There is a problem with a direct mapping between database fields and hash keys if you have a multi-level hash such as a HoH.

Every record is one line of many field = value objects and these can be fairly easily mapped to and from a hash.

However, when your hash has multiple levels you need to somehow collapse your structure into one line.

With a hash of hashes as you have, this is still not too difficult: the first level ("Vlan212", "Vlan215", ...) will become the value of the key field of your record and the structure and contents of your records will be:

Key     inputQueueDrop  inputQueueFlushes  status1 lateErrors  runts
Vlan212 468723          54735              up
Vlan215 80366           80366                      3452        234
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Do have a look at modules such as DBIx::Class, the so-called "Object Relational Mappers", which make using databases much easier.