It depends what you want to do with the data. And how many entries your AoH has.

• Are you just processing it sequentially?
• Are you querying/filtering it?
• Do you need to keep it all in memory?

Do you have ...

• Time constraints?
• Memory constraints?
• Disk constraints?

For instance in the easiest case, a trivial solution is to keep it in a text table (CSV) with with 3 columns.

Like that you can read it line by line and have your data in a very efficient way.