Indices for in-memory databases?

I am just researching about indices for databases. So far I have only found the index structures T-Tree and Adaptive Radix Tree. Are there more index structures ? Thanks a lot

Solution

You can check out our YouTube channel, https://www.youtube.com/user/McObject/videos, which has some vendor-neutral tutorials on different types of indexes. Any index can implemented in memory. We implemented b-tree, r-tree, kd-tree, patricia trie, hash, and trigram indexes in our IMDS.

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