Quiz for Schema Design Best Practices

Q1: What is recommended when designing relational schemas?

A. Use long table names B. Avoid indexing C. Minimize redundancy D. Duplicate data for backup

Q2: Which of the following helps eliminate data redundancy in schema design?

A. Normalization B. Indexing C. Partitioning D. Denormalization

Q3: What is the recommended approach when naming tables in a relational schema?

A. Use plural nouns B. Use camelCase C. Use singular nouns D. Use table_ prefix

Q4: Which key should be defined to ensure each record in a table is unique?

A. Primary Key B. Foreign Key C. Alternate Key D. Composite Key

Q5: Why should foreign keys be used in database schema design?

A. To improve performance B. To create indexes automatically C. To enforce referential integrity D. To generate primary keys

Q6: Which of the following is a good practice when designing relational schemas?

A. Use large text fields for all columns B. Store images directly in tables C. Avoid NULLs when possible D. Use the same name for all foreign keys

Q7: Which design principle promotes breaking large tables into smaller ones?

A. Indexing B. Denormalization C. Sharding D. Normalization

Q8: Why should data types be carefully chosen during schema design?

A. They affect table color B. They affect query execution plans C. They control user access D. They help in GUI layout

Q9: Which constraint ensures that a column cannot have NULL values?

A. UNIQUE B. NOT NULL C. DEFAULT D. CHECK

Q10: Which of the following is considered a bad practice in schema design?

A. Using consistent naming conventions B. Defining primary keys C. Storing multiple values in one column D. Using foreign key constraints

Q11: What is the main goal of a well-designed schema?

A. To allow frequent table alterations B. To store data in a single table C. To ensure data is secure from SQL injection D. To make data easy to access and maintain

Q12: What is a key principle of good database schema design?

A. Denormalization first B. Avoid foreign keys C. Normalization D. Flat table structures

Q13: Why is normalization important in schema design?

A. It reduces indexes B. It increases redundancy C. It avoids data duplication D. It makes queries faster

Q14: Which design principle helps improve query performance?

A. Use of flat files B. Redundant columns C. Proper indexing D. Storing images in tables

Q15: Which type of key should be stable and not change over time?

A. Foreign Key B. Primary Key C. Candidate Key D. Surrogate Key

Q16: What is the purpose of using surrogate keys?

A. To replace foreign keys B. To avoid natural keys C. To reduce joins D. To generate unique identifiers

Q17: Which is NOT a benefit of normalization?

A. Minimized redundancy B. Improved data integrity C. Simplified queries D. Avoidance of anomalies

Q18: What is a drawback of excessive normalization?

A. Data duplication B. Slower data access C. Lack of consistency D. Schema instability

Q19: Which of the following is true about denormalization?

A. It improves data integrity B. It always leads to better design C. It may increase redundancy D. It removes primary keys

Q20: Which factor is important for choosing data types in schema design?

A. Color of the UI B. Storage size and accuracy C. Developer preference D. Font size

Q21: What is a best practice for choosing a primary key?

A. Use a large string B. Use a natural key C. Use a surrogate key D. Use a volatile column

Q22: Why should foreign keys be used?

A. To increase performance B. To enforce referential integrity C. To eliminate indexes D. To flatten tables

Q23: Which tool is commonly used to visualize schema design?

A. SQL Editor B. ER Diagram C. Command Line D. Debugger

Q24: Why should data types be chosen carefully?

A. To look pretty B. To confuse users C. To ensure storage efficiency and accuracy D. To avoid using indexes

Q25: Which is NOT a best practice in schema design?

A. Normalization B. Proper indexing C. Consistent naming D. Duplicate data

Q26: Which of the following improves performance in a read-heavy schema?

A. Use of triggers B. Indexes C. Stored procedures D. Views

Q27: Why avoid using NULLs unnecessarily?

A. They make databases faster B. They save disk space C. They complicate logic and constraints D. They improve joins

Q28: What is a composite key?

A. A key with NULL values B. A key made of multiple columns C. A key with string data D. A key without constraints

Q29: Why avoid using reserved keywords as column names?

A. They are long B. They cause syntax errors C. They are fast D. They reduce memory

Q30: Which of the following helps with scalability in schema design?

A. Tight coupling B. Denormalization C. More foreign keys D. Flat tables

Q31: What is meant by schema evolution?

A. Dropping the database B. Adding redundant data C. Changing the schema structure over time D. Creating static tables

Q32: Which naming convention is recommended in schema design?

A. CamelCase B. Snake_case C. UPPERCASE D. Random

Q33: What should be avoided in a normalized schema?

A. Surrogate keys B. Duplicate rows C. Foreign keys D. Constraints

Q34: Which of these can improve write performance?

A. Normalization B. Indexing all columns C. Partitioning D. Triggers

Q35: Why use constraints in schema design?

A. To limit access B. To enforce rules on data C. To increase storage D. To slow down queries

Q36: What is sharding in database schema?

A. Using small tables B. Breaking a database into multiple parts C. Removing foreign keys D. Converting to NoSQL

Q37: What is the role of unique constraints?

A. Avoid NULLs B. Prevent duplicate values C. Improve joins D. Reduce indexes

Q38: When is denormalization recommended?

A. Always B. Never C. When read performance is critical D. When data is inconsistent

Q39: What does indexing improve?

A. Write performance B. Security C. Read performance D. Data modeling

Q40: What is a best practice regarding table relationships?

A. Avoid foreign keys B. Use cascading deletes mindfully C. Create circular references D. Use only views