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Relevant: Concurrent on-disk btree

https://code.google.com/p/high-concurrency-btree/

"Lehman and Yao's high concurrency B-Tree in C language with Jaluta's balanced B-link tree operations including a locking enhancement for increased concurrency"

Now this would be very interesting! Been trying to find good resources on this for a while, but found none ...

You might want to look at the blog of H2 database author. He wrote 2 DB from scratch.

Hm, not easy to find. Could you please share the link of that blog?