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At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
Content crawled via the Wayback Machine Live Proxy mostly by the Save Page Now feature on web.archive.org.
Liveweb proxy is a component of Internet Archive’s wayback machine project. The liveweb proxy captures the content of a web page in real time, archives it into a ARC or WARC file and returns the ARC/WARC record back to the wayback machine to process. The recorded ARC/WARC file becomes part of the wayback machine in due course of time.
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20160326234426/http://www.seanster.com/BplusTree/BplusTree.html
B+ Trees
A Java applet that animates insertion into B+ trees.
This is a self-directed group project for CISC 235 - Information Structures (Winter 1997) taught by
David Alex Lamb
at Queen's University.
Informally, a B+ tree is an n-ary tree with n variable but large (often >100).
A B+ tree of order v consists of a root, internal nodes and leaves. The root my be either leaf or node with
two or more children. Internal nodes contain between v and 2v keys, and a node with k keys has k + 1 children.
Leaves are always on the same level. If a leaf is a primary index, it consists of a bucket of records, sorted by search key. If it
is a secondary index, it will have many short records consisting of a key and a pointer to the actual record.
Insertion Into a B+ Tree:
do a search to determine what bucket the new record should go in
if the bucket is not full, add the record.
otherwise, split the bucket.
allocate new leaf and move half the bucket's elements to the new bucket
insert the new leaf's smallest key and address into the parent.
if the parent is full, split it also
now add the middle key to the parent node
repeat until a parent is found that need not split
if the root splits, create a new root which has one key and two pointers.
Build Your Own Tree:
Insert elements as before. Build yourself the tree you've always dreamed of!
The width, height, vspace and hspace may be adjusted to suit your web page. The elements parameter specifies the
set of records that the tree will start out with; you may include as many as you want or leave this parameter out entirely.
The defaults parameter specifies the values initially appearing in the text entry boxes. It may also be left out.
