Unal, What part of the block sturcture? Segment Header, 
Datablock Header? There are things in the blocks that are 
no different than they where in 6,7,8 or 8i. However with 
some of the new features such bitmap freelists, low 
highwater mark, high high waterwater, and changes to 
pctfree. There are some modifications to the block header 
and the segment header. They way rows are stored in the 
block pretty much remain the same. This is pretty much 
what I have learned to this point. 

Scott
> Hi,
> 
> Do you know if Oracle9i block structures are modified ?
> 
> thanks in advance...
> 
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> Author: Danisment Gazi Unal (Unal Bilisim)
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