What does V-ORDER do?

What does V-ORDER do?

• A. Consolidates multiple Parquet files into a large file
• B. Removes old files no longer referenced by a Delta table log
• C. Applies optimized sorting, encoding, and compression to Delta parquet files to enable fast read operations
• D. Allows users to reference data without copying it

Answer: (C)

V-ORDER is about how Delta Lake lays out data inside Parquet files to speed up reads. By applying an optimized arrangement (sorting by key columns) and choosing efficient encoding and compression, the data that a query needs becomes more localized and compact. That means the system can skip more irrelevant data blocks and read less data overall, leading to faster query performance. The underlying idea is that a well-ordered, efficiently encoded/compressed Parquet file reduces I/O and CPU during scans, especially for common filter predicates. The other options describe tasks like consolidating files, cleaning up old ones, or referencing data without copying, which aren’t about improving read speed through data layout.

V-ORDER is about how Delta Lake lays out data inside Parquet files to speed up reads. By applying an optimized arrangement (sorting by key columns) and choosing efficient encoding and compression, the data that a query needs becomes more localized and compact. That means the system can skip more irrelevant data blocks and read less data overall, leading to faster query performance. The underlying idea is that a well-ordered, efficiently encoded/compressed Parquet file reduces I/O and CPU during scans, especially for common filter predicates. The other options describe tasks like consolidating files, cleaning up old ones, or referencing data without copying, which aren’t about improving read speed through data layout.