Big Data

Delta Lake: ACID Transactions on Spark

Standard Parquet files lack version control. Delta Lake is now the industry standard for Lakehouse architectures. Perform a Time Travel query to restore a dataset to its state from 24 hours ago using Delta logs.

Level: AdvancedBig Data

What You'll Learn

Why Parquet files fail at scale: no ACID, no versioning
Delta Lake architecture: transaction log and checkpoints
ACID transactions: insert, update, delete on Spark
Time Travel: querying historical versions of a table
Schema evolution and enforcement
Restoring a dataset to a previous state
Delta Lake vs Apache Iceberg vs Apache Hudi

What's Included

🧭AI Tutor🔒

Interactive learning path with AI-generated lessons read aloud by your personal tutor

🧪Practice Lab🔒

Step-by-step lab instructions with AI guidance — run in your own IDE or sandbox.

🎙️Mock Interviews🔒

AI interviewer asks tailored questions, gives real-time feedback and a score report

📝Evaluation🔒

MCQ questions (theory, practical, code) to test your knowledge and earn a badge

⚔️Challenge AI🔒

Compete head-to-head against AI on real production problems — judged on correctness, performance, scalability, code quality, and edge cases

Course Syllabus

Module 1: Delta Lake Fundamentals

  • •Parquet limitations: no updates, no versioning, no ACID
  • •Delta Lake architecture: the transaction log (_delta_log)
  • •How Delta achieves ACID on distributed storage
  • •Delta table format: data files + log files
  • •Delta Lake vs Iceberg vs Hudi: when to use each

Module 2: ACID Operations

  • •Writing a Delta table from a Spark DataFrame
  • •Upserts with MERGE INTO
  • •DELETE and UPDATE on Delta tables
  • •Schema enforcement: rejecting incompatible writes
  • •Schema evolution: adding new columns safely

Module 3: Time Travel & Restore

  • •Reading a table at a specific version or timestamp
  • •DESCRIBE HISTORY: viewing the full audit log
  • •Restoring a table to a previous snapshot
  • •Vacuuming old files: storage trade-offs
  • •Capstone: 24-hour time travel restore and audit trail

You're all set

Everything in this course is unlocked.

Continue Learning →
✓AI Tutor
✓Practice Lab
✓Mock Interviews
✓Evaluation
✓Challenge AI