In this episode of the backend engineering show I'll discuss the difference between b-tree and b+tree why they were invented, what problems do they solve, and the advantages and disadvantages of both. I'll also discuss the limitation of implementing b-tree over b+tree and how Discord ran into a memory limitation using b-tree Mongo.

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0:00 Data structure and algorithms
1:30 Working with large datasets
6:00 Binary Tree
8:30 B-tree
19:30 B+ tree
22:00 B-tree vs B+ tree benefits
25:00 MongoDB Btree Indexes Trouble
30:00 Summary
working with a billion row table (Members only)
https://youtu.be/wj7KEMEkMUE
indexing video
https://youtu.be/-qNSXK7s7_w
Discord moving from MongoDB to Cassandra
https://www.youtube.com/watch?v=86olupkuLlU
https://blog.discord.com/how-discord-stores-billions-of-messages-7fa6ec7ee4c7
MongoDB Indexes
https://docs.mongodb.com/manual/indexes/
Postgres Indexes
https://www.postgresql.org/docs/13/btree-implementation.html
btree code
https://www.cs.usfca.edu/~galles/visualization/BPlusTree.html
https://www.cs.usfca.edu/~galles/visualization/BTree.html


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