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Databricks Exam Databricks-Certified-Professional-Data-Engineer Topic 1 Question 4 Discussion

Actual exam question for Databricks's Databricks-Certified-Professional-Data-Engineer exam
Question #: 4
Topic #: 1
[All Databricks-Certified-Professional-Data-Engineer Questions]

A junior data engineer is migrating a workload from a relational database system to the Databricks Lakehouse. The source system uses a star schema, leveraging foreign key constrains and multi-table inserts to validate records on write.

Which consideration will impact the decisions made by the engineer while migrating this workload?

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Suggested Answer: A

In Databricks and Delta Lake, transactions are indeed ACID-compliant, but this compliance is limited to single table transactions. Delta Lake does not inherently enforce foreign key constraints, which are a staple in relational database systems for maintaining referential integrity between tables. This means that when migrating workloads from a relational database system to Databricks Lakehouse, engineers need to reconsider how to maintain data integrity and relationships that were previously enforced by foreign key constraints. Unlike traditional relational databases where foreign key constraints help in maintaining the consistency across tables, in Databricks Lakehouse, the data engineer has to manage data consistency and integrity at the application level or through careful design of ETL processes. Reference:

Databricks Documentation on Delta Lake: Delta Lake Guide

Databricks Documentation on ACID Transactions in Delta Lake: ACID Transactions in Delta Lake


by Aliza at Mar 16, 2024, 02:57 AM

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Brigette
5 months ago
I think foreign keys referencing primary key fields and leveraging Delta Lake's upsert functionality will be crucial for the migration.
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Golda
5 months ago
That's a good point, the engineer will need to look into that when making decisions.
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Rima
5 months ago
But doesn't Databricks only allow foreign key constraints on hashed identifiers? That could impact the migration.
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Miss
5 months ago
I agree, it's important to know that all Delta Lake transactions are ACID compliant against a single table.
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Golda
5 months ago
I think the engineer should consider the fact that Databricks does not enforce foreign key constraints.
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Elina
5 months ago
I also think option A is worth considering, as ACID compliance plays a big role in maintaining data consistency.
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Tommy
6 months ago
That makes sense, ensuring data integrity is crucial when migrating to a new system.
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Sharee
6 months ago
I believe option C is the most relevant, as it addresses the need for foreign keys to reference primary keys and the use of Delta Lake's upsert functionality with multi-table inserts.
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Kris
6 months ago
I agree, it's important to understand the impact of this difference on the migration process.
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Tommy
6 months ago
I think the key consideration here is how Delta Lake transactions differ from the source system's handling of foreign key constraints.
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