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What data is actually stored in the B-tree database in CouchDB?

I am wondering what is actually stored in the CouchDB database B-tree? The CouchDB: The Definitive Guide reports that the database B-tree is used for add-only operations and that the database is stored in one B -tree (except for B-trees) for viewing.

So, I think that the data elements that are added to the database file are revisions of documents, not all documents:

            +---------|### ...  
            |           |
   +------|###|------+     ... ---+
   |        |        |            |
+------+ +------+ +------+     +------+
| doc1 | | doc2 | | doc1 | ... | doc1 |
| rev1 | | rev1 | | rev2 |     | rev7 |
+------+ +------+ +------+     +------+

It's true?

If so, how is the current revision of the document based on such a B-tree determined?

, CouchDB "view" O (log n)? ? ( , CouchDB ).

+5
2

append; B- . ,

  • node ( DB)
  • node ( , )
  • 2, node

node, , "". , , node id. .

+3

CouchDB diff. , _rev _id, . .

+1

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