exp ORA-01466: unable to read data

vincen

• 作者: 三十而立
  
• 时间：2009年10月02日 22:43:20
  
• 本文出自 “inthirties（三十而立）”博客，转载请务必注明作者和保留出处http://blog.iyunv.com/inthirties/archive/2009/10/02/4628127.aspx
  

　　
　　

exp ORA-01466: unable to read data - table definition has changed，在做一次exp的时候出现这样的问题  

来至这个问题的解释  

Solution Description:  
=====================  

This is usually caused when some change has been made to the  
initialisation parameter FIXED_DATE or the system date. It can occur  
under different circumstances.  

1. When doing Date testing and the init.ora parameter FIXED_DATE  
has been set to a future date. When the database is started, then  
that date & time does not change.  

So any objects created will have exactly the same Date & Time  
stamp as the FIXED_DATE.  

Now When you come to run the EXPORT, it checks the SYSDATE  
and the creation dates for the objects.  

You need to modify the TIME in the FIXED_DATE parameter,  
i.e. add 1 hour or few minutes, etc and you will not  
encounter the error ORA-1466 anymore.  

2. The Operating System was reinstalled because of the server crash.  
The system date was not set correctly. The year was set to 2001  
instead of 1997 when they reinstalled Oracle. After some DB activity  
they realized the date was incorrect and reset it to 1997 causing some  
objects to exist with future dates.  

Perform full database export without specifying consistent=y and  
recreate the database.

  
  
   　　
  

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