In which of the following file formats is data from Delta Lake tables primarily stored?

The correct answer is C. Parquet. Delta Lake stores its actual data in Parquet format, a columnar binary file format known for efficient compression and fast analytical query performance. Delta Lake adds a transaction log (the _delta_log directory containing JSON and checkpoint files) on top of Parquet to…

Submitted by javi_es· Apr 18, 2026Databricks Lakehouse Platform

Question

In which of the following file formats is data from Delta Lake tables primarily stored?

Options

ADelta
BCSV
CParquet
DJSON
EA proprietary, optimized format specific to Databricks

How the community answered

(46 responses)

A
7% (3)
C
89% (41)
D
2% (1)
E
2% (1)

Explanation

Delta Lake stores its actual data in Parquet format, a columnar binary file format known for efficient compression and fast analytical query performance. Delta Lake adds a transaction log (the _delta_log directory containing JSON and checkpoint files) on top of Parquet to provide ACID transactions, schema enforcement, and time travel. 'Delta' is the table format/protocol layer, not a file storage format. CSV and JSON are row-oriented text formats, and Delta Lake does not use a proprietary binary format.

Topics

#Delta Lake#File Formats#Parquet#Data Storage

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