remove them using RMAN delete obsolete, which will remove all files as well as the appropriate data backup from the RMAN Repository.

    For example you can archivelog delete all the entries backup and then delete the backupset or remove them at the OS level, do overlap and then use delete noprompt expired archivelog all.

    The retention policy applies to backup and archivelogs. However, you can have a separate archivelog deletion policy that applies to archivelogs.

  • The user managed based backup Rman backup cold cold vs

    Hi all

    I just want to know the advantages and disadvantages for backup managed user cold and cold backup Rman.

    What is the best cold backup?

    Some some can help me?

    Thank you

    Cedric Joshi

    Hello

    Both are good only... If you took the clod backup (managed by the user), you can also do with RMAN catalog.

    I feel clod RMAN backup is good.

    Reason:

    ======

    ++ with RMAN you can avoid used used block, you can only backup used blocks

    ++ RMAN has its own compression algorithm

    ++ We also have the ability to assign multiple channels to parallelize the backup

  • How to create the file controlf from scratch when there is no backup rman, catalog, or trace.

    Hello

    I am a beginner, I know that we can restore with RMAN control file configure automatic backup feature or by connecting the catalog

    charge the Alter database backup controlfile to trace.

    But suppose that there is no backup. You have the database running in nomount. I came across a blog which was responsible for creating the control file manually and when there is no planned block number error came, the blogger has used the forumale something as expected number of block * 1024 / something. Lost the link to this blog

    was wondering is it possible to create a controlfile from scratch. with little information as the location of the data file, repeat the log size / location.

    Please can someone let me know it in detail or shoot me this link!

    Thank you

    2638616 wrote:

    Hello

    I am a beginner, I know that we can restore with RMAN control file configure automatic backup feature or by connecting the catalog

    charge the Alter database backup controlfile to trace.

    But suppose that there is no backup. You have the database running in nomount. I came across a blog which was responsible for creating the control file manually and when there is no planned block number error came, the blogger has used the forumale something as expected number of block * 1024 / something. Lost the link to this blog

    was wondering is it possible to create a controlfile from scratch. with little information as the location of the data file, repeat the log size / location.

    Please can someone let me know it in detail or shoot me this link!

    Thank you

    1. Yes, you can do this

    2 Controlfile script is standard... link doc oracle: http://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_5003.htm

    3. prepare with the location of the data files and of redologs online then create it.

    Note - If you have placed the name of the different database, then, it will check with datafile and it give error (if you need correct the name of the database)

    As you have not indicated whether or not the last stop of database is compatible (we assume that there are his uniform and mandatory ORL and archives)

    -Pavan Kumar N

  • Restore the consistent backup RMAN

    Hi team,

    Please let me know how to restore only my consistent backup by RMAN?
    Example: Consistent Sunday incremental backup of level 0 keeping database state up and incremental backup of level 1 from Monday to Saturday.
    If my database a fall Tuesday, I want to restore only the consistent backup Sunday and open the database and I don't want to run the command for database recovery. (-> restore database alter database open). Please let me know how to do this in RMAN.

    Thank you
    RESTORE CONTROLFILE FROM 'backuppiece_containing_controlfilebackup';
    RESTORE DATABASE;
    RECOVER DATABASE NOREDO;
    ALTER DATABASE OPEN RESETLOGS;
    

    Hemant K Collette

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