JPA When Primary Key Not Id

I'm new using spring and jpa, i notice when my primary key is not

id

id

is gonna effect performance and take more time for process when i try save/insert data, is it just my conclusion but is it true when primay key is not

id

id

(

reference_number

reference_number

varchar) gonna doing

select all data

select all data

for checking if primary key already exist or not?
I hope i could still using

reference_number

reference_number

as primary key and prevent jpa to

select all data

select all data

and just try

insert data

insert data

and throw error when primary key exist

JPA When Primary Key Not Id

JPA When Primary Key Not Id

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