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Which two actions will help you improve the performance without changing the business logic?

Refer to the exhibit.

You are responsible for improving performance for a given job. From reviewing the job dump
score, you notice that many tsort operators are inserted. Join_1 is on columns “account”,
“po_date” and “hdr_number”. Join_2 is based on “account”, “hdr_number”, “paid_date”.
Which two actions will help you improve the performance without changing the business logic?
(Select two)