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Exam Code: Certified Data Engineer Professional

Exam Name Certified Data Engineer Professional

Certification Provider: Databricks

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Databricks Certified Data Engineer Professional Practice Test 6

Question 50

An analytics team builds bronze-to-gold data products with Lakeflow Spark Declarative Pipelines. Engineers have applied Read the incremental source into a streaming table instead of overwriting a static table. Which result establishes the required behavior: A target needs append-only ingestion rather than destructive daily replacement?

  1. The pipeline discovers new files and commits them without a daily full scan
  2. New rows appear while previous committed rows remain present
  3. The pipeline dependency graph includes the upstream table and refreshes in order
  4. A second update adds new source rows without replacing prior accepted rows

Explanation

Correct Answer

D:

A second update adds new source rows without replacing prior accepted rows is the matching outcome for the implemented control (Read the incremental source into a streaming table instead of overwriting a static table) and the stated requirement “A target needs append-only ingestion rather than destructive daily replacement.”

Incorrect Answers

A:

That observation is a valid indicator for “A pipeline must ingest a stream from supported cloud files with Auto Loader” when using Use the Auto Loader `cloudFiles` streaming source in a pipeline dataset. The scenario instead tests “A target needs append-only ingestion rather than destructive daily replacement”; the relevant result is A second update adds new source rows without replacing prior accepted rows.

B:

This signal belongs to the adjacent case “A streaming table should preserve append-only raw events rather than reaggregate the entire source,” whose remedy is Define a streaming table over an append-only supported source. The observed result for the present requirement is A second update adds new source rows without replacing prior accepted rows.

C:

That observation is a valid indicator for “An intermediate dataset should automatically refresh when upstream dependencies change” when using Declare its streaming table or materialized view with a dependency on the source dataset. The scenario instead tests “A target needs append-only ingestion rather than destructive daily replacement”; the relevant result is A second update adds new source rows without replacing prior accepted rows.

Question 51

A production Lakeflow pipeline receives ordered insert, update and delete events from operational services. During rollout, stakeholders require: The target must maintain only the latest state of each customer without history. Which approach is the strongest fit?

  1. Use the event sequence column in AUTO CDC `SEQUENCE BY`
  2. Use the full composite natural key in the AUTO CDC `KEYS` clause
  3. Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition
  4. Configure AUTO CDC into an SCD Type 1 target keyed by customer ID with a sequence column

Explanation

Correct Answer

D:

For this scenario, Configure AUTO CDC into an SCD Type 1 target keyed by customer ID with a sequence column implements the behavior required by “The target must maintain only the latest state of each customer without history.” Check the resulting state against: An update replaces the current customer values for a newer sequence number.

Incorrect Answers

A:

Use the event sequence column in AUTO CDC `SEQUENCE BY` is appropriate when “Events may arrive out of order and must not overwrite a newer record with stale values”; it would be verified by A late lower-sequence update leaves the newer target state intact. It does not directly satisfy “The target must maintain only the latest state of each customer without history,” whose relevant acceptance evidence is An update replaces the current customer values for a newer sequence number.

B:

Use the full composite natural key in the AUTO CDC `KEYS` clause belongs to the separate case “A source has duplicate business keys and the target must distinguish two branches,” where Updates affect only rows matching the complete business key would be expected. That differs from the condition in this stem: “The target must maintain only the latest state of each customer without history.”

C:

The alternative Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition has a distinct purpose—Delete events must remove the current SCD1 record according to a source operation field. It would not establish the required outcome (The target must maintain only the latest state of each customer without history); the necessary verification concerns An update replaces the current customer values for a newer sequence number.

Question 52

A production Lakeflow pipeline receives ordered insert, update and delete events from operational services. The team implements Configure AUTO CDC into an SCD Type 1 target keyed by customer ID with a sequence column. The goal was: The target must maintain only the latest state of each customer without history. Which observed result best verifies success?

  1. A late lower-sequence update leaves the newer target state intact
  2. An update replaces the current customer values for a newer sequence number
  3. The target retains separate historical and current versions of a changed key
  4. Updates affect only rows matching the complete business key

Explanation

Correct Answer

B:

An update replaces the current customer values for a newer sequence number is the matching outcome for the implemented control (Configure AUTO CDC into an SCD Type 1 target keyed by customer ID with a sequence column) and the stated requirement “The target must maintain only the latest state of each customer without history.”

Incorrect Answers

A:

A late lower-sequence update leaves the newer target state intact would demonstrate the separate action Use the event sequence column in AUTO CDC `SEQUENCE BY`, which addresses “Events may arrive out of order and must not overwrite a newer record with stale values.” It does not verify the requirement “The target must maintain only the latest state of each customer without history” following Configure AUTO CDC into an SCD Type 1 target keyed by customer ID with a sequence column.

C:

The target retains separate historical and current versions of a changed key would demonstrate the separate action Configure AUTO CDC to store SCD Type 2 history, which addresses “Auditors require the prior attribute values and validity intervals when a dimension changes.” It does not verify the requirement “The target must maintain only the latest state of each customer without history” following Configure AUTO CDC into an SCD Type 1 target keyed by customer ID with a sequence column.

D:

Updates affect only rows matching the complete business key would demonstrate the separate action Use the full composite natural key in the AUTO CDC `KEYS` clause, which addresses “A source has duplicate business keys and the target must distinguish two branches.” It does not verify the requirement “The target must maintain only the latest state of each customer without history” following Configure AUTO CDC into an SCD Type 1 target keyed by customer ID with a sequence column.

Question 53

A production Lakeflow pipeline receives ordered insert, update and delete events from operational services. A design review specifies the following target: Auditors require the prior attribute values and validity intervals when a dimension changes. Which action is most appropriate?

  1. Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition
  2. Configure AUTO CDC to store SCD Type 2 history
  3. Use the full composite natural key in the AUTO CDC `KEYS` clause
  4. Use the event sequence column in AUTO CDC `SEQUENCE BY`

Explanation

Correct Answer

B:

The requirement concerns “Auditors require the prior attribute values and validity intervals when a dimension changes.” The selected operation, Configure AUTO CDC to store SCD Type 2 history, is the direct engineering control. Its effect can be checked by confirming: The target retains separate historical and current versions of a changed key.

Incorrect Answers

A:

Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition is appropriate when “Delete events must remove the current SCD1 record according to a source operation field”; it would be verified by A delete operation produces the expected removal for its key. It does not directly satisfy “Auditors require the prior attribute values and validity intervals when a dimension changes,” whose relevant acceptance evidence is The target retains separate historical and current versions of a changed key.

C:

Use the full composite natural key in the AUTO CDC `KEYS` clause belongs to the separate case “A source has duplicate business keys and the target must distinguish two branches,” where Updates affect only rows matching the complete business key would be expected. That differs from the condition in this stem: “Auditors require the prior attribute values and validity intervals when a dimension changes.”

D:

The alternative Use the event sequence column in AUTO CDC `SEQUENCE BY` has a distinct purpose—Events may arrive out of order and must not overwrite a newer record with stale values. It would not establish the required outcome (Auditors require the prior attribute values and validity intervals when a dimension changes); the necessary verification concerns The target retains separate historical and current versions of a changed key.

Question 54

A production Lakeflow pipeline receives ordered insert, update and delete events from operational services. A production deployment uses Configure AUTO CDC to store SCD Type 2 history to address: Auditors require the prior attribute values and validity intervals when a dimension changes. Which signal should QA check?

  1. The target retains separate historical and current versions of a changed key
  2. A late lower-sequence update leaves the newer target state intact
  3. A delete operation produces the expected removal for its key
  4. Updates affect only rows matching the complete business key

Explanation

Correct Answer

A:

The target retains separate historical and current versions of a changed key is the matching outcome for the implemented control (Configure AUTO CDC to store SCD Type 2 history) and the stated requirement “Auditors require the prior attribute values and validity intervals when a dimension changes.”

Incorrect Answers

B:

A late lower-sequence update leaves the newer target state intact would demonstrate the separate action Use the event sequence column in AUTO CDC `SEQUENCE BY`, which addresses “Events may arrive out of order and must not overwrite a newer record with stale values.” It does not verify the requirement “Auditors require the prior attribute values and validity intervals when a dimension changes” following Configure AUTO CDC to store SCD Type 2 history.

C:

That observation is a valid indicator for “Delete events must remove the current SCD1 record according to a source operation field” when using Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition. The scenario instead tests “Auditors require the prior attribute values and validity intervals when a dimension changes”; the relevant result is The target retains separate historical and current versions of a changed key.

D:

This signal belongs to the adjacent case “A source has duplicate business keys and the target must distinguish two branches,” whose remedy is Use the full composite natural key in the AUTO CDC `KEYS` clause. The observed result for the present requirement is The target retains separate historical and current versions of a changed key.

Question 55

A production Lakeflow pipeline receives ordered insert, update and delete events from operational services. A design review specifies the following target: Events may arrive out of order and must not overwrite a newer record with stale values. Which action is most appropriate?

  1. Configure AUTO CDC to store SCD Type 2 history
  2. Use the event sequence column in AUTO CDC `SEQUENCE BY`
  3. Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition
  4. Configure AUTO CDC into an SCD Type 1 target keyed by customer ID with a sequence column

Explanation

Correct Answer

B:

For this scenario, Use the event sequence column in AUTO CDC `SEQUENCE BY` implements the behavior required by “Events may arrive out of order and must not overwrite a newer record with stale values.” Check the resulting state against: A late lower-sequence update leaves the newer target state intact.

Incorrect Answers

A:

This action solves a different issue: “Auditors require the prior attribute values and validity intervals when a dimension changes.” Its normal signal is The target retains separate historical and current versions of a changed key. Here the requested behavior is “Events may arrive out of order and must not overwrite a newer record with stale values,” so that signal is not sufficient.

C:

Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition belongs to the separate case “Delete events must remove the current SCD1 record according to a source operation field,” where A delete operation produces the expected removal for its key would be expected. That differs from the condition in this stem: “Events may arrive out of order and must not overwrite a newer record with stale values.”

D:

This action solves a different issue: “The target must maintain only the latest state of each customer without history.” Its normal signal is An update replaces the current customer values for a newer sequence number. Here the requested behavior is “Events may arrive out of order and must not overwrite a newer record with stale values,” so that signal is not sufficient.

Question 56

A production Lakeflow pipeline receives ordered insert, update and delete events from operational services. Following Use the event sequence column in AUTO CDC `SEQUENCE BY`, the incident team needs evidence that Events may arrive out of order and must not overwrite a newer record with stale values. Which observation supports closure?

  1. Updates affect only rows matching the complete business key
  2. An update replaces the current customer values for a newer sequence number
  3. A late lower-sequence update leaves the newer target state intact
  4. The target retains separate historical and current versions of a changed key

Explanation

Correct Answer

C:

The team used Use the event sequence column in AUTO CDC `SEQUENCE BY` to fulfill “Events may arrive out of order and must not overwrite a newer record with stale values.” Observing A late lower-sequence update leaves the newer target state intact confirms the intended effect in the resulting workload.

Incorrect Answers

A:

This signal belongs to the adjacent case “A source has duplicate business keys and the target must distinguish two branches,” whose remedy is Use the full composite natural key in the AUTO CDC `KEYS` clause. The observed result for the present requirement is A late lower-sequence update leaves the newer target state intact.

B:

An update replaces the current customer values for a newer sequence number pertains to a different control (Configure AUTO CDC into an SCD Type 1 target keyed by customer ID with a sequence column) and a different need (The target must maintain only the latest state of each customer without history). It cannot establish that Use the event sequence column in AUTO CDC `SEQUENCE BY` met the stated goal.

D:

That observation is a valid indicator for “Auditors require the prior attribute values and validity intervals when a dimension changes” when using Configure AUTO CDC to store SCD Type 2 history. The scenario instead tests “Events may arrive out of order and must not overwrite a newer record with stale values”; the relevant result is A late lower-sequence update leaves the newer target state intact.

Question 57

A production Lakeflow pipeline receives ordered insert, update and delete events from operational services. A scheduled release needs to solve this problem: Delete events must remove the current SCD1 record according to a source operation field. What should the team implement?

  1. Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition
  2. Use the full composite natural key in the AUTO CDC `KEYS` clause
  3. Configure AUTO CDC into an SCD Type 1 target keyed by customer ID with a sequence column
  4. Use the event sequence column in AUTO CDC `SEQUENCE BY`

Explanation

Correct Answer

A:

The requested outcome is “Delete events must remove the current SCD1 record according to a source operation field.” Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition is the matching action; A delete operation produces the expected removal for its key gives observable acceptance evidence.

Incorrect Answers

B:

Use the full composite natural key in the AUTO CDC `KEYS` clause is appropriate when “A source has duplicate business keys and the target must distinguish two branches”; it would be verified by Updates affect only rows matching the complete business key. It does not directly satisfy “Delete events must remove the current SCD1 record according to a source operation field,” whose relevant acceptance evidence is A delete operation produces the expected removal for its key.

C:

This action solves a different issue: “The target must maintain only the latest state of each customer without history.” Its normal signal is An update replaces the current customer values for a newer sequence number. Here the requested behavior is “Delete events must remove the current SCD1 record according to a source operation field,” so that signal is not sufficient.

D:

Use the event sequence column in AUTO CDC `SEQUENCE BY` belongs to the separate case “Events may arrive out of order and must not overwrite a newer record with stale values,” where A late lower-sequence update leaves the newer target state intact would be expected. That differs from the condition in this stem: “Delete events must remove the current SCD1 record according to a source operation field.”

Question 58

A production Lakeflow pipeline receives ordered insert, update and delete events from operational services. After configuring Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition, the engineer must validate: Delete events must remove the current SCD1 record according to a source operation field. What evidence is decisive?

  1. A delete operation produces the expected removal for its key
  2. A late lower-sequence update leaves the newer target state intact
  3. The target retains separate historical and current versions of a changed key
  4. Updates affect only rows matching the complete business key

Explanation

Correct Answer

A:

The acceptance criterion for “Delete events must remove the current SCD1 record according to a source operation field” is A delete operation produces the expected removal for its key; this is the expected evidence after Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition.

Incorrect Answers

B:

This signal belongs to the adjacent case “Events may arrive out of order and must not overwrite a newer record with stale values,” whose remedy is Use the event sequence column in AUTO CDC `SEQUENCE BY`. The observed result for the present requirement is A delete operation produces the expected removal for its key.

C:

That observation is a valid indicator for “Auditors require the prior attribute values and validity intervals when a dimension changes” when using Configure AUTO CDC to store SCD Type 2 history. The scenario instead tests “Delete events must remove the current SCD1 record according to a source operation field”; the relevant result is A delete operation produces the expected removal for its key.

D:

This signal belongs to the adjacent case “A source has duplicate business keys and the target must distinguish two branches,” whose remedy is Use the full composite natural key in the AUTO CDC `KEYS` clause. The observed result for the present requirement is A delete operation produces the expected removal for its key.

Question 59

A production Lakeflow pipeline receives ordered insert, update and delete events from operational services. The change request states: A source has duplicate business keys and the target must distinguish two branches. Which implementation best satisfies that requirement?

  1. Use the full composite natural key in the AUTO CDC `KEYS` clause
  2. Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition
  3. Configure AUTO CDC to store SCD Type 2 history
  4. Configure AUTO CDC into an SCD Type 1 target keyed by customer ID with a sequence column

Explanation

Correct Answer

A:

The requested outcome is “A source has duplicate business keys and the target must distinguish two branches.” Use the full composite natural key in the AUTO CDC `KEYS` clause is the matching action; Updates affect only rows matching the complete business key gives observable acceptance evidence.

Incorrect Answers

B:

Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition belongs to the separate case “Delete events must remove the current SCD1 record according to a source operation field,” where A delete operation produces the expected removal for its key would be expected. That differs from the condition in this stem: “A source has duplicate business keys and the target must distinguish two branches.”

C:

The alternative Configure AUTO CDC to store SCD Type 2 history has a distinct purpose—Auditors require the prior attribute values and validity intervals when a dimension changes. It would not establish the required outcome (A source has duplicate business keys and the target must distinguish two branches); the necessary verification concerns Updates affect only rows matching the complete business key.

D:

This action solves a different issue: “The target must maintain only the latest state of each customer without history.” Its normal signal is An update replaces the current customer values for a newer sequence number. Here the requested behavior is “A source has duplicate business keys and the target must distinguish two branches,” so that signal is not sufficient.

Question 60

A production Lakeflow pipeline receives ordered insert, update and delete events from operational services. The change record shows Use the full composite natural key in the AUTO CDC `KEYS` clause. The acceptance test concerns: A source has duplicate business keys and the target must distinguish two branches. Which outcome confirms it?

  1. A delete operation produces the expected removal for its key
  2. Updates affect only rows matching the complete business key
  3. The target retains separate historical and current versions of a changed key
  4. A late lower-sequence update leaves the newer target state intact

Explanation

Correct Answer

B:

The team used Use the full composite natural key in the AUTO CDC `KEYS` clause to fulfill “A source has duplicate business keys and the target must distinguish two branches.” Observing Updates affect only rows matching the complete business key confirms the intended effect in the resulting workload.

Incorrect Answers

A:

A delete operation produces the expected removal for its key pertains to a different control (Configure AUTO CDC delete handling with the correct `APPLY AS DELETE WHEN` condition) and a different need (Delete events must remove the current SCD1 record according to a source operation field). It cannot establish that Use the full composite natural key in the AUTO CDC `KEYS` clause met the stated goal.

C:

This signal belongs to the adjacent case “Auditors require the prior attribute values and validity intervals when a dimension changes,” whose remedy is Configure AUTO CDC to store SCD Type 2 history. The observed result for the present requirement is Updates affect only rows matching the complete business key.

D:

A late lower-sequence update leaves the newer target state intact pertains to a different control (Use the event sequence column in AUTO CDC `SEQUENCE BY`) and a different need (Events may arrive out of order and must not overwrite a newer record with stale values). It cannot establish that Use the full composite natural key in the AUTO CDC `KEYS` clause met the stated goal.