Why governance ensures data trust in dbt - Quick Recap

Recall & Review

beginner

What is data governance?

Data governance is a set of rules and processes that make sure data is accurate, secure, and used properly.

beginner

How does data governance improve data trust?

By setting clear rules and checks, data governance makes sure data is reliable and safe, so people can trust it.

beginner

Name one key role in data governance.

A data steward is a person who manages data quality and ensures rules are followed.

beginner

Why is data quality important for trust?

Good data quality means data is correct and complete, so decisions based on it are better and more trusted.

beginner

What role does documentation play in data governance?

Documentation explains where data comes from and how it is used, helping everyone understand and trust the data.

What is the main goal of data governance?

A To make data harder to access

B To delete old data regularly

C To create more data

D To ensure data is trustworthy and well-managed

Data governance aims to make data trustworthy and properly managed.

Which of these helps improve data trust?

A Ignoring data errors

B Setting clear data rules

C Sharing data without checks

D Using data without documentation

Clear data rules help keep data accurate and trusted.

Who is responsible for managing data quality?

A Data destroyer

B Data hacker

C Data steward

D Data consumer only

Data stewards manage data quality and governance.

Why is documentation important in data governance?

A It explains data origin and use

B It hides data sources

C It confuses users

D It deletes old data

Documentation helps users understand and trust data.

What happens if data quality is poor?

A Decisions may be wrong

B Data becomes more trusted

C Data governance is easier

D Data grows faster

Poor data quality can lead to wrong decisions.

Explain in your own words why data governance is important for trusting data.

Think about how rules and roles help keep data safe and correct.

Describe how poor data governance might affect a business decision.

Consider what happens if data is wrong or unclear.

Practice

1. Why is data governance important for building trust in data within a team?

easy

A. It removes the need for data documentation.

B. It makes data processing slower and more complex.

C. It hides data from most team members to avoid confusion.

D. It sets clear rules to keep data accurate and consistent.

Solution

1. Step 1: Understand the role of governance

   Governance creates rules and standards to ensure data is accurate and consistent.

2. Step 2: Connect governance to trust

   When data is accurate and consistent, teams can trust and confidently use it.

3. Final Answer:

   It sets clear rules to keep data accurate and consistent. -> Option D

4. Quick Check:

   Governance = Clear rules = Trust [OK]

Hint: Governance means clear rules for accurate data [OK]

Common Mistakes:

• Thinking governance slows down data use
• Believing governance hides data
• Assuming governance removes documentation

2. Which dbt feature directly supports data governance by checking data quality?

easy

A. dbt models

B. dbt tests

C. dbt snapshots

D. dbt seeds

Solution

1. Step 1: Identify dbt features

   dbt models build data tables, seeds load static data, snapshots track changes, tests check data quality.

2. Step 2: Match feature to governance

   Data governance needs quality checks, which dbt tests provide by validating data correctness.

3. Final Answer:

   dbt tests -> Option B

4. Quick Check:

   Tests = Quality checks = Governance support [OK]

Hint: Tests check data quality to support governance [OK]

Common Mistakes:

• Confusing models with tests
• Thinking snapshots check quality
• Assuming seeds validate data

3. Given this dbt test code snippet, what will be the result if the column user_id contains NULL values?

version: 2
models:
  - name: users
    columns:
      - name: user_id
        tests:
          - not_null

medium

A. The test will fail because NULL values exist in user_id.

B. The test will pass because NULLs are allowed.

C. The test will be ignored by dbt.

D. The test will cause a syntax error.

Solution

1. Step 1: Understand the not_null test

   This test checks that the specified column has no NULL values.

2. Step 2: Analyze the presence of NULLs

   If user_id contains NULLs, the test will detect them and fail.

3. Final Answer:

   The test will fail because NULL values exist in user_id. -> Option A

4. Quick Check:

   not_null test + NULL values = Fail [OK]

Hint: not_null test fails if any NULL found [OK]

Common Mistakes:

• Assuming NULLs pass not_null test
• Thinking test is ignored automatically
• Believing syntax error occurs

4. You wrote this dbt test to ensure no duplicate emails:

tests:
  - unique:
      column_name: email

But it does not run. What is the error?

medium

A. The test name should be unique without parameters.

B. The test should be written as - unique without column_name.

C. The test should be under the columns section with just - unique.

D. The test requires a SQL file, so this YAML is invalid.

Solution

1. Step 1: Check correct test syntax in dbt schema.yml

   Tests on columns go under the columns section with just - unique listed.

2. Step 2: Identify the mistake

   The test is incorrectly placed and uses column_name, which is not valid here.

3. Final Answer:

   The test should be under the columns section with just - unique. -> Option C

4. Quick Check:

   Unique test syntax = under columns with - unique [OK]

Hint: Place tests under columns with simple names [OK]

Common Mistakes:

• Using parameters like column_name in schema tests
• Placing tests outside columns section
• Thinking SQL files are needed for built-in tests

5. Your team wants to ensure data trust by documenting all models and adding tests in dbt. Which combination best supports governance?

hard

A. Write detailed model descriptions and add tests like not_null and unique on key columns.

B. Only add tests without documentation to save time.

C. Document models but skip tests since they slow down builds.

D. Use snapshots only to track data changes without tests or docs.

Solution

1. Step 1: Understand governance needs

   Governance requires both clear documentation and data quality checks to build trust.

2. Step 2: Evaluate options

   Write detailed model descriptions and add tests like not_null and unique on key columns. combines documentation and tests, supporting governance best. Others skip key parts.

3. Final Answer:

   Write detailed model descriptions and add tests like not_null and unique on key columns. -> Option A

4. Quick Check:

   Docs + tests = Strong governance [OK]

Hint: Combine docs and tests for best governance [OK]

Common Mistakes:

• Skipping docs or tests thinking one is enough
• Avoiding tests to speed builds
• Relying only on snapshots for trust