What is the default storage format for Fabric's OneLake?

Prepare for the DP-700 Microsoft Fabric Data Engineer Exam with flashcards and multiple choice questions. Study with hints and explanations, and ensure success on your certification exam!

Multiple Choice

What is the default storage format for Fabric's OneLake?

Explanation:
OneLake in Fabric uses Delta-Parquet as its default storage format. Parquet provides efficient, columnar storage ideal for analytics, while Delta Lake adds a transaction log that enables ACID guarantees, time travel (data versioning), and schema enforcement. This combination allows data stored in OneLake to be updated, merged, and queried reliably at scale, across multiple Fabric services, with strong consistency and good performance. Other formats like JSON, CSV, or ORC can be used in different contexts, but they don’t offer the integrated transactional features that Delta-Parquet provides, which is why Delta-Parquet is the default choice for OneLake.

OneLake in Fabric uses Delta-Parquet as its default storage format. Parquet provides efficient, columnar storage ideal for analytics, while Delta Lake adds a transaction log that enables ACID guarantees, time travel (data versioning), and schema enforcement. This combination allows data stored in OneLake to be updated, merged, and queried reliably at scale, across multiple Fabric services, with strong consistency and good performance. Other formats like JSON, CSV, or ORC can be used in different contexts, but they don’t offer the integrated transactional features that Delta-Parquet provides, which is why Delta-Parquet is the default choice for OneLake.

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