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Answer: Use a MERGE statement with a unique identifier in the Delta Lake to perform the upsert operation.
Using a MERGE statement with a unique identifier ensures that the upsert operation is both efficient and maintains data consistency. This method leverages the capabilities of Delta Lake to handle large datasets and frequent updates without compromising performance.
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Consider a scenario where you need to upsert batch data into a Delta Lake. The data includes customer profiles that are updated frequently. How would you structure your upsert operation to ensure data consistency and minimize performance impact?
A
Use a MERGE statement with a unique identifier in the Delta Lake to perform the upsert operation.
B
Delete the existing data and insert the new data each time to ensure consistency.
C
Perform the upsert operation using a Python script that checks for duplicates before inserting.
D
Manually compare the new data with the existing data in the Delta Lake and update records one by one.