DMC Study Guide 2026
Everything you need to pass the DMC exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
DMC exam key facts
- The Data Modeling Certification exam consists of 100 multiple-choice questions. Source
- The time limit for the Data Modeling Certification exam is 90 minutes, or 120 minutes for candidates whose second language is English. Source
- The passing score for the Data Modeling Certification exam is 85. Source
- The Data Modeling Certification exam fee is $299. Source
- Candidates who fail their first Data Modeling Certification attempt are permitted a second attempt between three and five weeks later. Source
📋 DMC Exam Format at a Glance
📚 DMC Topics to Study (20)
✍️ Sample DMC Questions & Answers
1. What is a slowly changing dimension (SCD) Type 1?
SCD Type 1 handles changes by overwriting the old attribute value with the new one, which is simple but destroys historical data — appropriate when history is not needed.
2. In an ERD, what does the notation '1' on one side and 'M' on the other side of a relationship line indicate?
The 1:M notation indicates a one-to-many relationship where one instance of the first entity can relate to many instances of the second.
3. What is the primary purpose of a data quality scorecard in enterprise data modeling?
A data quality scorecard provides a structured view of quality metrics versus targets, enabling stakeholders to track and improve data health over time.
4. What does GDPR require of data models that store personal data of EU residents?
GDPR requires that data systems support the right to access, rectify, port, and erase personal data — data models must be designed to accommodate these rights technically.
5. What is the primary goal of a conceptual data model?
A conceptual data model captures major business entities and relationships at a high level, focusing on what the business needs to track rather than how data will be stored.
6. Which ERD notation style uses rectangles for entities, diamonds for relationships, and ovals for attributes?
Chen notation, developed by Peter Chen in 1976, uses rectangles for entities, diamonds for relationships, and ovals for attributes in its ERD representation.
🎯 Free DMC Practice Tests
📖 DMC Guides & Articles
What Practice Test Geeks adds beyond an AI chat for DMC
An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:
- A timed, full-length DMC mock exam — 100 questions in 90 minutes with a 85% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
- A fixed DMC question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
- Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
- A printable DMC cheat sheet you can print or save as a PDF.
- DMC flashcards built from the same question bank.
- Free DMC practice tests with the correct answer shown after each question.
How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy
Sources & references
Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy
- technicspub.com — Test delivery, eligibility, fees, exam format, passing score, retake policy, score release, time limit, exam information · verified Oct 2026