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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