Functioning of control file when re-created

Hi friends,
we can recover database without data loss when there is a situation to re-create control file(for suppose control file is lost and no multiplexed copies are available) using NORESETLOGS option in controlfile script.
when we re-create controlfile, no SCN and checkpoint information will be there in controlfile. Then how controlfile will get the latest SCN and how it allows DB to be up and running.
please explain. thanks in advance

Hi,
As per my knowledge I am explaning what will happen at Background.
As you said that control File is lost and no mutiplexed, In that scenario you are going to recreate the Controlfile. As we know that control file will be in Sync with All DataFiles (System etc.,) , which will hold the SCN numbers, When the Instance is UP with the newly Created ControlFile (Since scn is not available), it will get the Highest SCN Number from Current DataFiles and Check for in Sync with other Datafiles, whether SCN is in Sync with the Other data files or not.
And further proceed with Recovery Process Based on the Redo Logs.
As you said if the required SCN is not available in the Redo Logs it will Check for the Archive Redo Logs Based on the SCN i.e., (If Req SCN is < SCN in Redo Logs) It will Check for Archive Logs files.
Let me know in case If I am not clear or some where wrong in concept so that I can learn some thing inturn from others.!!
Thanks & Regards,
Pavan Kumar N

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    (name #4) /s01/flash_recovery_area/G10R21/onlinelog/o1_mf_1_7ch813h5_.log
    Thread 1 redo log links: forward: 2 backward: 0
    siz: 0x19000 seq: 0x00000001 hws: 0x4 bsz: 512 nab: 0xb6 flg: 0x0 dup: 2
    Archive links: fwrd: 2 back: 0 Prev scn: 0x0000.00000000
    Low scn: 0x0000.00e7784f 03/09/2012 23:11:46
    Next scn: 0x0000.00e77902 03/09/2012 23:11:54
    LOG FILE #2:
    (name #1) /s01/oradata/G10R21/onlinelog/o1_mf_2_7ch8144q_.log
    (name #2) /s01/flash_recovery_area/G10R21/onlinelog/o1_mf_2_7ch815cj_.log
    Thread 1 redo log links: forward: 3 backward: 1
    siz: 0x19000 seq: 0x00000002 hws: 0x1 bsz: 512 nab: 0xffffffff flg: 0xa dup: 2
    Archive links: fwrd: 0 back: 1 Prev scn: 0x0000.00e7784f
    Low scn: 0x0000.00e77902 03/09/2012 23:11:54
    Next scn: 0xffff.ffffffff 01/01/1988 00:00:00
    LOG FILE #3:
    (name #5) /s01/oradata/G10R21/onlinelog/o1_mf_3_7ch816g2_.log
    (name #6) /s01/flash_recovery_area/G10R21/onlinelog/o1_mf_3_7ch817gp_.log
    Thread 1 redo log links: forward: 0 backward: 2
    siz: 0x19000 seq: 0x00000000 hws: 0x2 bsz: 512 nab: 0x2 flg: 0x1 dup: 2
    Archive links: fwrd: 0 back: 0 Prev scn: 0x0000.00000000
    Low scn: 0x0000.00000000 01/01/1988 00:00:00
    Next scn: 0x0000.00000000 01/01/1988 00:00:00
    原来这个
    00e77902 =》 15169794 来源于 current online redo logfile中最小的LOW SCN
    DATA FILE RECORDS
    (size = 428, compat size = 428, section max = 100, section in-use = 19,
    last-recid= 0, old-recno = 0, last-recno = 0)
    (extent = 1, blkno = 11, numrecs = 100)
    DATA FILE #1:
    (name #22) /s01/oradata/G10R21/datafile/o1_mf_system_7ch8004t_.dbf
    creation size=0 block size=8192 status=0x12 head=22 tail=22 dup=1
    tablespace 0, index=1 krfil=1 prev_file=0
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    Checkpoint cnt:2314 scn: 0x0000.00e77916 03/09/2012 23:12:46
    Stop scn: 0xffff.ffffffff 03/09/2012 23:16:58
    Creation Checkpointed at scn: 0x0000.00000008 10/22/2005 21:44:31
    thread:0 rba:(0x0.0.0)
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    ORA-00279: change 15169814 generated at 03/09/2012 23:12:46 needed for thread 1
    ORA-00289: suggestion :
    /s01/flash_recovery_area/G10R21/archivelog/2012_03_09/o1_mf_1_2_%u_.arc
    ORA-00280: change 15169814 for thread 1 is in sequence #2
    Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
    ORA-00279: change 15169814 generated at 03/09/2012 23:12:46 needed for thread 1
    可以看到 recover database using backup controlfile 的起点是 15169814 即 最小的一个 datafile header 的CHECKPOINT CHANGE#，
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    我们在看一下 RESETLOGS的情况：
    SQL>
    SQL> CREATE CONTROLFILE REUSE DATABASE "G10R21" RESETLOGS ARCHIVELOG
    MAXLOGFILES 16
    2 3 MAXLOGMEMBERS 3
    4 MAXDATAFILES 100
    5 MAXINSTANCES 8
    6 MAXLOGHISTORY 2921
    7 LOGFILE
    8 GROUP 1 (
    9 '/s01/oradata/G10R21/onlinelog/o1_mf_1_7ch812dg_.log',
    10 '/s01/flash_recovery_area/G10R21/onlinelog/o1_mf_1_7ch813h5_.log'
    11 ) SIZE 50M,
    12 GROUP 2 (
    13 '/s01/oradata/G10R21/onlinelog/o1_mf_2_7ch8144q_.log',
    14 '/s01/flash_recovery_area/G10R21/onlinelog/o1_mf_2_7ch815cj_.log'
    15 ) SIZE 50M,
    16 GROUP 3 (
    17 '/s01/oradata/G10R21/onlinelog/o1_mf_3_7ch816g2_.log',
    18 '/s01/flash_recovery_area/G10R21/onlinelog/o1_mf_3_7ch817gp_.log'
    19 ) SIZE 50M
    20 -- STANDBY LOGFILE
    21 DATAFILE
    22 '/s01/oradata/G10R21/datafile/o1_mf_system_7ch8004t_.dbf',
    23 '/s01/oradata/G10R21/datafile/o1_mf_undotbs1_7ch80081_.dbf',
    '/s01/oradata/G10R21/datafile/o1_mf_sysaux_7ch8004x_.dbf',
    24 25 '/s01/oradata/G10R21/datafile/o1_mf_users_7ch80085_.dbf',
    26 '/s01/oradata/G10R21/datafile/o1_mf_example_7ch81ch3_.dbf',
    27 '/s01/oradata/G10R21/datafile/o1_mf_users_7gvd5pwh_.dbf',
    28 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6fdt_.dbf',
    29 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6nxy_.dbf',
    30 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6qc2_.dbf',
    31 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6stt_.dbf',
    32 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6w5w_.dbf',
    33 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6yo0_.dbf',
    34 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t717x_.dbf',
    35 '/s01/oradata/G10R21/datafile/o1_mf_undotbs1_7h6ttkkx_.dbf',
    36 '/s01/oradata/G10R21/datafile/o1_mf_undotbs1_7h6ttpn1_.dbf',
    37 '/s01/oradata/G10R21/datafile/o1_mf_undotbs1_7h6ttsbd_.dbf'
    CHARACTER SET AL32UTF8; 38
    Control file created.
    SQL> oradebug setmypid;
    Statement processed.
    SQL> oradebug dump controlf 3;
    Statement processed.
    SQL> oradebug tracefile_name;
    DATABASE ENTRY
    (size = 316, compat size = 316, section max = 1, section in-use = 1,
    last-recid= 0, old-recno = 0, last-recno = 0)
    (extent = 1, blkno = 1, numrecs = 1)
    03/09/2012 23:20:03
    DB Name "G10R21"
    Database flags = 0x00400147 0x00001000
    Controlfile Creation Timestamp 03/09/2012 23:20:03
    Incmplt recovery scn: 0x0000.00e77932
    Resetlogs scn: 0x0000.00e7784f Resetlogs Timestamp 03/09/2012 23:11:46
    Prior resetlogs scn: 0x0000.00e77780 Prior resetlogs Timestamp 03/09/2012 22:57:44
    Redo Version: compatible=0xa200100
    #Data files = 16, #Online files = 16
    Database checkpoint: Thread=0 scn: 0x0000.00000000
    Threads: #Enabled=1, #Open=0, Head=0, Tail=0
    REDO THREAD RECORDS
    (size = 256, compat size = 256, section max = 8, section in-use = 1,
    last-recid= 0, old-recno = 0, last-recno = 0)
    (extent = 1, blkno = 9, numrecs = 8)
    THREAD #1 - status:0x6 thread links forward:0 back:0
    #logs:3 first:1 last:3 current:3 last used seq#:0x0
    enabled at scn: 0x0000.00000000 01/01/1988 00:00:00
    disabled at scn: 0x0000.00000000 01/01/1988 00:00:00
    opened at 01/01/1988 00:00:00 by instance
    Checkpointed at scn: 0x0000.00000000
    thread:0 rba:(0x0.0.0)
    LOG FILE RECORDS
    (size = 72, compat size = 72, section max = 16, section in-use = 3,
    last-recid= 0, old-recno = 0, last-recno = 0)
    (extent = 1, blkno = 10, numrecs = 16)
    LOG FILE #1:
    (name #5) /s01/oradata/G10R21/onlinelog/o1_mf_1_7ch812dg_.log
    (name #6) /s01/flash_recovery_area/G10R21/onlinelog/o1_mf_1_7ch813h5_.log
    Thread 1 redo log links: forward: 2 backward: 0
    siz: 0x19000 seq: 0x00000000 hws: 0x0 bsz: 512 nab: 0x0 flg: 0x1 dup: 2
    Archive links: fwrd: 0 back: 0 Prev scn: 0x0000.00000000
    Low scn: 0x0000.00000000 01/01/1988 00:00:00
    Next scn: 0x0000.00000000 01/01/1988 00:00:00
    LOG FILE #2:
    (name #3) /s01/oradata/G10R21/onlinelog/o1_mf_2_7ch8144q_.log
    (name #4) /s01/flash_recovery_area/G10R21/onlinelog/o1_mf_2_7ch815cj_.log
    Thread 1 redo log links: forward: 3 backward: 1
    siz: 0x19000 seq: 0x00000000 hws: 0x0 bsz: 512 nab: 0x0 flg: 0x1 dup: 2
    Archive links: fwrd: 0 back: 0 Prev scn: 0x0000.00000000
    Low scn: 0x0000.00000000 01/01/1988 00:00:00
    Next scn: 0x0000.00000000 01/01/1988 00:00:00
    LOG FILE #3:
    (name #1) /s01/oradata/G10R21/onlinelog/o1_mf_3_7ch816g2_.log
    (name #2) /s01/flash_recovery_area/G10R21/onlinelog/o1_mf_3_7ch817gp_.log
    Thread 1 redo log links: forward: 0 backward: 2
    siz: 0x19000 seq: 0x00000000 hws: 0x0 bsz: 512 nab: 0x2 flg: 0xb dup: 2
    Archive links: fwrd: 0 back: 0 Prev scn: 0x0000.00000000
    Low scn: 0x0000.00000000 01/01/1988 00:00:00
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    虽然database checkpoint scn 等都是0 ，但是不影响 从 最小的datafile header checkpoint change 开始recover的 结论。
    SQL> recover database using backup controlfile;
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    ORA-00289: suggestion :
    /s01/flash_recovery_area/G10R21/archivelog/2012_03_09/o1_mf_1_2_%u_.arc
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    Variable Size                             788529152 bytes 
    Database Buffers                       459022446 bytes
    Redo Buffers                                1335296 bytes
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      db_block_checksum        = FALSE
      db_block_size            = 8192
      compatible               = 9.2.0
      log_archive_start        = TRUE
      log_archive_dest         = /oracle/P47/saparch/P47arch
      log_buffer               = 1048576
      log_checkpoint_interval  = 0
      db_files                 = 354
      db_file_multiblock_read_count= 8
      log_checkpoints_to_alert = TRUE
      control_file_record_keep_time= 30
      dml_locks                = 2500
      row_locking              = always
      replication_dependency_tracking= FALSE
      transactions_per_rollback_segment= 20
      rollback_segments        = PRS_0, PRS_1, PRS_10, PRS_11, PRS_12, PRS_13, PRS_14, PRS_2, PRS_3, PRS_4, PRS_5, PRS_6, PRS_7, PRS_8, PRS_9
      transaction_auditing     = FALSE
      remote_os_authent        = TRUE
      db_domain                = world
      parallel_max_servers     = 20
      hash_join_enabled        = FALSE
      background_dump_dest     = /oracle/P47/saptrace/background
      user_dump_dest           = /oracle/P47/saptrace/usertrace
      core_dump_dest           = /oracle/P47/saptrace/background
      optimizer_features_enable= 9.2.0
      sort_area_size           = 2097152
      sort_area_retained_size  = 0
      db_name                  = P47
      open_cursors             = 800
      optimizer_mode           = choose
      btree_bitmap_plans     = FALSE
      pushjoin_predicate     = FALSE
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      newinitial_join_orders = FALSE
      optimpeek_user_binds   = FALSE
    PMON started with pid=2
    DBW0 started with pid=3
    LGWR started with pid=4
    CKPT started with pid=5
    SMON started with pid=6
    RECO started with pid=7
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    Thu Dec 13 13:03:39 2007
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    ARC1: Thread not mounted
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