ORA-600[4194]内部错误一般由重做记录与回滚记录不匹配引发。Oracle在验证Undo record number时，会对比redo chang和回滚段中的undo record number，若发现2者存在差异则报该4194错误。其错误argument[a][b]，a代表回滚块中的最大undo record number，b代表重做日志中记录的undo record number。这个错误可能由回滚段或者redo log日志文件讹误引起。
此错误不像ORA-600[2662]或ORA-600[4000]错误那样必然导致数据库无法打开，因为它很少出现在前滚阶段；当数据库被打开，smon开始执行事务恢复或一些回滚段的管理工作时则很有可能触发该错误。
来具体看一下错误记录:
Thu Aug 26 18:58:50 2010
Errors in file /s01/10gdb/admin/YOUYUS/bdump/youyus_smon_6587.trc:
ORA-01595: error freeing extent (3) of rollback segment (4))
ORA-00600: internal error code, arguments: [4194], [53], [41], [], [], [], [], []
Thu Aug 26 18:58:50 2010
..............
Errors in file /s01/10gdb/admin/YOUYUS/bdump/youyus_j000_6630.trc:
ORA-00354: corrupt redo log block header
ORA-00353: log corruption near block 2 change 1617922 time 08/26/2010 18:35:39
ORA-00334: archived log: '/s01/10gdb/flash_recovery_area/YOUYUS/onlinelog/o1_mf_3_65psr4on_.log'
Thu Aug 26 19:00:31 2010
Errors in file /s01/10gdb/admin/YOUYUS/bdump/youyus_j000_6630.trc:
ORA-00600: internal error code, arguments: [4194], [53], [41], [], [], [], [], []
Thu Aug 26 19:00:34 2010
Errors in file /s01/10gdb/admin/YOUYUS/bdump/youyus_j000_6630.trc:
ORA-00354: corrupt redo log block header
ORA-00353: log corruption near block 2 change 1617922 time 08/26/2010 18:35:39
ORA-00334: archived log: '/s01/10gdb/flash_recovery_area/YOUYUS/onlinelog/o1_mf_3_65psr4on_.log'
ORA-00600: internal error code, arguments: [4194], [53], [41], [], [], [], [], []
Thu Aug 26 19:00:35 2010
Errors in file /s01/10gdb/admin/YOUYUS/bdump/youyus_j000_6630.trc:
ORA-00354: corrupt redo log block header
ORA-00353: log corruption near block 2 change 1617922 time 08/26/2010 18:35:39
ORA-00334: archived log: '/s01/10gdb/flash_recovery_area/YOUYUS/onlinelog/o1_mf_3_65psr4on_.log'
ORA-00600: internal error code, arguments: [4194], [53], [41], [], [], [], [], []
如果你因为ORA-600[4194]错误导致数据库无法打开，那么可以尝试设置以下事件:
SQL> alter system set event='10513 trace name context forever,level 2 : 10512 trace name context forever,level 1: 10511 trace name context forever,level 2: 10510 trace name context forever,level 1' scope=spfile;
System altered.
/* 10513事件用以阻止SMON在启动数据库后执行事务恢复(transaction recovery) */
/* 10512事件用以阻止SMON shrink rollback segment */
/* 10511事件用以阻止SMON check to cleanup undo dictionary */
/* 10500事件用以阻止SMON check to offline pending offline rollback segment */
SQL> alter system set undo_management=MANUAL scope=spfile;
System altered.
SQL> shutdown immediate;
ORA-03113: end-of-file on communication channel
SQL> startup mount;
ORACLE instance started.
Total System Global Area 2634022912 bytes
Fixed Size 2086288 bytes
Variable Size 2382367344 bytes
Database Buffers 234881024 bytes
Redo Buffers 14688256 bytes
Database mounted.
SQL> alter database open;
Database altered.
SQL> create undo tablespace undoc datafile size 300M;
SQL> alter system set undo_management=AUTO scope=spfile;
System altered.
SQL> alter system set undo_tablespace=undoc scope=spfile;
System altered.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 2634022912 bytes
Fixed Size 2086288 bytes
Variable Size 2382367344 bytes
Database Buffers 234881024 bytes
Redo Buffers 14688256 bytes
Database mounted.
SQL> alter database open;
Database altered.
/* 通过重建undo表空间可以避免一些4194错误，但不是全部 */
/* 这个库目前处于随时会crash的不可控状态，我们必须要导出数据并导入到新库中 * /
/* 这种情况下direct方式 可能可以规避一些意外错误 */
[maclean@rh2 dump]$ exp maclean/maclean file=full_maclean.dmp owner=maclean direct=y statistics=none
Export: Release 10.2.0.4.0 - Production on Thu Aug 26 21:18:40 2010
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export done in ZHS16GBK character set and UTF8 NCHAR character set
About to export specified users ...
. exporting pre-schema procedural objects and actions
. exporting foreign function library names for user MACLEAN
. exporting PUBLIC type synonyms
. exporting private type synonyms
. exporting object type definitions for user MACLEAN
About to export MACLEAN's objects ...
. exporting database links
. exporting sequence numbers
. exporting cluster definitions
. about to export MACLEAN's tables via Direct Path ...
Table SYS_EXPORT_TABLE_01 will be exported in conventional path.
. . exporting table SYS_EXPORT_TABLE_01 256 rows exported
Table SYS_EXPORT_TABLE_02 will be exported in conventional path.
. . exporting table SYS_EXPORT_TABLE_02 257 rows exported
Table SYS_EXPORT_TABLE_03 will be exported in conventional path.
..............
exporting refresh groups and children
. exporting dimensions
. exporting post-schema procedural objects and actions
. exporting statistics
Export terminated successfully with warnings.
/* we are lucky! */