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The "Why are all Views in a single Index" page has been changed by 
BenjaminYoung:
http://wiki.apache.org/couchdb/Why%20are%20all%20Views%20in%20a%20single%20Index?action=diff&rev1=2&rev2=3

Comment:
added jchris' tweet about back refs

  }}}
  Here view1 and view2 have exactly the same map function. If they were in 
different design documents, there would be two b-trees (in two different index 
files) for exactly the same data. Now, if they are in a single design document, 
we use one b-tree only, but we save disk space and update time by only updating 
one btree instead of two. Of course, this is easy only because we use one 
single index file for a design document with multiple views.
  
+ == Other Reasons: ==
+ ||<tablewidth="100%"> 
{{https://si0.twimg.com/profile_images/1611440478/IMG_0049_normal.jpg|jchris}} 
||'''jchris'''<<BR>>@bigbluehat @fdmanana also a combined index file can keep a 
 single index of back refs from docids to rows, for invalidating old  
rows<<BR>> [[https://twitter.com/jchris/status/169514764693803010|2/14/12 3:14 
PM]] ||
+ 

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