hey folks, I'm a bit confused about datascript indexes. is it actually store all the datums in the index nodes ?

Yes @lxsameer. Not only that, it stores them all at least 3 times because there are 3+ indexes.

like eavt and aevt and ...

?

Yes

It might be at least 2 times, need to refresh my memory

http://tonsky.me/blog/datascript-internals/ might be interesting to you

absolutely

thanks

also are you familiar with datahike ?

First time i'm hearing of it, but I'm familiar with 'hitchiker trees'

cool, so it does not make sense to me to store the data in the B+ or hitchhiker tree index nodes 3 times

for datascript it makes sense since it is memory base

but does it make sense for a storage base tree ?

No, I bet its the same in datahike. Datomic also stores the atoms in the index nodes, multiple times.

It's a trade off between storage (cheap) and performance

so all of them store the datums on the index nodes as well

Yep

thank you so much man , you clarified lots of my confusions