XPost: comp.databases.rdb, comp.databases.revelation, comp.databases.object   
   From: Radium_Systems@bigpond.com   
      
   I dont beleive this is correct as my experience with R83 pick 15 years ago   
   accesses data using linked chains with a direct reference to Physical   
   storage location on disk.  Anyone who ever had a GFE (Lost chain) will know   
   this. I have on a few occasions had to go through the physical chains and   
   repair them. This is primarly why Pick was always so fast using pre   
   allocated chunks of space on physical disk in a contiguous blocks so related   
   data is referenced in a continues read primarly on the same sector on Hard   
   disk. This is why housekeeping file sizing was so important so as not to   
   have any data fill beyond its allocated file size and flow into overflow   
   space (kind of a pre allocated area for file fragements on disk).   
      
   So I think that this (I might be wrong) proves   
      
      
   "Nobody"  wrote in message   
   news:xzbBb.65050$_M.317461@attbi_s54...   
   > Relational databases use keys.  Object databases use some sort of   
   > pointer to physical storage location.   
   >   
   > That's all.   
   >   
   >   
   > yensao wrote:   
   > > Hi,   
   > > I have a hard time to understand difference and similarities between   
   > > Relational database model and the Object-Oriented model. Can somebody   
   > > help me with this?   
   > >   
   > >   
   > > Thank you in advance.   
   > >   
   > > Yensao   
   >   
      
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