What is the @ mean here?

select count(*) from proddta.fz15002@oneworld, proddta.fz15001@oneworld, proddta.f0101_aec_nonhr_view@oneworld where fz15001.jhz15doisy = 'R1'...............................
I know proddta is schema name, and fz15002 and fz15001 are table names.
I am wondering what is the @ mean here? and what is the oneworld supposed to be here?
Thanks

user8117130 wrote:
I know proddta is schema name, and fz15002 and fz15001 are table names.
I am wondering what is the @ mean here? and what is the oneworld supposed to be here?
select * from user_db_links where db_link = 'ONEWORLD'

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