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Are keys in B-tree nodes duplicated when the node is split?


Are keys in B-tree nodes duplicated when the node is split?

By : Vijay Baskar Reddy
Date : November 20 2020, 07:00 PM
wish help you to fix your issue No. It's all done with pointers. Half of the pointers are moved to the new node.
Of course, there's no such thing as 'a B-tree'. There are a myriad of different implementations. I could imagine one in which the keys are actually stored in the nodes, such as a tree where the keys are ints. But they still wouldn't be 'duplicated', just the data copied.
code :


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Generic N-ary Tree (Tree with more than two node per child) Tree Traversal in Java using List for nodes

Generic N-ary Tree (Tree with more than two node per child) Tree Traversal in Java using List for nodes


By : gclarkmt
Date : March 29 2020, 07:55 AM
around this issue I have been trying to implement a tree representation of Autosys job schedules at work. As each job(process) can have one or or more dependent job on them, i decided to go with a n-ary tree implementation so that i can map the flow. I an using java collections for the same.
code :
nary_list.iterator()
while(t.nary_list.iterator().hasNext()){
Iterator<NaryTreeNode> iterator = t.nary_list.iterator();
while (iterator.hasNext()) {
for (NaryTreeNode node : t.nary_list) 
// Display all of my children
for (NaryTreeNode node : t.nary_list) {
    display(node);
}

// Display myself
System.out.println("Value is: " + t.data);
Map from 2 different nodes to duplicated target node

Map from 2 different nodes to duplicated target node


By : Ilya Kulikov
Date : March 29 2020, 07:55 AM
may help you . I have this source and target : , Place looping functoid
code :
A --> Looping Functoid --> T
B --> Looping Functoid --> T

FieldA --> F1
FieldB --> F2
FieldC --> F1
FieldD --> F2
javascript Split hierarchical tree into all the sub-trees and group the nodes of each sub-tree by its level

javascript Split hierarchical tree into all the sub-trees and group the nodes of each sub-tree by its level


By : user2639927
Date : March 29 2020, 07:55 AM
To fix this issue This should do the trick, and unless you are handling around 1m nodes or very deep trees, should be pretty fast:
code :
var data={
    //your data
}


var arr=[]; // array that holds an array of names for each sublevel

function traverse(data, level){
    if(arr[level]==undefined) arr[level]=[]; // if its the first time reaching this sub-level, create array
    arr[level].push(data.name); // push the name in the sub-level array
    for(var index=0;index<data.children.length;index++){ // for each node in children
        traverse(data.children[index], level+1); // travel the node, increasing the current sub-level
    }
}

traverse(data, 0); // start recursive function
console.log(arr)
Duplicated keys in Tree Map when accesing concurrently

Duplicated keys in Tree Map when accesing concurrently


By : Tharindu Nanayakkara
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Your compareTo is screwy. You can get the same result single threaded with something like this
code :
    ScoreServiceImpl.getInstance().addScore(0,1,4);
    ScoreServiceImpl.getInstance().addScore(0,1,12);
    ScoreServiceImpl.getInstance().addScore(0,0,10);
    ScoreServiceImpl.getInstance().addScore(0,0,3);
@Override
public int compareTo(UserHighScore uh) {
    return Integer.compare(userId, uh.userId);
}
When you split a node from a B-Tree and it's of an odd order, how do you evenly distribute the keys?

When you split a node from a B-Tree and it's of an odd order, how do you evenly distribute the keys?


By : asahina_mukade
Date : March 29 2020, 07:55 AM
seems to work fine When you split a node that is of order 5, then you would have 4 keys, so you would be able to distribute evenly, but when the node has an odd number of keys then things dont distribute so evenly. Any help with this? , Go read Wikipedia article. It describes this exactly:
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