best way to store HUGE hierarchy data into mysql database?

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I need some help and have been reading online but couldn't find a solid answer to my issue. I don't know how to store my hierarchical data in my innoDB-table.

The potential hierarchy could be 200+ million nodes with 15-20 depths. Once the hierarchy database is created, there is no plan to write to it but only reading.

What can I use? Are there methods to parallel this as well?

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