Databricks Data Engineer Professional deep review — September 28, 2026

Read the complete guide and all 45 leaf objectives in the linked July 3, 2026 PDF. Ten weighted domains and lifecycle monitoring are unchanged; accepted snapshots remain intact. The PDF's organizing bullets are excluded from the count, and its split operations/overhead sentence is counted once. Vendor sample questions were not reproduced.

Improvements

The previously vague serverless retry objective now links the specific control, with environment/memory boundaries and a labeled bundle fragment. Added CDC ordering and per-key backfill cases, separate-destination recovery, CDF operation distinctions and physical-purge evidence. The aggregate example now imports its functions, preserves unmatched facts and requires dimension uniqueness. Five original failure cases and ten answered diagnostics connect these decisions.

The April 24 employee CDC article was evaluated as supplementary explanation. Its simplified examples must be checked against current sequencing and CDF contracts; they were not copied or represented as executed. Direct HTTP was blocked but web retrieval exposed the article.

Validation and limitations

Five SQLite assertions checked joins, unknown members, duplicate dimension inflation and empty input. Eight toy-model assertions checked partial two-sink writes, replay and checkpoint identity reset. One Python example and one YAML fragment parsed. These are bounded local checks, not Spark/Delta or Databricks service execution. All eight service labs remain proposed.

Public Academy and resource listings were checked without accessing paid lessons. Udemy/OReilly blocked direct access; Whizlabs returned no useful body. Planning durations remain qualified estimates. No material vendor-source contradiction remains from this review; independent human review remains pending. The operational receipt holds the PDF hash, objective mappings, source access evidence and validation results.