REDO LOG STOP TRANSPORT MARITIMES TO THE BACKUP SITE

Hi guru,.

After physical creation Eve redologs are shipped and applied to standby mode. But suddenly stopped shipping redo log. I checked the main site from the log file it log archiving generates here but that is not delivered to the backup site. As I checked the pwd file is same on both sites, so I am able to connect to the db of the main site backup site.

Can any of clarify you why it happens so.

Thanks in advance

From point 1 to 3, I check that all are defined

But for pt 4 when I run the above command is as below:

STATE ERROR

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

VALID

DISABLED ORA - 16057:DGID OF THE SERVER NOT IN THE CONFIG OF DATA HOLD

OK, I got the error where is is LOG_ARCHIVE_CONFIG check box enabled on db primary

I correct and now delivery is correct, but one thing which still confuse me, is that when I run the command to check the archiev applied

SEQUENCE # FIRST_TIME NEXT_TIME APP

APP COLUMN ALWAYS SHOWS NO standby, as well as on the primary, but before it shows why Yes

Tags: Database

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    ------------------------------------ --------------------------------- ------------------------------
    fast_start_mttr_target integer 0

    (2) setting the fast_start_mttr_target requires destroy deferred to the following parameters: -.
    SQL > show parameter log_checkpoint;

    VALUE OF TYPE NAME
    ------------------------------------ --------------------------------- ------------------------------
    log_checkpoint_interval integer 0
    log_checkpoint_timeout around 1800
    log_checkpoints_to_alert boolean FALSE

    SQL > select ISSES_MODIFIABLE, ISSYS_MODIFIABLE, ISINSTANCE_MODIFIABLE, ISMODIFIED parameter of $ v where name like 'log_checkpoint_timeout;

    ISSES_MODIFIABL ISSYS_MODIFIABLE ISINSTANCE_MODI ISMODIFIED
    --------------- --------------------------- --------------- ------------------------------
    IMMEDIATE FALSE TRUE FALSE

    SQL > alter system set log_checkpoint_timeout = 0 scope = both;

    Modified system.

    SQL > show parameter log_checkpoint_timeout;

    VALUE OF TYPE NAME
    ------------------------------------ --------------------------------- ------------------------------
    log_checkpoint_timeout integer 0

    (3) setting fast_start_mttr_target now

    SQL > select ISSES_MODIFIABLE, ISSYS_MODIFIABLE, ISINSTANCE_MODIFIABLE, ISMODIFIED parameter of $ v where name like 'fast_start_mttr_target;

    ISSES_MODIFIABL ISSYS_MODIFIABLE ISINSTANCE_MODI ISMODIFIED
    --------------- --------------------------- --------------- ------------------------------
    IMMEDIATE FALSE TRUE FALSE

    Definition of the fast_mttr_target to 1200 = 20 minutes of the control point of switching on the recommendation of the Oracle

    Ask the view v instance_recovery $

    (4) SQL > select ACTUAL_REDO_BLKS, TARGET_REDO_BLKS, TARGET_MTTR, ESTIMATED_MTTR, OPTIMAL_LOGFILE_SIZE, CKPT_BLOCK_WRITES from v$ instance_recovery;

    ACTUAL_REDO_BLKS TARGET_REDO_BLKS TARGET_MTTR ESTIMATED_MTTR OPTIMAL_LOGFILE_SIZE CKPT_BLOCK_WRITES
    ---------------- ---------------- ----------- -------------- -------------------- -----------------
    276 165888 * 93 * 59 361 16040

    Here target MTTR was 93 so I put the fast_mttr_target to 120

    SQL > alter system set fast_start_mttr_target = 120 scope = both;

    Modified system.

    The size of the log file suggested by v$ instance_recovery is now 290 MB

    SQL > select ACTUAL_REDO_BLKS, TARGET_REDO_BLKS, TARGET_MTTR, ESTIMATED_MTTR, OPTIMAL_LOGFILE_SIZE, CKPT_BLOCK_WRITES from v$ instance_recovery;

    ACTUAL_REDO_BLKS TARGET_REDO_BLKS TARGET_MTTR ESTIMATED_MTTR OPTIMAL_LOGFILE_SIZE CKPT_BLOCK_WRITES
    ---------------- ---------------- ----------- -------------- -------------------- -----------------
    59 165888 93 59 290 16080

    After you change the size of the logfile to 290 as indicated below by v$ log view;

    SQL > select GROUP #, THREAD #, SEQUENCE #, BYTES of the log v$.

    GROUP # THREAD # SEQUENCE # BYTES
    ---------- ---------- ---------- ----------
    1 1 24 304087040
    2 1 0 304087040
    3 1 0 304087040
    4 1 0 304087040
    (5) after you change the size, I observed the anomaly as redo log blocks to be applied for the recovery went to * $ 59 to 696 * v instance_recovery view is now also now offers the size of the log file of * 276 MB *. Have I misunderstood something

    SQL > select ACTUAL_REDO_BLKS, TARGET_REDO_BLKS, TARGET_MTTR, ESTIMATED_MTTR, OPTIMAL_LOGFILE_SIZE, CKPT_BLOCK_WRITES from v$ instance_recovery;

    ACTUAL_REDO_BLKS TARGET_REDO_BLKS TARGET_MTTR ESTIMATED_MTTR OPTIMAL_LOGFILE_SIZE CKPT_BLOCK_WRITES
    ---------------- ---------------- ----------- -------------- -------------------- -----------------
    * 696 * 646947 120 59 * 276 * 18474

    If please specify the output above, that I'm unable to optimize the size of the log file and have not been able to achieve the goal of reducing the redo log blocks to apply for recovery, any help is appreciated in this regard.

    I don't think that test for the optimum size of redo's CTD. Maybe if you did each week, as a regular or something, but the unique initial setup and sometimes check in production? N ° but it will be iterative as part of a deployment of init.ora Exchange.

    In addition, it is part of the DBA job to understand the recovery and what to expect. Which includes the understanding of all these parameters, init and tests for the environment. It also includes an understanding of the characteristics of the application and its load.

  • Question about how Oracle manages the Redo logs

    Hello

    Assuming a configuration which consists of 2 redo log groups (groups A and B), each group of 2 disks (disks A1 and A2 for Group A) and B1 and B2 disks for Group B. Additionally, assume that each redo log file resides by itself in a disk storage device and that the device is dedicated to her. So in the situation described above, there are 4 discs, one for each redo log file, and each disc contains nothing other than a redo log file. Also, assume that the database is in ARCHIVELOG mode and the files from archive is stored on another different set of devices.

    kind of graphically:
        GROUP A             GROUP B

      A1                  B1
      A2                  B2
    The question is: when the disks that make up the Group A are filled and Oracle switches to the disks in the Group B, can the group drives to take offline, perhaps even physically removed from the system if necessary without affecting the functioning of the database? Can the archiver process temporarily delayed until the disks (which have been removed) are presented online or is the DBA have to wait until the end of the process to archive a copy of the redo log file creating in archive?

    Thank you for your help,

    John.

    Hello
    A journal of the groups fall

    To remove a group of online redo logs, you must have the ALTER DATABASE system privilege. Before you delete a line redo log group, consider the following precautions and restrictions:

    * An instance requires at least two groups of files logging online, regardless of the number of members in the groups. (A group is one or more members.)
    * You can delete a group of newspapers online redo only if it is inactive. If you need to drop the current group, first force a log switch occurs.
    * Make sure a group of online redo logs is archived (if archiving is enabled) before dropping. To see if this happens, use the view LOG V$.

    SELECT GROUP #, ARCHIVED, STATUS FROM V$ LOG;

    GROUP # ARC STATUS
    --------- --- ----------------
    1 ACTIVE YES
    2. NO CURRENT
    3 INACTIVE YES
    4 INACTIVE YES

    Delete a group of newspapers online redo with the SQL ALTER DATABASE statement with the DROP LOGFILE clause.

    The following statement drops redo log group number 3:

    ALTER DATABASE, DROP LOGFILE GROUP 3;

    When a group of online redo logs is deleted from the database, and you do not use Oracle managed files, operating system files are not removed from the disk. Instead, control of the associated database files are updated to remove members of the Group of the database structure. After deleting a group of online redo logs, make sure the drop completed successfully and then use the command of operating system appropriate to delete the dropped online redo log files.

    When you work with files managed by Oracle, the cleaning of operating system files is done automatically for you.
    Your database will not be affected as you can work with 2 files, redo log in each group, as the minimum number of redo log in a database file is two because the process LGWR (newspaper writer) writes in the redo log in a circular way. If the process crashes because you have 2 groups only if you want to remove 1 Add a third and make that the current group and remove the one you want to be offline.

    Please refer to:
    http://download.Oracle.com/docs/CD/B10500_01/server.920/a96521/onlineredo.htm#7438
    Kind regards
    Mohamed
    Oracle DBA

  • Question about the size of the redo log buffer

    Hello

    I am a student in Oracle and the book I use says that having a bigger than the buffer log by default, the size is a bad idea.

    It sets out the reasons for this are:

    >
    The problem is that when a statement COMMIT is issued, part of the batch validation means to write the contents of the buffer log for redo log to disk files. This entry occurs in real time, and if it is in progress, the session that issued the VALIDATION will be suspended.
    >

    I understand that if the redo log buffer is too large, memory is lost and in some cases could result in disk i/o.

    What I'm not clear on is, the book makes it sound as if a log buffer would cause additional or IO work. I would have thought that the amount of work or IO would be substantially the same (if not identical) because writing the buffer log for redo log files is based on the postings show and not the size of the buffer itself (or its satiety).

    Description of the book is misleading, or did I miss something important to have a larger than necessary log buffer?

    Thank you for your help,

    John.

    Published by: 440bx - 11 GR 2 on August 1st, 2010 09:05 - edited for formatting of the citation

    A commit evacuates everything that in the buffer redolog for redo log files.
    A redo log buffer contains the modified data.
    But this is not just commit who empty the redolog buffer to restore the log files.
    LGWR active every time that:
    (1) a validation occurs
    (2) when the redo log is 1/3 full
    (3) every 3 seconds
    It is not always necessary that this redolog file will contain validated data.
    If there is no commit after 3 seconds, redologfile would be bound to contain uncommitted data.

    Best,
    Wissem

  • Loss of all Redo Log files

    Hello

    It's for testing purposes and practice of recovery scenarios. Database is in log mode archive. My question would be on the scenario in which we loose that redo all online log files available.

    Now after doing a lot of research on the internet I could find two scenarios.

    CASES1

    My recovery logs have been lost. But I could stop normal or immediate of the database. In this case I could perform incomplete recovery using my archived logs and re create the logs online redo with the resetlogs option.

    CAS2 (my question)

    My recovery logs have been lost and the system crashed. Now, oracle would need perform a recovery of proceeding on re start, however there is no present setpoint recovery to perform this restore.

    Is it not possible to recover the database, even if I have a valid backup? If there is, how do you do that?

    Thank you

    If you lose all copies of online redo logs, you lost all those transactions. Data files may or may not have some or all of the data of those redo logs. You need restore the database and retrieve it at the point in time of the last series of archive logs (at the latest) and go from there.

    But guess what? Oracle expected that someone might have a question like that, and actually (gasp) has documented the scenario:

    http://docs.Oracle.com/CD/B19306_01/backup.102/b14191/recoscen.htm#i1006437

  • ORA-38754: FLASHBACK DATABASE not started; required redo log is not available

    Hello

    I am getting below error when executing the activities of flashback. Currently we have backups, so when I tried the command flashback in RMAN my question solved.

    But if I want to do the same thing using SQLPLUS what steps should I take?

    ERROR:

    ORA-38754: FLASHBACK DATABASE not started; required redo log is not available

    ORA-38762: redo logs needed for SNA to SNA 20062842936 20062842926

    ORA-38761: redo log sequence 4 in thread 2, 65 incarnation cannot

    consulted

    DATABASE:11.2.0.3.0 (UAT)

    RMAN will automatically restore logs archived redo required for the operation of blowback when they are not present on the drive, while (as meyssoun said) when using sqlplus required archived redo logs must be available on the disc.

    Concerning

    AJ

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