Thanks for your answer. But, there is not any issue with language. Will it identify the unique record from the name automatically?

As I know, odoo identifies the unique record using external ID.

Yup name is unique. But currently, it happens that when I am uploading the file with same name, it generates a new record. Now, I want that if the name is same, the record must be updated.

Which model are you trying to load data into ?

Its my custom model. Which has only two columns, name and other one.

Is the name field called "name" ?

Have you set it's attributes as Required, Stored and Indexed ?

Yes the field name is "name". But, I have not set Required, Stored and Indexed. Should I need to set it?

Yes. Set it to Required, Stored and Indexed.