Online Redo log file/ Archive Files

hi guyz,
is there any tool available for to view contents of redo log file, or archive file (WHAT"S INSIDE????)
i hope i've explained what i want
regards
neo

Dear Friend,
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and assistance with you in your company. It will be my gladness to go into a
possible investment co-operation with you in your company.If you are interested, do respond to me as soon as possible so that we
can discuss in greater details.Do have a nice day and I look forward to read from you, soon.
Sincerely,
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Similar Messages

  • Commit Completes although current online redo log file have been removed.

    Although i have removed current online redo log file in linux os (Oracle Linux),when i type "commit" it says that "commit complete".
    Is this fair for this princip?*:" if Only when all redo records associated with a given transaction are safely on disk in the online logs is the user process notified that the transaction has been committed."*
    I think that it can lead to loss of data in some cases..I'm using Oracle 11g R2 on OEL (x64)..
    Can anyone explain me ? I'm getting stuck in this situation..
    P.S : I haven't multiplexed current ORL group files...

    Javid wrote:
    Although i have removed current online redo log file in linux os (Oracle Linux),when i type "commit" it says that "commit complete".
    Is this fair for this princip?*:" if Only when all redo records associated with a given transaction are safely on disk in the online logs is the user process notified that the transaction has been committed."*
    I think that it can lead to loss of data in some cases..I'm using Oracle 11g R2 on OEL (x64)..
    Can anyone explain me ? I'm getting stuck in this situation..
    In *nix, a file that is open by a process isn't really deleted until the process that has it completes.  So even though you 'deleted' a redo log, oracle is still holding it.  As soon as you stop your database (maybe even as soon as the db does a log switch) the redo will really be gone and no longer available.  consider the implications for archive logging.
    P.S : I haven't multiplexed current ORL group files...You need to fix that. the online logs are the achilles heel of the database. That's why it is standard practice to multiplex them.

  • Purpose of ONLINE REDO LOG FILES - Media or Instance recovery or BOTH ?

    Hi
    Currently studying this topic for the 1z0-031 exam and am a little confused.
    my books (from instructor led class) say
    -redo logs are a mean to provide redo transactions in the event of a DATABASE recovery
    -redo log buffer gets flushed to redo log files to provide a recovery mechanism in case of MEDIA FAILURE
    Then it says
    -Online redo log files are used in a situation such as an INSTANCE FAILURE to recover uncommitted data which has not yet been written to the data files
    - online redo log files are used for RECOVERY only.
    Am i misunderstanding? Or are redo log files for both MEDIA and INSTANCE recovery? Or just INSTANCE ?
    confused....
    Amanjit

    Online Redo Log Files are used in a sense for both Media and Instance Recovery. If your database is in NoArchive Mode then you will only be able to use the Redo Log Files for instance recover. But if you are running in Archive Log Mode then Redo Log Files are archived and will allow you to recover from media failure.

  • What  is online redo log files???

    Dear All,
    I m bit confused with redo log files.what is need of back up of redo log files?????As i m new in the Basis please tell me i always get confused with redo log files and archive files.
    Thanx and reagard's
    Ashok

    In Oracle you have a number of online redo log files.
    In an typical SAP installation you have two directories:
    origlogA and origlogB
    origlogA contains online redo log 1 and 3 and
    origlogB contains online redo log 2 and 4.
    In most installation you also have mirrlogA and mirrlogB, which the name tells, is mirrors of origlogA and origlogB.
    Now, the online redo logs are circular,
    so when 1 gets full oracle jumps to number 2.
    At the same time oracle's archiver process starts to copy
    online redo log number 1 to a file on disk.
    This files are also known as archive redo logs.
    In an recovery situation you might do with just the online redo logs,
    but usually a combination of both online and archive redo logs is needed.
    During database backup, you also backup the online redo logs
    You also need to backup (backup twice then delete) archive redo logs.
    the archive redo logs are your way back from the restored database to the last transaction of the database.
    If one archive redo log is missing, you have to stop you recovery there and loose the rest of the transactions done in the database.

  • Moving the online redo log files to different location

    We just installed few more drives into our sandbox system and I want to move the online redo log files for better performance.  We've got the SAPARCH directory moved to a different location. 
    Does anyone know how/where I can change the parameters so redo log files are pointed at different drives?  It's not in the <b>init<SID>.ora</b> file...
    Regards,
    Sumit

    Hi Sumit,
    The following link contains information about moving the redo logs:
    http://www.stanford.edu/dept/itss/docs/oracle/9i/server.920/a96521/onlineredo.htm
    Best regards,
    Alwin

  • Physical Standby Online Redo log  files,

    Hi,
    I'm trying to create a physical standby database (10.2.0.3). I'm a little confused about the requirement for online redo logs on the standby.
    in my standby alert log I get the following when I issue:
    SQL> alter database recover managed standby database disconnect from session
    "ORA-00313: open failed for members of log group 1 of thread 1
    ORA-00312: online log 1 thread 1: '/appl/oradata/prod/prod_1_redo_01_02.log'
    ORA-27037: unable to obtain file status
    SVR4 Error: 2: No such file or directory
    Additional information: 3"
    /appl/oradata/prod/prod_1_redo_01_02.log is the path to the location of the online redo logs on the production system. This file does not exist on the standby filesystem so the error is correct.
    I assume that it gets this information from the standby control file I created on the production system and copied over to the standby.
    Do I need to copy the online redo logs from the primary over to the standby site or do I need to create online redo logs on the standby?
    Does the standby need to have redo log files?
    I'm not talking about 'standby log files' of the type created using 'alter database add standby log file'. I've not got that far yet.
    I just need to establish if a physical standby requires online redo log files?
    Thanks in advance,
    user234564

    I wanted to update this thread since I've been dealing with the exact same errors. The basic question is: "does a physical standby need the online redo logs?"
    Answer: Not really, until one wants to switchover or failover (and become a primary database). Furthermore, whenever the MRP process is started, Oracle prepares for a possible switchover/failover by "clearing" the online redo logs (MetaLink note# 352879.1). It is not a big deal, since Oracle will build the actual redo files when the "alter database open resetlogs" is accomplished during a "role transition."
    In our situation, we have decided to use our standby for nightly exports. We stop MRP, open the database read-only, then restart MRP. We built these standby DBs with RMAN. The RMAN duplicate process will not build the online redo log files until the database is opened for read/write (with resetlogs). However, we haven't had a need for read/write (i.e. a switchover).
    Thus, every morning we have been getting the same errors that "user234564" posted above. At first the errors seemed scary, then we realized they were just a nusiance. In order to clean things up, all I did was just "cp" our stanby redo logs (SRL) into our online redo directories ensuring the names matched what was in v$logfile. When I restarted MRP, the alert log clearly showed Oracle clearing these "newly found" online redo logs.

  • Status of online redo log file INVALID warning appears during online backup

    Hi All,
    I have a peculiar problem in one of the SAP ECC 6.0 systems. The daily online backup is getting completed with warnings.
    Please find below the warnings in DB12 logs:
    BR0335W Status of online redo log file /oracle/AS0/mirrlogB/log_g18m2.dbf is INVALID
    BR0274W File '/oracle/AS0/mirrlogB/log_g18m2.dbf' not found
    BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g50_m2.dbf is INVALID
    BR0274W File '/oracle/AS0/mirrlogA/log_g50_m2.dbf' not found
    BR0335W Status of online redo log file /oracle/AS0/mirrlogB/log_g51_m2.dbf is INVALID
    BR0274W File '/oracle/AS0/mirrlogB/log_g51_m2.dbf' not found
    BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g52_m2.dbf is INVALID
    BR0274W File '/oracle/AS0/mirrlogA/log_g52_m2.dbf' not found
    BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g53_m2.dbf is INVALID
    BR0274W File '/oracle/AS0/mirrlogA/log_g53_m2.dbf' not found
    BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g54_m2.dbf is INVALID
    BR0274W File '/oracle/AS0/mirrlogA/log_g54_m2.dbf' not found
    BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g55_m2.dbf is INVALID
    BR0274W File '/oracle/AS0/mirrlogA/log_g55_m2.dbf' not found
    BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g56_m2.dbf is INVALID
    BR0274W File '/oracle/AS0/mirrlogA/log_g56_m2.dbf' not found
    BR0335W Status of online redo log file /oracle/AS0/mirrlogB/log_g57_m2.dbf is INVALID
    BR0274W File '/oracle/AS0/mirrlogB/log_g57_m2.dbf' not found
    BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g58_m2.dbf is INVALID
    BR0274W File '/oracle/AS0/mirrlogA/log_g58_m2.dbf' not found
    BR0335W Status of online redo log file /oracle/AS0/mirrlogB/log_g59_m2.dbf is INVALID
    BR0274W File '/oracle/AS0/mirrlogB/log_g59_m2.dbf' not found
    For the above mentioned alerts I followed the recommendations of SAP Note 491160. I dropped and recreated the mirrorlog files. But the next day again when I checked the backup it finished with warnings. At the database level there is no problem
    SQL> select * from v$logfile;
        GROUP# STATUS  TYPE
    MEMBER
    IS_
            59         ONLINE
    /oracle/AS0/origlogB/log_g59_m1.dbf
    NO
            59         ONLINE
    /oracle/AS0/mirrlogB/log_g59_m2.dbf
    NO
        GROUP# STATUS  TYPE
    MEMBER
    IS_
            58         ONLINE
    /oracle/AS0/origlogA/log_g58_m1.dbf
    NO
            58         ONLINE
    /oracle/AS0/mirrlogA/log_g58_m2.dbf
        GROUP# STATUS  TYPE
    MEMBER
    IS_
    NO
            57         ONLINE
    /oracle/AS0/origlogB/log_g57_m1.dbf
    NO
            57         ONLINE
        GROUP# STATUS  TYPE
    MEMBER
    IS_
    /oracle/AS0/mirrlogB/log_g57_m2.dbf
    NO
            56         ONLINE
    /oracle/AS0/origlogA/log_g56_m1.dbf
    NO
        GROUP# STATUS  TYPE
    MEMBER
    IS_
            56         ONLINE
    /oracle/AS0/mirrlogA/log_g56_m2.dbf
    NO
            55         ONLINE
    /oracle/AS0/origlogA/log_g55_m1.dbf
    NO
            54         ONLINE
    /oracle/AS0/origlogA/log_g54_m1.dbf
        GROUP# STATUS  TYPE
    MEMBER
    IS_
    NO
            54         ONLINE
    /oracle/AS0/mirrlogA/log_g54_m2.dbf
    NO
            53         ONLINE
        GROUP# STATUS  TYPE
    MEMBER
    IS_
    /oracle/AS0/origlogA/log_g53_m1.dbf
    NO
            53         ONLINE
    /oracle/AS0/mirrlogA/log_g53_m2.dbf
    NO
        GROUP# STATUS  TYPE
    MEMBER
    IS_
            52         ONLINE
    /oracle/AS0/origlogA/log_g52_m1.dbf
    NO
            52         ONLINE
    /oracle/AS0/mirrlogA/log_g52_m2.dbf
    NO
        GROUP# STATUS  TYPE
    MEMBER
    IS_
            51         ONLINE
    /oracle/AS0/origlogB/log_g51_m1.dbf
    NO
            51         ONLINE
    /oracle/AS0/mirrlogB/log_g51_m2.dbf
        GROUP# STATUS  TYPE
    MEMBER
    IS_
    NO
            50         ONLINE
    /oracle/AS0/origlogA/log_g50_m1.dbf
    NO
            50         ONLINE
        GROUP# STATUS  TYPE
    MEMBER
    IS_
    /oracle/AS0/mirrlogA/log_g50_m2.dbf
    NO
             8         ONLINE
    /oracle/AS0/origlogB/log_g18m1.dbf
    As you can see from the above output at the database level everything is fine. So why during backup it is giving me warnings in DB12. Any help with this regard will be appreciated.
    Regards
    Mitesh Nair

    Hi Joe,
    My OS is HP-UX. I dont think its a permission problem. Please find below the contents of origlogA and mirrlogA
    predbci2:/oracle/AS0/origlogA#ls -rtl
    total 1433712
    drwxrwxrwx   2 oraas0     dba             96 Oct 15 03:27 cntrl
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 01:50 log_g52_m1.dbf
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 03:51 log_g50_m1.dbf
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 05:51 log_g54_m1.dbf
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 07:52 log_g53_m1.dbf
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 09:50 log_g55_m1.dbf
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 10:50 log_g56_m1.dbf
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 12:41 log_g58_m1.dbf
    predbci2:/oracle/AS0/mirrlogA#ls -rtl
    total 1433728
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 01:50 log_g52_m2.dbf
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 03:51 log_g50_m2.dbf
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 05:51 log_g54_m2.dbf
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 07:52 log_g53_m2.dbf
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 09:50 log_g55_m2.dbf
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 10:50 log_g56_m2.dbf
    -rw-rw----   1 oraas0     dba        104858624 Dec  4 12:41 log_g58_m2.dbf
    Regards
    Mitesh

  • Accidently Deleted Online Redo Log Files

    Dear friends
    Just to give a try, I deleted online redo log files from the disk after clearn shutdown (In Test Environment Not A Production Database), then i started the dabase, I know we need atleast two online redo files for database to work properly. now my point of question is how can i create new online redo files ?
    I have 2 redo logfile groups each with one member. In group 2 i have added new member for the deleted one using add logfile member ....... to group 2. but when i try todo the same to add logfile member to group1 I am not abale to do so. because its saying that this is the current logfile member. then I tried manual log switching to use next logfile member but database is not allowing as the database is just mounted not opened. plsease if any body helps me out to sort out this problem it will be a great help.
    Anandkumar S.M
    Oracle DBA
    rC6Exv3

    hello ur instruction u have is some what bit rite. but i was not able to solve the problem
    finally i solved the problem with these commands after database is mounted
    recover database until cancel Enter
    then I select the cancel option when it provide the user with the options
    after cancelling the recover i issued the following command
    alter database open resetlogs;
    this method sorted out my problem
    anyway very very thanks for ur root hints from where i got the Idea to recover online redo logfiles
    Thank u very much

  • Non-multiplexed online redo log file damaged

    how to fix if non-multiplexed online redo log file damaged , looking for info for both current & inactive..

    If you only want to practice your skills these are good scenarios to do it. But if you are currently facing this problem then you are in big troubles if it happens to be the CURRENT. When this issue appears I suggest you not to shutdown the instance you should be aware that information written on the redo log is the backup of the running transactions in memory. If both get lost data is lost, if either one survives your chances to recover data are high.
    ~ Madrid
    http://hrivera99.blogspot.com

  • Optimal online redo log file size

    hello to all,
    I have installed just now 11gr2 patching 2.
    I found
    The Redo Logfile Size Advisor can be used to determine the least optimal online redo log file size based on the current FAST_START_MTTR_TARGET setting and MTTR statistics.
    Which means that Redo Logfile Size Advisor is enabled only if FAST_START_MTTR_TARGET is set.
    for now this installation is not a production instance (only for my testing) I am still on 10g
    my question is:
    is't important to set FAST_START_MTTR_TARGET, in 11g or that all old infos?, because from my query I see OPTIMAL_LOGFILE_SIZE isn't set.
    SELECT TARGET_MTTR,ESTIMATED_MTTR,WRITES_MTTR,WRITES_LOGFILE_SIZE, OPTIMAL_LOGFILE_SIZE FROM V$INSTANCE_RECOVERY;TARGET_MTTR     ESTIMATED_MTTR     WRITES_MTTR     WRITES_LOGFILE_SIZE     OPTIMAL_LOGFILE_SIZE
    0     20     0     0
    and
    SELECT a.group#, b.member, a.status, a.bytes
    FROM v$log a, v$logfile b
    WHERE a.group#=b.group#
    GROUP#     MEMBER     STATUS     BYTES
    6     /u03/oradata/TEST/redo06.log     CURRENT     1048576000
    5     /u03/oradata/TEST/redo05.log     INACTIVE     1048576000
    4     /u03/oradata/TEST/redo04.log     INACTIVE     1048576000
    3     /u03/oradata/TEST/redo03.log     INACTIVE     1048576000
    2     /u03/oradata/TEST/redo02.log     INACTIVE     1048576000
    1     /u03/oradata/TEST/redo01.log     INACTIVE     1048576000
    thanks for any doc or info you will pointing me

    for now this installation is not a production instance (only for my testing) I am still on 10g
    my question is:
    is't important to set FAST_START_MTTR_TARGET, in 11g or that all old infos?,There is no difference for FAST_START_MTTR_TARGET in 10g and 11g.
    For 10g
    http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams068.htm#i1127412
    For 11g
    http://download.oracle.com/docs/cd/B28359_01/server.111/b28320/initparams079.htm
    Both documentation have exact text, means it will work exactly in 11g as 10g.
    But do'nt see this like (because its not a official documentation link... as it is different from official doc's text though)
    http://www.stanford.edu/dept/itss/docs/oracle/10g/server.101/b10755/initparams069.htm
    Regards
    Girish Sharma

  • What is the difference between undo tablespace and online redo log files.

    what is the difference between undo tablespace and online redo log files. I am confused
    as per my knowledge undo tablespace is used to store the undo information when a table is being updated so that, just incase we need to rollback a transaction we know what was present in the table earlier.
    when a transaction fails the SMON performs the rollback of the data.
    This undo data is stored in the undo tablespace and read consistency if any is enforced.
    is my understanding till here correct?
    Now, can this undo data/before image not be stored in the redo log buffer and online redolog files?
    can redo-log files not store this information?
    in fact, is it that when undo tablespaces exist in a database, the undo data/before image is stored in both the undo tablespace and also the redo log files?
    kindly clarify my doubt.
    thank you.

    This question has been asked many times before. The answer is always the same.
    Yes, redo contains the before image of data (and the after-image). Therefore, it **COULD** be used to roll back a transaction.
    BUT... Redo is written sequentially. Using it to rollback your transaction would involve reading through all the redo written by maybe thousands of other people. It would be painfully slow.
    Your transaction is, however, directly linked to just the UNDO that it generates (which is JUST the before image of the data). So, your undo is your undo and doesn't share space with anyone else's undo. Therefore, using it to roll back YOUR transaction is fast.
    The fact that undo is only the before image of the data also makes it faster than wading through a sea of before and AFTER images as you'd find in redo. About twice as fast, in fact, since there's half the data. Roughly.
    Redo also gets written and flushed to disk whenever there's a commit, 3 seconds are up or too much (1MB, actually) redo gets generated between flushes caused by other factors. Your redo gets flushed when those things happen, even if you haven't actually committed your transaction. And redo logs recycle themselves, meaning that your redo -even if your transaction hasn't been committed yet- can be over-written by later transactions. Try rolling back when that's happened, if redo was the source of your rollback data!
    Undo, however, cannot be over-written if the transaction has not been committed. Ever. If you don't commit for three years, there will be three years' undo stored in your database (assuming you had the space, of course!).
    I could go on, but that will do. Redo is there fore RECOVERY, after catastrophe. Undo is there for read-consistency (and the occasional change of mind). Two different functions. Two different mechanisms. Each one highly tuned to doing what it does, why it does it, most efficiently and effectively.

  • When occurs crash recovery,why use active online redo log not archived log?

    If current redo log had archived, but it's still 'ACTIVE'. As we all know, archived log is just an archived copy of the current redo log which is still 'ACTIVE', they have the same data. But why use active online redo log not archived log for crash recovery?(I think, if crash recovery can use archived log, then whether the online redo log is 'ACTIVE' or not, it can be overwritten)
    Quote:
    Re: v$log : How redo log file can have a status ACTIVE and be already archived?
    Hemant K Chitale
    If your instance crashes, Oracle attempts Instance Recovery -- reading from the Online Redo Logs. It doesn't need ArchiveLogs for Instance Recovery.
    TanelPoder
    Whether the log is already archived or not doesn't matter here, when the instance crashes, Oracle needs some blocks from that redolog. Archivelog is just an archived copy of the redolog, so you could use either the online or achive log for the recovery, it's the same data in there (Oracle reads the log/archivelog file header when it tries to use it for recovery and validates whether it contains the changes (RBA range) in it what it needs).

    Aman.... wrote:
    John,
    Are you sure that the instance recovery (not the media recovery) would be using the archived redo logs? Since the only thing that would be lost is the isntance, there wouldn't be any archived redo log generated from the Current redo log and the previous archived redo logs, would be already checkpointed to the data file, IMHO archived redo logs won't participate in the instance recovery process. Yep, shall watch the video but tomorrow .
    Regards
    Aman....
    That's what I said. Or meant to say. If Oracle used archivelogs for instance recovery, it would not be possible to recover in noarchive log mode. So recovery relies exclusively on the online log.
    Sorry I wasted your time, I'll try to be less ambiguous in future

  • Online redo log files being removed physically

    Grid Infra version: 11.2.0.4
    RDBMS Version: 11.2.0.4
    Although this is a RAC DB, this is not a RAC-specific question. Hence posting it here.
    Few months back, I remember issuing a command similair to below (DROP LOGFILE GROUP ...) and the redo log files were still physically present in the diskgroup.
    If I remember correctly, the file is not deleted physical so that we can use the REUSE functionality (ALTER DATABASE ADD LOGFILE MEMBER '+REDO/orcl/onlinelog/redo1b.log' reuse to group 11; ) ie. you can use the REUSE command to add the logfile of the same name which is physically present in OS Filesystem/Diksgroup to redo log group.
    But today, after I issued the below command, I checked the diskgroup location from ASMCMD
    SQL> alter database drop logfile group 31;
    Database altered.
    From ASMCMD, I can that the file has disappeared physically. Is this a new feature with 11.2.0.4 or am I missing something here ?
    ASMCMD> ls +DATA/msblprd/onlinelog/group_31.548.833154995
    ASMCMD-8002: entry 'group_31.548.833154995' does not exist in directory '+DATA/msblprd/onlinelog/'

    Just to add to what Aman has said.
    It is a bad practice not to let OMF decide the placement of Online redo logs because of this issue especially when you use ASM.
    Executing rm command in Linux/Unix is easy but Dropping ASM aliases in the disk group can be a hassle.
    This is documented.
    "When a redo log member is dropped from the database, the operating system file is not deleted from disk. Rather, the control files of the associated database are updated to drop the member from the database structure. After dropping a redo log file, ensure that the drop completed successfully, and then use the appropriate operating system command to delete the dropped redo log file."
    http://docs.oracle.com/cd/E11882_01/server.112/e25494/onlineredo.htm#ADMIN11324
    BTW . You don't even need to set  db_create_online_log_dest_n to enable OMF for ORLs.
    SQL> show parameter log_dest
    NAME                                 TYPE        VALUE
    db_create_online_log_dest_1          string
    db_create_online_log_dest_2          string
    db_create_online_log_dest_3          string
    db_create_online_log_dest_4          string
    db_create_online_log_dest_5          string
    SQL> show parameter db_create_file_dest
    NAME                                 TYPE        VALUE
    db_create_file_dest                  string      +MBL_DATA
    alter database add logfile thread 4
    group 31 ('+MBL_DATA','+MBL_FRA') size 4096M,
    group 32 ('+MBL_DATA','+MBL_FRA') size 4096M,
    group 33 ('+MBL_DATA','+MBL_FRA') size 4096M,
    group 34 ('+MBL_DATA','+MBL_FRA') size 4096M ;
    Database altered.
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                          +MBL_FRA/bsblprd/onlinelog/group_34.359.832605481  UNUSED           YES

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