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Question 171 - MCD - Level 1 discussion

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In the Database On Table Row operation, what does the Watermark column enable the On Table Row operation to do?

A.
To avoid duplicate processing of records in a database.
Answers
A.
To avoid duplicate processing of records in a database.
B.
To delete the most recent records retrieved from a database to enable database caching
Answers
B.
To delete the most recent records retrieved from a database to enable database caching
C.
To enable duplicate processing of records in a database
Answers
C.
To enable duplicate processing of records in a database
D.
To save the most recent records retrieved from a database to enable database caching
Answers
D.
To save the most recent records retrieved from a database to enable database caching
Suggested answer: A

Explanation:

The correct answer is To avoid duplicate processing of records in a database.

If a watermark column is provided, the values taken from that column are used to filter the contents of the next poll, so that only rows with a greater watermark value are returned. If an ID column is provided, this component automatically verifies that the same row is not picked twice by concurrent polls.

Mule doc reference : https://docs.mulesoft.com/db-connector/1.8/database-documentation#listener

asked 18/09/2024
Mark Green
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