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Design and develop data processing →mediumMultiple ChoiceObjective-mapped

DP-203 Design and develop data processing Practice Question

This DP-203 practice question tests your understanding of design and develop data processing. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

Exhibit

Azure Data Factory pipeline JSON snippet:

{
    "name": "CopyDataPipeline",
    "activities": [
        {
            "name": "CopyFromBlobToSQL",
            "type": "Copy",
            "inputs": [{"referenceName": "BlobDS", "type": "DatasetReference"}],
            "outputs": [{"referenceName": "SQLDS", "type": "DatasetReference"}],
            "typeProperties": {
                "source": {
                    "type": "BlobSource",
                    "recursive": true
                },
                "sink": {
                    "type": "SqlSink",
                    "writeBatchSize": 10000,
                    "preCopyScript": "TRUNCATE TABLE dbo.target"
                },
                "enableStaging": false,
                "translator": {
                    "type": "TabularTranslator",
                    "columnMappings": {
                        "Id": "Id",
                        "Name": "FullName"
                    }
                }
            }
        }
    ]
}

Refer to the exhibit. A data engineer notices that the target SQL table contains duplicate rows after a pipeline run. Which change to the pipeline configuration would prevent duplicates?

Question 1mediummultiple choice
Full question →

Exhibit

Azure Data Factory pipeline JSON snippet:

{
    "name": "CopyDataPipeline",
    "activities": [
        {
            "name": "CopyFromBlobToSQL",
            "type": "Copy",
            "inputs": [{"referenceName": "BlobDS", "type": "DatasetReference"}],
            "outputs": [{"referenceName": "SQLDS", "type": "DatasetReference"}],
            "typeProperties": {
                "source": {
                    "type": "BlobSource",
                    "recursive": true
                },
                "sink": {
                    "type": "SqlSink",
                    "writeBatchSize": 10000,
                    "preCopyScript": "TRUNCATE TABLE dbo.target"
                },
                "enableStaging": false,
                "translator": {
                    "type": "TabularTranslator",
                    "columnMappings": {
                        "Id": "Id",
                        "Name": "FullName"
                    }
                }
            }
        }
    ]
}

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Add a 'Upsert' setting in SqlSink with a key column

The preCopyScript truncates the table before copy, but if the pipeline is run multiple times and truncation fails or is skipped, duplicates can occur. Using upsert semantics or adding a watermark could help, but the simplest fix is to ensure truncation is reliable. However, the best practice is to use a merge/upsert pattern. Among the options, adding a surrogate key and using upsert is most effective.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    Remove the 'preCopyScript'

    Why it's wrong here

    Removing truncation would actually increase the chance of duplicates on subsequent runs.

  • ✗

    Change 'writeBatchSize' to 5000

    Why it's wrong here

    Batch size affects performance but not duplicate prevention.

  • ✓

    Add a 'Upsert' setting in SqlSink with a key column

    Why this is correct

    Upsert ensures that rows are updated or inserted based on a key, preventing duplicates.

    Related concept

    Static NAT maps one inside address to one outside address.

  • ✗

    Set 'recursive' to false

    Why it's wrong here

    Recursive setting controls whether to read files from subfolders; it does not affect duplicates.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

  • Static NAT maps one inside address to one outside address.
  • PAT allows many inside hosts to share one public address using ports.
  • Inside local and inside global describe the private and translated addresses.
  • NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

  • Identify inside and outside interfaces first.
  • Check whether the scenario needs static NAT, dynamic NAT or PAT.
  • Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-203 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this DP-203 question test?

Design and develop data processing — This question tests Design and develop data processing — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Add a 'Upsert' setting in SqlSink with a key column — The preCopyScript truncates the table before copy, but if the pipeline is run multiple times and truncation fails or is skipped, duplicates can occur. Using upsert semantics or adding a watermark could help, but the simplest fix is to ensure truncation is reliable. However, the best practice is to use a merge/upsert pattern. Among the options, adding a surrogate key and using upsert is most effective.

What should I do if I get this DP-203 question wrong?

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-203 NAT questions on configuration and troubleshooting.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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Last reviewed: Jun 25, 2026

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