在数据库恢复中,ORA-600 2662我想是很多人都非常熟悉的错误,下文是对于该错误的一些解释
ORA-600 2662解释说明

ERROR:              

  Format: ORA-600 [2662] [a] [b] 1 [d] [e]
 
VERSIONS:
  versions 6.0 to 12.1
 
DESCRIPTION:

  A data block SCN is ahead of the current SCN.

  The ORA-600 [2662] occurs when an SCN is compared to the dependent SCN 
  stored in a UGA variable.

  If the SCN is less than the dependent SCN then we signal the ORA-600 [2662]
  internal error.

ARGUMENTS:
  Arg [a]  Current SCN WRAP
  Arg [b]  Current SCN BASE
  Arg {c}  dependent SCN WRAP
  Arg [d]  dependent SCN BASE 
  Arg [e]  Where present this is the DBA where the dependent SCN came from.

出现ORA-600 2662可能的原因

  (1) doing an open resetlogs with _ALLOW_RESETLOGS_CORRUPTION enabled    
  (2) a hardware problem, like a faulty controller, resulting in a failed 
      write to the control file or the redo logs     
  (3) restoring parts of the database from backup and not doing the 
      appropriate recovery     
  (4) restoring a control file and not doing a RECOVER DATABASE USING BACKUP 
      CONTROLFILE     
  (5) having _DISABLE_LOGGING set during crash recovery                      
  (6) problems with the DLM in a parallel server environment      
  (7) a bug   

ORA-600 2662解决方法

   (1) if the SCNs in the error are very close, attempting a startup several 
       times will bump up the dscn every time we open the database even if 
       open fails. The database will open when dscn=scn.
      
   (2)You can bump the SCN either on open or while the database is open 
      using Event:ADJUST_SCN 
      Be aware that you should rebuild the database if you use this
      option.