一个817数据库报ORA-600 4194 无法正常启动

Fri Jul 25 10:49:47 2014
Database mounted in Exclusive Mode.
Completed: ALTER DATABASE   MOUNT
Fri Jul 25 10:49:58 2014
ALTER DATABASE RECOVER  database
Fri Jul 25 10:49:58 2014
Media Recovery Start
Media Recovery Log
Recovery of Online Redo Log: Thread 1 Group 2 Seq 3320 Reading mem 0
  Mem# 0 errs 0: D:\ORACLE\ORADATA\ORCL\REDO02.LOG
Media Recovery Complete
Completed: ALTER DATABASE RECOVER  database
Fri Jul 25 10:50:09 2014
alter database open
Beginning crash recovery of 1 threads
Fri Jul 25 10:50:09 2014
Thread recovery: start rolling forward thread 1
Recovery of Online Redo Log: Thread 1 Group 2 Seq 3320 Reading mem 0
  Mem# 0 errs 0: D:\ORACLE\ORADATA\ORCL\REDO02.LOG
Fri Jul 25 10:50:09 2014
Thread recovery: finish rolling forward thread 1
Thread recovery: 0 data blocks read, 0 data blocks written, 3 redo blocks read
Crash recovery completed successfully
Fri Jul 25 10:50:09 2014
Thread 1 advanced to log sequence 3321
Thread 1 opened at log sequence 3321
  Current log# 3 seq# 3321 mem# 0: D:\ORACLE\ORADATA\ORCL\REDO01.LOG
Successful open of redo thread 1.
Fri Jul 25 10:50:09 2014
SMON: enabling cache recovery
Fri Jul 25 10:50:10 2014
Errors in file D:\oracle\admin\ORCL\udump\ORA03216.TRC:
ORA-00600: ??????????: [4194], [12], [37], [], [], [], [], []
Fri Jul 25 10:50:10 2014
Recovery of Online Redo Log: Thread 1 Group 3 Seq 3321 Reading mem 0
  Mem# 0 errs 0: D:\ORACLE\ORADATA\ORCL\REDO01.LOG
Fri Jul 25 10:50:10 2014
SMON: disabling cache recovery
Fri Jul 25 10:50:10 2014
ORA-600 signalled during: alter database open

ORA-600 4194这个错误在数据库异常恢复中非常常见，因为库不是很重要,因此就是直接屏蔽掉故障回滚段,然后强制拉库,该库的恢复过程中,也直接使用隐含参数屏蔽回滚段
_corrupted_rollback_segments= RBS0, RBS1, RBS2, RBS3, RBS4, RBS5, RBS6, RBS_HDSYS,数据库依然无法open,进一步分析trace文件

Fri Jul 25 11:26:07 2014
ORACLE V8.1.7.0.0 - Production vsnsta=0
vsnsql=e vsnxtr=3
Windows 2000 Version 5.2 Service Pack 2, CPU type 586
Oracle8i Release 8.1.7.0.0 - Production
JServer Release 8.1.7.0.0 - Production
Windows 2000 Version 5.2 Service Pack 2, CPU type 586
Instance name: orcl
Redo thread mounted by this instance: 1
Oracle process number: 14
Windows thread id: 3648, image: ORACLE.EXE
*** SESSION ID:(11.1) 2014-07-25 11:26:07.843
*** 2014-07-25 11:26:07.843
ksedmp: internal or fatal error
ORA-00600: ??????????: [4194], [12], [37], [], [], [], [], []
Current SQL statement for this session:
update undo$ set name=:2,file#=:3,block#=:4,status$=:5,user#=:6,undosqn=:7,xactsqn=:8,
scnbas=:9,scnwrp=:10,inst#=:11,ts#=:12 where us#=:1
----- Call Stack Trace -----

这里很明显看出来，数据库是在open过程中，update undo$表遭遇到ORA-600 4194,因为该过程需要使用系统回滚段，但是由于其所对应的undo和redo信息不一致，所以无法正常启动数据库.继续读trace文件

  Extent Control Header
  -----------------------------------------------------------------
  Extent Header:: spare1: 0      space2: 0      #extents: 5      #blocks: 49
                  last map  0x00000000  #maps: 0      offset: 4128
      Highwater::  0x00400006  ext#: 0      blk#: 3      ext size: 9
  #blocks in seg. hdr's freelists: 0
  #blocks below: 0
  mapblk  0x00000000  offset: 0
                   Unlocked
     Map Header:: next  0x00000000  #extents: 5    obj#: 0      flag: 0x40000000
  Extent Map
  -----------------------------------------------------------------
   0x00400003  length: 9
   0x0040000c  length: 10
   0x0040008f  length: 10
   0x00400099  length: 10
   0x004000a3  length: 10
  TRN CTL:: seq: 0x003c chd: 0x004e ctl: 0x0050 inc: 0x00000000 nfb: 0x0000
            mgc: 0x8002 xts: 0x0068 flg: 0x0001 opt: 2147483646 (0x7ffffffe)
            uba: 0x00400006.003c.25 scn: 0x0000.009a4009
Version: 0x01
  FREE BLOCK POOL::
    uba: 0x00000000.003c.24 ext: 0x0  spc: 0x196
    uba: 0x00000000.001f.14 ext: 0x1  spc: 0x16f6
    uba: 0x00000000.0018.02 ext: 0x4  spc: 0x1f1a
    uba: 0x00000000.0000.00 ext: 0x0  spc: 0x0
    uba: 0x00000000.0000.00 ext: 0x0  spc: 0x0
  TRN TBL::

通过这里可以看出来,数据库在启动的时候，使用system undo的block为为0x00400006,使用bbed清除掉该uba记录,让数据库启动的时候重新分配system undo block给数据库执行update undo$使用,数据库open成功

BBED> m /x 0x00000000
 File: D:\ORACLE\ORADATA\ORCL\SYSTEM01.DBF (0)
 Block: 2                Offsets: 4188 to 4192           Dba:0x00000000
------------------------------------------------------------------------
 00000000 3c002400 00009601 00000000 1f001400 0100f616 00000000 18000200
BBED> m /x 0x0000
 File: D:\ORACLE\ORADATA\ORCL\SYSTEM01.DBF (0)
 Block: 2                Offsets: 4028 to 4032           Dba:0x00000000
------------------------------------------------------------------------
 00000000 00000000 3c005000 02800100 68000000 feffff7f 06004000 3c002400

Sat Jul 26 12:09:21 2014
Thread recovery: start rolling forward thread 1
Recovery of Online Redo Log: Thread 1 Group 2 Seq 3326 Reading mem 0
  Mem# 0 errs 0: D:\ORACLE\ORADATA\ORCL\REDO02.LOG
Sat Jul 26 12:09:21 2014
Thread recovery: finish rolling forward thread 1
Thread recovery: 0 data blocks read, 0 data blocks written, 3 redo blocks read
Crash recovery completed successfully
Sat Jul 26 12:09:22 2014
Thread 1 advanced to log sequence 3327
Thread 1 opened at log sequence 3327
  Current log# 3 seq# 3327 mem# 0: D:\ORACLE\ORADATA\ORCL\REDO01.LOG
Successful open of redo thread 1.
Sat Jul 26 12:09:22 2014
SMON: enabling cache recovery
SMON: enabling tx recovery
Sat Jul 26 12:09:39 2014
Completed: alter database open