Validation of large arrays with unique & exists (db)

[sbc640964]

Greetings

I have a problem and I'm looking for a suitable solution
I import by uploading an Excel file by the user
The file is parserd to a huge array and I validate it as unique and / or existe (database).

i response to user the validate and user confirm that, And only now I put the lines in db.

These cases result in one query for each validation and for each row
Imagine I have 5000 or more rows, in practice there should be 10000 queries just for verification, which fills in heavy resources and crashes.

What is the way to do it in the most correct way and in the frame language?