Full log files are available to LGWR for reuse

Hello

Oracle version:
Oracle Database 10g Release 10.2.0.4.0-
OS: Windows XP

In oracle, documentation, noted that:

Filled log files are available to LGWR for re-use if archiving is enabled.

* > If archiving is disabled (the database is in NOARCHIVELOG mode), a full redo log file is available after changes in it have been written to the data files *.


Link for Documentation is:
http://docs.Oracle.com/CD/B28359_01/server.111/b28310/onlineredo001.htm
My doubt is:
Redo records are written in files of data also?

user12141893 wrote:
This means:
Suppose that:
Files redo log Online contains some redo entries and cache buffers data base contains data and these data belong to redo entries to the redo log files.
Now this redo log file cannot be reused until the (related) blocks of the database buffer cache are written to the data files.

It's sort of OK. If the log file should be filled, LGWR could switch to the next group of newspapers and would launch a Log Switch that would also trigger DBWR to launch the script of checking the content protected by this newspaper group in the data file. At the time, this operation would go, newspapers group members would have the status of assets , and once it is complete, the State would be marked inactive , which means that this group of newspapers and its members may be reused by LGWR.

HTH
Aman...

Tags: Database

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      1    88      3294064    03-SEP-09 3323611    03-SEP-09
      1    89      3323611    03-SEP-09 3352060    04-SEP-09
      1    90      3352060    04-SEP-09 3399516    04-SEP-09
      1    91      3399516    04-SEP-09 3440740    04-SEP-09
      1    92      3440740    04-SEP-09 3457884    05-SEP-09
      1    93      3457884    05-SEP-09 3485157    05-SEP-09
      1    94      3485157    05-SEP-09 3523208    05-SEP-09
      1    95      3523208    05-SEP-09 3558325    05-SEP-09
      1    96      3558325    05-SEP-09 3600414    06-SEP-09
      1    97      3600414    06-SEP-09 3642729    06-SEP-09
      1    98      3642729    06-SEP-09 3678479    07-SEP-09
      1    99      3678479    07-SEP-09 3720642    07-SEP-09
      1    100     3720642    07-SEP-09 3748794    07-SEP-09
      1    101     3748794    07-SEP-09 3777963    08-SEP-09
      1    102     3777963    08-SEP-09 3823393    08-SEP-09
      1    103     3823393    08-SEP-09 3865230    08-SEP-09
      1    104     3865230    08-SEP-09 3880510    09-SEP-09
      1    105     3880510    09-SEP-09 3906888    09-SEP-09
      1    106     3906888    09-SEP-09 3961086    09-SEP-09
      1    107     3961086    09-SEP-09 3982103    10-SEP-09
      1    108     3982103    10-SEP-09 4034528    10-SEP-09
      1    109     4034528    10-SEP-09 4055556    11-SEP-09
      1    110     4055556    11-SEP-09 4115268    11-SEP-09
      1    111     4115268    11-SEP-09 4128557    12-SEP-09
      1    112     4128557    12-SEP-09 4165104    12-SEP-09
      1    113     4165104    12-SEP-09 4202850    12-SEP-09
      1    114     4202850    12-SEP-09 4258353    13-SEP-09
      1    115     4258353    13-SEP-09 4298900    14-SEP-09
      1    116     4298900    14-SEP-09 4341046    14-SEP-09
      1    117     4341046    14-SEP-09 4365180    15-SEP-09
      1    118     4365180    15-SEP-09 4424992    15-SEP-09
      1    119     4424992    15-SEP-09 4439538    15-SEP-09
      1    120     4439538    15-SEP-09 4489259    16-SEP-09
      1    121     4489259    16-SEP-09 4532807    16-SEP-09
      1    122     4532807    16-SEP-09 4548893    17-SEP-09
    
    
    
    and when i try
    
    RMAN> backup archivelog from sequence 30 until sequence 66;
    
    Starting backup at 17-SEP-09
    using channel ORA_DISK_1
    RMAN-00571: ===========================================================
    RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
    RMAN-00571: ===========================================================
    RMAN-03002: failure of backup command at 09/17/2009 04:01:25
    RMAN-20242: specification does not match any archive log in the recovery catalog
    
    
    when i try to restore database on testing server it ask me for
    
    
    
    MAN> recover database until sequence 121;
    
    Starting recover at 17-SEP-09
    using channel ORA_DISK_1
    
    starting media recovery
    
    channel ORA_DISK_1: starting archive log restore to default destination
    channel ORA_DISK_1: restoring archive log
    archive log thread=1 sequence=37
    channel ORA_DISK_1: restoring archive log
    archive log thread=1 sequence=38
    channel ORA_DISK_1: restoring archive log
    archive log thread=1 sequence=39
    channel ORA_DISK_1: reading from backup piece /home/oracle/o1_mf_annnn_TAG20090827T061019_59dpwfkb_.bkp
    channel ORA_DISK_1: restored backup piece 1
    piece handle=/home/oracle/o1_mf_annnn_TAG20090827T061019_59dpwfkb_.bkp tag=TAG20090827T061019
    channel ORA_DISK_1: restore complete, elapsed time: 00:00:17
    channel ORA_DISK_1: starting archive log restore to default destination
    channel ORA_DISK_1: restoring archive log
    archive log thread=1 sequence=63
    channel ORA_DISK_1: restoring archive log
    archive log thread=1 sequence=64
    channel ORA_DISK_1: restoring archive log
    archive log thread=1 sequence=65
    channel ORA_DISK_1: restoring archive log
    archive log thread=1 sequence=66
    channel ORA_DISK_1: reading from backup piece /home/oracle/o1_mf_annnn_TAG20090827T222915_59gj7x0o_.bkp
    channel ORA_DISK_1: restored backup piece 1
    piece handle=/home/oracle/o1_mf_annnn_TAG20090827T222915_59gj7x0o_.bkp tag=TAG20090827T222915
    channel ORA_DISK_1: restore complete, elapsed time: 00:00:15
    channel ORA_DISK_1: starting archive log restore to default destination
    channel ORA_DISK_1: restoring archive log
    archive log thread=1 sequence=31
    channel ORA_DISK_1: restoring archive log
    archive log thread=1 sequence=32
    channel ORA_DISK_1: restoring archive log
    archive log thread=1 sequence=33
    channel ORA_DISK_1: reading from backup piece /home/oracle/o1_mf_annnn_TAG20090828T012913_59gtsbdk_.bkp
    channel ORA_DISK_1: restored backup piece 1
    piece handle=/home/oracle/o1_mf_annnn_TAG20090828T012913_59gtsbdk_.bkp tag=TAG20090828T012913
    channel ORA_DISK_1: restore complete, elapsed time: 00:00:07
    archive log filename=/home/oracle/DataBaseBackups/ArchiveDest/1_31_694492901.dbf thread=1 sequence=31
    archive log filename=/home/oracle/DataBaseBackups/ArchiveDest/1_32_694492901.dbf thread=1 sequence=32
    archive log filename=/home/oracle/DataBaseBackups/ArchiveDest/1_33_694492901.dbf thread=1 sequence=33
    archive log filename=/home/oracle/DataBaseBackups/ArchiveDest/1_34_694492901.dbf thread=1 sequence=34
    archive log filename=/home/oracle/DataBaseBackups/ArchiveDest/1_34_694492901.dbf thread=1 sequence=35
    RMAN-00571: ===========================================================
    RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
    RMAN-00571: ===========================================================
    RMAN-03002: failure of recover command at 09/17/2009 03:01:31
    RMAN-11003: failure during parse/execution of SQL statement: alter database recover logfile '/home/oracle/DataBaseBackups/ArchiveDest/1_34_694492901.dbf'
    ORA-00310: archived log contains sequence 34; sequence 35 required
    ORA-00334: archived log: '/home/oracle/DataBaseBackups/ArchiveDest/1_34_694492901.dbf'
    My question is why my 30 to 66 sequence archivelog file are not saved with the database in v$ archived_log and how to solve this problem.

    Thank you
    Umesh

    You may need to increase the CONTROL_FILE_RECORD_KEEP_TIME value.

    If the archivelogs are still on the disk, you can try to catalog them with:

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    or if you don't need the file you can simply remove the o/s and run the following:

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    1 how to recover the database and put online

    Any help will be much appreciated.

    Regarding
    Hemant Joshi

    Published by: hem_Kec on 7 Sep 2008 09:07

    Hello

    It is actually quite easy.
    We knew that Oracle was looking for logsequence 1107. There is no archived log, it was deleted, or it has never generated. As you delete files, the 1st solution would be possible, BUT as there was only an instance crash so more old archived logs is not required for crash recovery. There is a need during the restoration of the old backup files, which is not our case.

    Thus, the missing log sequence has not been archived = > it is a redo log.
    To identify the required online redo log, we just to log query v$ as I suggest.

    Once the log identified file, we can recover it by specifying the redo log when you ask logsequence 1107.

    And it is on. We win! :)

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    Hello Experts,

    I read articles on the log redo and undo segment files. I was wondering something very simple. That redo log files waiting in there? It stores the sql statements?

    Lets say that my update statement to modify 800 blocks of data. A unique single update statement can modify different data 800 right blocks? Yes, it may be true. I think that these data blocks can not hold buffers to the log to roll forward, right? I mean I know exactly what to do redo log buffer and redo log file. And I know that the task of backgrounding LGWR. But, I wonder if she she holds the data blocks? It is not supposed to hold data like cache buffer blocks, right?

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    Here's my question:

    My second question is, rollback isn't effect to restore the newspaper to the right buffer? Because it does not need log buffer for effect do it again. Conversely, the restoration; statement is included in the restore log buffer by progression when someone isse, am I right?

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    I hope that I am wrong so far?

    Not sure why you even the buffer log roll forward for Rollback? This is the reason why I asked you it was for, where occurs the dose the cancellation? And the answer for this is that it happens in the buffer cache. Before you worry about the drivers of change, you must understand that it is not serious what contains where as long as there is no transaction recorded in the operating of the Undo segment table. If the operating table indicates that the transaction is longer there, there must be a cancellation of the transaction. Vectors of change are saved in the file log roll forward, while the restore happens on blocks of data stored in the file "data" undo blocks stored in the undo file "data".

    At the same time I read an article about redo and undo. In this article process transaction is explained. Here is the link http://pavandba.files.wordpress.com/2009/11/undo_redo1.pdf

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    It is worth noting that during the restore process, recovery logs never participate. The only time where redo logs are read is retrieving and archiving. This is the concept of tuning key: redo logs are written on. Oracle does not read during normal processing. As long as you have sufficient devices so that when the ARC is reading a file, LGWR's writing to a different device, then there no contention for redo logs.

    If redo logs are never involved in the restoration process, how is it Oracle will then know the order of the transaction? As far as I know it is only written in redo logs.

    I have thoughts very amazed to Aman.

    Why you ask?

    Now, before giving a response, I say two things. One, I know Pavan and he is a regular contributor to this forum and on several other forums Facebook and two, with all due respect to him, a little advice for you, when you try to understand a concept, to stick to the Oracle documentation and do not read and merge articles/blog-posts from the web. Everone, which publishes on the web, has their own way to express things and many times, the context of the writing makes it more confusing things. Maybe we can erase the doubts that you can get after reading the various search results on the web.

    Redo logs used for the restoration, not to restore. The reason is the redo log files are applied in sequential order, and this is not the case when we look for the restoration. A restore is required to do for a few blocks away. Basically, what happens in a restoration, is that the records of cancellation required for a block of data are sought in the reverse order of their creation. The entry of the transaction is in the slot ITL of the block of data that point to the necessary undo bytes Address (UBA) using which oracle also knows what that undo the blocks would be necessary for the restoration of your transaction. As soon as the blocks of data will be cancelled, the ITL slots would be cleared as well.

    In addition, you must remember, until the transaction is not qualified as finished, using either a commit or a rollback, the cancellation of this data would remain intact. The reason for this is that oracle would ensure that undo data would be available to make the cancellation of the transaction. The reason why Undo data are also recorded in the journals of recovery is to ensure that in the event of the loss of the cancellation of the data file, retrieving them would be possible. Because it would also require changes that's happened on the blocks cancel, restore the vectors change associated with blocks of cancellation are also saved in the buffer log roll forward and, in the redo log files.

    HTH

    Aman...

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