Anyone know of any good examples of a simple BTree implementation in Javascript? I have a bunch of "things" arriving randomly, and want to insert each one efficiently. Ultimately, each new one will get inserted into the DOM based on where it ends up in the tree. I can code this from scratch but would rather not reinvent any wheels. t...
I'm trying to implement a BTree. I'm pretty much done with the tree and works great for a smaller input which means I've implemented the tree in memory. Now I would like to play with large input for which I've to write the tree to a file. I don't know where to get started. I'm using Java and I haven't done too much of 'disk write' coding...
hi, i am writing code for btree algorithms. i am getting NullPointerException . why???? please somebody help me...! public void insertNonFull(BPlusNode root,BPlusNode parent,String key) { int i=0; BPlusNode child=new BPlusNode(); BPlusNode node=parent; while(true) { i=node.numKeys-1; if(node.leaf) ...
I am doing a project in which I require btree or b+tree data structure. Does anyone know of an existing implementation of btree or b+tree (with insert, delete, search algorithms)? It should accept string as input and form btree or b+tree of these string. ...
I have been playing with the very cool btree applet at slady.net. I'm having trouble understanding a particular behavior. Take a look at this starting state: This particular state was arrived at by inserting the following sequence: 10, 15, 30, 16, 70, 1, 9, 27, 45, 50, 55. My question is regarding what happens to the [45, ] node whe...
I will be storing terabytes of information, before indexes, and after compression methods. Should I code up a Binary Tree Database by hand using sort files etc, or use something like MongoDB or even something like MySQL? I am worried about (space) cost per record with things like MySQL and other DB's that are around. I also know that ...
Hi, Is there any file system based B+ Tree implementation in c#(open source). I have found some projects, but those are not file(disk) based implementation. I am specifically looking for file system based B+ Trees. Cheers ...
The manpage for the POSIX binary tree functions includes the following statements: tdelete() returns a pointer to the parent of the item deleted, or NULL if the item was not found. tdelete() frees the memory required for the node in the tree. The user is responsible for freeing the memory for the corresponding data. ...
I have a 10M-row table product with fields like color (int), price (float), weight (float), unitprice (int), etc ... Now users from Web dynamically generate queries to lookup data from this table with random conditions (color is a must have here) and order-by such as select * from product where color=1 and price >5 and price <220 and .....
Hi! I'm looking for efficient algorithm for storing and fetching data by key. I've already read about Litvin linear dynamic hash and another methods, but still, i wonder is there some way to get (search, calculate) key in VERY large binary file (consider more than 100 gb)? I'm just curios is there ANY algorithm which works without perf...
Hi, I'm trying to write a generic C++ implementation of B+Tree. My problem comes from the fact that there are two kinds of nodes in a B+Tree; the internal nodes, which contain keys and pointers to child nodes, and leaf nodes, which contain keys and values, and pointers in an internal node can either point to other internal nodes, or le...
I have an array of integers, which could run into the hundreds of thousands (or more), sorted numerically ascending since that's how they were originally stacked. I need to be able to query the array to get the index of its first occurrence of a number >= some input, as efficiently as possible. The only way I would know how to do this ...