Design of a HDF file


I am new to HDF, so please be kind.

If I have a CAR object which looks like this :

color : String
type : int
model : String
aboutMe : String -- "more than 1000 characters long"

I have 100 million of these objects.

What is the best way to store this as an HDF object?

1. Does each car object have to go as a compound dataset?

2. Is it good to have each car object as an array and store 100 million of
them? Or, for performance, is it required to limit the number of arrays
stored in a single group?

3. Is it OK to create a million groups - maybe for each type or color ?


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