On Mar 13, 2012, at 1:26 PM, Davies, Owain wrote: > Hi, > > I have been reading the couchDB guide, particularly the appendix on the > power of b-trees. As I understand it couchdb uses a b+tree, in which the > leaf nodes have pointers to their siblings to facilitate quick in-order > and reverse in-order enumeration of the documents in the b+tree. > > When a document is modified (or added), then the document is appended to > the file, the leaf node is cloned and updated to point to the new > document. However in order to maintain the linked list between the > sibling leaf nodes, you would need to update the adjacent link nodes > (creating new leaf nodes appended onto the end of the file), this will > eventually require that the whole tree is replicated, not just the node > on the path to the effected leaf node. > > I do not think this can be the case, could somebody point out where I > have made the mistake?
yes, the leaf nodes in couchdb are not linked > > Thanks, > > Owain > > Please consider the environment before printing this email. > > This message should be regarded as confidential. If you have received this > email in error please notify the sender and destroy it immediately. > > Statements of intent shall only become binding when confirmed in hard copy by > an authorised signatory. > > The contents of this email may relate to dealings with other companies under > the control of BAE Systems plc details of which can be found at > http://www.baesystems.com/Businesses/index.htm. > > Detica Limited is a BAE Systems company trading as BAE Systems Detica. > Detica Limited is registered in England and Wales under No: 1337451. > Registered office: Surrey Research Park, Guildford, Surrey, GU2 7YP, England. >
