Answer-first summary for fast verification
Answer: New files are identified by listing the input directory; new files are incrementally and idempotently loaded into the target Delta Lake table.
The default execution mode for Databricks Auto Loader is **Directory Listing**. In this mode, Auto Loader identifies new files by periodically listing the input directory. This approach does not require additional cloud infrastructure setup (unlike the File Notification mode, which uses cloud-specific services). New files are loaded incrementally and idempotently into the target Delta Lake table. Option A describes File Notification mode (non-default), while Option B incorrectly implies querying all files (not incremental). Option C references webhooks and inferred rules, which are not part of Auto Loader. Option D correctly describes the default Directory Listing behavior.
Author: LeetQuiz Editorial Team
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What is the default execution mode of Databricks Auto Loader?
A
Cloud vendor-specific queue storage and notification services are configured to track newly arriving files; new files are incrementally and idempotently loaded into the target Delta Lake table.
B
New files are identified by listing the input directory; the target table is materialized by directly querying all valid files in the source directory.
C
Webhooks trigger a Databricks job to run anytime new data arrives in a source directory; new data are automatically merged into target tables using rules inferred from the data.
D
New files are identified by listing the input directory; new files are incrementally and idempotently loaded into the target Delta Lake table.
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