What if all the redo logs of a database are lost

I want to know how a database can be recovered if all the three redo logs are lost at the same time.
Thanks,
Prabhath.

You will be able to find the detail procedures of this kind of recover here:
Backup and Recovery Concepts Contents / Search / Index / PDF
Backup and Recovery Documentation Online Roadmap Contents / Search / /
Recovery Manager Quick Reference Contents / Search / / PDF
Recovery Manager Reference Contents / Search / Index / PDF
Recovery Manager User's Guide Contents / Search / Index / PDF
http://otn.oracle.com/pls/db92/db92.docindex?remark=homepage
if you are making backups to the database using RMAN the recover is easier.
Joel Pérez

Similar Messages

  • Redo logs and Flash recovery area

    Hi,
    Is it a good practice to place a copy of the (multiplexed) online redo at the flash recovery area? Wouldn't it be better to place a copy of the archived log at the flash recovery area?

    user492400 wrote:
    Hi,
    Is it a good practice to place a copy of the (multiplexed) online redo at the flash recovery area? Wouldn't it be better to place a copy of the archived log at the flash recovery area?Its not only the archvielogs that should be placed in the FRA. FRA is supposed to contain one copy of the archive logs and the rest 9 destinations are given to you for the multiplexing of it. The idea of multiplexing the redo logs and placing them anywhere( not just on the FRA itself) is simply required so that you won't get to a situation where you would lose all the redo log files and thus have to recreate them, losing the data inside them. So aleast one copy of the log files should be there and where you want to put it, that would depend on you.
    HTH
    Aman....

  • Where all the redo/archive log volume come from?

    Hi,
    I have a database with a size of around 50G. Thats not very much, but the crazy thing is that this database has a redo log volume per day that is nearly equal the size of the database:
    -- Daily View
    SQL> SELECT TRUNC(completion_time) AS time, ROUND(SUM(blocks * block_size)/1024/1024,2) AS size_mb, ROUND(SUM(blocks * block_size)/1024/1024/1024,2) AS size_gb FROM v$archived_log GROUP BY TRUNC(completion_time) ORDER BY 1 DESC;
    TIME          SIZE_MB    SIZE_GB
    2013-02-03    49599.7      48.44
    2013-02-02   50104.63      48.93
    2013-02-01   54466.36      53.19
    2013-01-31   52935.41      51.69
    2013-01-30   51596.85      50.39
    -- Hourly View
    SQL> SELECT TRUNC(completion_time,'HH24') AS time, ROUND(SUM(blocks * block_size)/1024/1024,2) AS size_mb, ROUND(SUM(blocks * block_size)/1024/1024/1024,2) AS size_gb FROM v$archived_log GROUP BY TRUNC(completion_time,'HH24') ORDER BY 1 DESC;
    TIME          SIZE_MB    SIZE_GB
    2013-02-03 23     160.68        .16
    2013-02-03 22     163.73        .16
    2013-02-03 21     195.65        .19
    2013-02-03 20    4492.44       4.39
    2013-02-03 19      176.3        .17
    2013-02-03 18     4259.8       4.16
    2013-02-03 17     226.99        .22
    2013-02-03 16    5465.64       5.34
    2013-02-03 15     166.47        .16
    2013-02-03 14     165.05        .16
    2013-02-03 13     253.33        .25
    2013-02-03 12    9568.93       9.34
    2013-02-03 11     391.14        .38
    2013-02-03 10    9585.36       9.36
    2013-02-03 09     160.02        .16
    2013-02-03 08      200.1         .2
    2013-02-03 07     166.66        .16
    2013-02-03 06     267.45        .26
    2013-02-03 05     309.26         .3
    2013-02-03 04    1486.87       1.45
    2013-02-03 03   11106.77      10.85
    2013-02-03 02      318.1        .31
    2013-02-03 01     147.47        .14
    2013-02-03 00     165.47        .16
    2013-02-02 23     160.17        .16
    2013-02-02 22     159.25        .16
    2013-02-02 21      205.9         .2
    2013-02-02 20    4473.27       4.37
    2013-02-02 19     124.64        .12
    2013-02-02 18    4364.69       4.26
    2013-02-02 17     295.02        .29
    2013-02-02 16    5415.06       5.29
    2013-02-02 15     166.22        .16
    2013-02-02 14     166.83        .16
    2013-02-02 13      84.62        .08
    2013-02-02 12    9905.55       9.67
    2013-02-02 11     418.31        .41
    2013-02-02 10    9548.78       9.32
    2013-02-02 09     166.51        .16
    2013-02-02 08     204.88         .2
    2013-02-02 07     167.37        .16I know that every database change produces redo, but why that much?
    Is there a way to investigate further where all the redo information comes from?
    Every 2 hours redo is backed up to tape.
    There are no significant batches, shaking and shuffling the data around all the time.
    Nearly all changes in this database is happening through user inputs.
    Database is 11gR2 on Redhat 5.6.
    Thanks
    941743
    Edited by: 941743 on 04.02.2013 15:32
    Edited by: 941743 on 04.02.2013 15:33

    I am afraid there is no easy and direct way to pull the answer from the data dictionary.
    But with some work, you can get to the bottom of this.
    This query shows you how much redo is used by the sessions in your system currently:
    select a.sid , a.value  from v$sesstat a,  v$statname b
    where a.statistic# = b.statistic#
    and b.name = 'redo size'Unfortunately, I am not aware of a AWR view (license required!) that corresponds to v$sesstat, so it would not be easy to look back and see which session generated the redo.
    One way is to troubleshoot the problem online, using a utility such as snapper- http://blog.tanelpoder.com/2010/03/22/oracle-session-snapper-v3-10/ . See which sessions generate most redo and see what SQL they are running at that time.
    The other way is to create your own “repository”. Sample V$SESSION, v$sesstat , v$statname and possibly V$SQL frequently (every few seconds) and record how much redo and what SQLs are running by each session. Once you gather enough data, look which sessions had the biggest “redo size” delta and what SQL were they running at that time.
    Iordan Iotzov
    http://iiotzov.wordpress.com/

  • Bottleneck when switching the redo log files.

    Hello All,
    I am using Oracle 11.2.0.3.
    The application team reported that they are facing slowness at certain time.
    I monitored the database and I found that at some switching of the redo log files (not always) I am facing a slowness at the application level.
    I have 2 threads since my database is RAC, each thread have 3 redo log groups multiplexed to the FRA, with size 300 MB each.
    Is there any way to optimize the switch of redo log files? knowing that my database is running in ARCHIVELOG mode.
    Regards,

    Hello Nikolay,
    Thanks for your input I am sharing with you the below information. I have 2 instances so I will provide the info from each instance
    Instance 1:
    Load Profile              Per Second    Per Transaction   Per Exec   Per Call
    ~~~~~~~~~~~~         ---------------    --------------- ---------- ----------
          DB Time(s):                4.9                0.0       0.00       0.00
           DB CPU(s):                1.1                0.0       0.00       0.00
           Redo size:        3,014,876.2            3,660.4
       Logical reads:           32,619.3               39.6
       Block changes:            7,969.0                9.7
      Physical reads:                0.2                0.0
    Physical writes:              164.0                0.2
          User calls:            7,955.4                9.7
              Parses:              288.9                0.4
         Hard parses:               96.0                0.1
    W/A MB processed:                0.2                0.0
              Logons:                0.9                0.0
            Executes:            2,909.4                3.5
           Rollbacks:                0.0                0.0            
    Instance 2:
    Load Profile              Per Second    Per Transaction   Per Exec   Per Call
    ~~~~~~~~~~~~         ---------------    --------------- ---------- ----------
          DB Time(s):                5.5                0.0       0.00       0.00
           DB CPU(s):                1.4                0.0       0.00       0.00
           Redo size:        3,527,737.9            3,705.7
       Logical reads:           29,916.5               31.4
       Block changes:            8,893.7                9.3
      Physical reads:                0.2                0.0
    Physical writes:              194.0                0.2
          User calls:            7,742.8                8.1
              Parses:              262.7                0.3
         Hard parses:               99.5                0.1
    W/A MB processed:                0.4                0.0
              Logons:                1.0                0.0
            Executes:            2,822.5                3.0
           Rollbacks:                0.0                0.0
        Transactions:              952.0
    Instance 1:
    Top 5 Timed Foreground Events
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                                               Avg
                                                              wait   % DB
    Event                                 Waits     Time(s)   (ms)   time Wait Class
    DB CPU                                            1,043          21.5
    log file sync                       815,334         915      1   18.9 Commit
    gc buffer busy acquire              323,759         600      2   12.4 Cluster
    gc current block busy               215,132         585      3   12.1 Cluster
    enq: TX - row lock contention        23,284         264     11    5.5 Applicatio
    Instance 2:
    Top 5 Timed Foreground Events
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                                               Avg
                                                              wait   % DB
    Event                                 Waits     Time(s)   (ms)   time Wait Class
    DB CPU                                            1,340          24.9
    log file sync                       942,962       1,125      1   20.9 Commit
    gc buffer busy acquire              377,812         594      2   11.0 Cluster
    gc current block busy               211,270         488      2    9.1 Cluster
    enq: TX - row lock contention        30,094         299     10    5.5 Applicatio
    Instance 1:
    Operating System Statistics        Snaps: 1016-1017
    -> *TIME statistic values are diffed.
       All others display actual values.  End Value is displayed if different
    -> ordered by statistic type (CPU Use, Virtual Memory, Hardware Config), Name
    Statistic                                  Value        End Value
    AVG_BUSY_TIME                             17,451
    AVG_IDLE_TIME                             81,268
    AVG_IOWAIT_TIME                                1
    AVG_SYS_TIME                               6,854
    AVG_USER_TIME                             10,548
    BUSY_TIME                                420,031
    IDLE_TIME                              1,951,741
    IOWAIT_TIME                                  288
    SYS_TIME                                 165,709
    USER_TIME                                254,322
    LOAD                                           3                6
    OS_CPU_WAIT_TIME                         523,000
    RSRC_MGR_CPU_WAIT_TIME                         0
    VM_IN_BYTES                              311,280
    VM_OUT_BYTES                          75,862,008
    PHYSICAL_MEMORY_BYTES             62,813,896,704
    NUM_CPUS                                      24
    NUM_CPU_CORES                                  6
    NUM_LCPUS                                     24
    NUM_VCPUS                                      6
    GLOBAL_RECEIVE_SIZE_MAX                4,194,304
    GLOBAL_SEND_SIZE_MAX                   4,194,304
    TCP_RECEIVE_SIZE_DEFAULT                  16,384
    TCP_RECEIVE_SIZE_MAX      9.2233720368547758E+18
    TCP_RECEIVE_SIZE_MIN                       4,096
    TCP_SEND_SIZE_DEFAULT                     16,384
    TCP_SEND_SIZE_MAX         9.2233720368547758E+18
    TCP_SEND_SIZE_MIN                          4,096
    Operating System Statistics - Detail  Snaps: 1016-101
    Snap Time           Load    %busy    %user     %sys    %idle  %iowait
    22-Aug 11:33:55      2.7      N/A      N/A      N/A      N/A      N/A
    22-Aug 11:50:23      6.2     17.7     10.7      7.0     82.3      0.0
    Instance 2:
    Operating System Statistics         Snaps: 1016-1017
    -> *TIME statistic values are diffed.
       All others display actual values.  End Value is displayed if different
    -> ordered by statistic type (CPU Use, Virtual Memory, Hardware Config), Name
    Statistic                                  Value        End Value
    AVG_BUSY_TIME                             11,823
    AVG_IDLE_TIME                             86,923
    AVG_IOWAIT_TIME                                0
    AVG_SYS_TIME                               4,791
    AVG_USER_TIME                              6,991
    BUSY_TIME                                475,210
    IDLE_TIME                              3,479,382
    IOWAIT_TIME                                  410
    SYS_TIME                                 193,602
    USER_TIME                                281,608
    LOAD                                           3                6
    OS_CPU_WAIT_TIME                         615,400
    RSRC_MGR_CPU_WAIT_TIME                         0
    VM_IN_BYTES                               16,360
    VM_OUT_BYTES                          72,699,920
    PHYSICAL_MEMORY_BYTES             62,813,896,704
    NUM_CPUS                                      40
    NUM_CPU_CORES                                 10
    NUM_LCPUS                                     40
    NUM_VCPUS                                     10
    GLOBAL_RECEIVE_SIZE_MAX                4,194,304
    GLOBAL_SEND_SIZE_MAX                   4,194,304
    TCP_RECEIVE_SIZE_DEFAULT                  16,384
    TCP_RECEIVE_SIZE_MAX      9.2233720368547758E+18
    TCP_RECEIVE_SIZE_MIN                       4,096
    TCP_SEND_SIZE_DEFAULT                     16,384
    TCP_SEND_SIZE_MAX         9.2233720368547758E+18
    TCP_SEND_SIZE_MIN                          4,096
    Operating System Statistics - Detail Snaps: 1016-101
    Snap Time           Load    %busy    %user     %sys    %idle  %iowait
    22-Aug 11:33:55      2.6      N/A      N/A      N/A      N/A      N/A
    22-Aug 11:50:23      5.6     12.0      7.1      4.9     88.0      0.0
              -------------------------------------------------------------

  • What will heppen if redo logs at os level get deleted

    Friends,
    need 1 answer about the query: what will heppen if redo logs at os level get deleted.

    how can i find where are my multiplexed redo logs, so that i can copy it from there
    SQL> shutdown abort                       
    ORACLE instance shut down.                
    SQL> startup mount                        
    ORACLE instance started.                  
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    Fixed Size                  2256912 bytes 
    Variable Size             398462960 bytes 
    Database Buffers          125829120 bytes 
    Redo Buffers                7913472 bytes 
    Database mounted.                         
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    IS_                                       
             3         ONLINE                 
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    NO                                        
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    C:\O\ORADATA\XE\REDO02.LOG                
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             1         ONLINE                 
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    Smirh

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  • GoldenGate : Why to read all the Redo or Archive, can't we skip ??

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  • Sizing the redo log files using optimal_logfile_size view.

    Regards
    I have a specific question regarding logfile size. I have deployed a test database and i was exploring certain aspects with regards to selecting optimal size of redo logs for performance tuning using optimal_logfile_size view from v$instance_recovery. My main goal is to reduce the redo bytes required for instance recovery. Currently i have not been able to optimize the redo log file size. Here are the steps i followed:-
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    NAME TYPE VALUE
    fast_start_mttr_target               integer                           0
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    NAME TYPE VALUE
    log_checkpoint_interval integer 0
    log_checkpoint_timeout integer 1800
    log_checkpoints_to_alert boolean FALSE
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    log_checkpoint_timeout               integer                           0
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    276 165888 *93* 59 361 16040
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    SQL> alter system set fast_start_mttr_target=120 scope=both;
    System altered.
    Now the logfile size suggested by v$instance_recovery is 290 Mb
    SQL> select ACTUAL_REDO_BLKS,TARGET_REDO_BLKS,TARGET_MTTR,ESTIMATED_MTTR, OPTIMAL_LOGFILE_SIZE,CKPT_BLOCK_WRITES from v$instance_recovery;
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    59 165888 93 59 290 16080
    After altering the logfile size to 290 as show below by v$log view :-
    SQL> select GROUP#,THREAD#,SEQUENCE#,BYTES from v$log;
    GROUP# THREAD# SEQUENCE# BYTES
    1 1 24 304087040
    2 1 0 304087040
    3 1 0 304087040
    4 1 0 304087040
    5 ) After altering the size i have observed the anomaly as redo log blocks to be applied for recovery has increased from *59 to 696* also now v$instance_recovery view is now suggesting the logfile size 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
    Please clarify the above output i am unable to optimize the logfile size and have not been able to achieve the goal of reducing the redo log blocks to be applied for recovery, any help is appreciated in this regard.

    sunny_123 wrote:
    Sir oracle says that fast_start_mttr target can be set to 3600 = 1hour. As suggested by following oracle document
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    I set mine value to 1200 = 20 minutes. Later i adjusted it to 120=2 minutes as Target_mttr suggested it to be around 100 (if fast_mttr_target value is too high or too low effective value is contained in target_mttr of v$instance_recovery)Just to add, you are reading the documentation of 9.2 and a lot has changed since then. For example, in 9.2 the parameter FSMTTR was introduced and explicitly required to be set and monitored by the DBA for teh additional checkpoint writes which might get caused by it. Since 10g onwards this parameter has been made automatically maintained by Oracle. Also it's been long that 9i has been desupported followed by 10g so it's better that you start reading the latest documentation of 11g and if not that, at least of 10.2.
    Aman....

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