In SQL, the ALTER TABLE command is used to _______ an existing database table.
- Add
- Delete
- Modify
- Update
The ALTER TABLE command in SQL is used to modify an existing database table. It allows you to add, delete, or modify columns and constraints of a table.
You're designing a software system where you need to model different types of vehicles. Explain how you would utilize OOP concepts such as inheritance and polymorphism in this scenario.
- Abstraction for code reuse and Inheritance for encapsulation
- Encapsulation for security and Abstraction for complexity
- Inheritance for code reuse and Polymorphism for flexibility
- Polymorphism for security and Inheritance for flexibility
In this scenario, Inheritance can be used to model the common attributes of vehicles in a base class, and Polymorphism allows you to use a single interface for various types of vehicles, enabling flexibility and maintainability.
When planning data migration, what role does data profiling play?
- Analyzing Data Structure
- Assessing Data Quality
- Evaluating Network Speed
- Identifying Data Owners
Data profiling plays a crucial role in planning data migration by assessing the quality of the data. It involves analyzing the structure, integrity, and completeness of the data to identify potential issues that may impact the migration process. This proactive step helps in creating a more accurate migration plan and ensuring successful data transfer.
In database management, what is cardinality, and how does it impact query optimization?
- The number of rows in a table
- The relationship between tables
- The size of the database
- The uniqueness of values in a column
Cardinality in database management refers to the relationship between tables. It impacts query optimization by influencing the choice of join algorithms and the order in which tables are accessed, crucial for performance.
You encounter a bug in your codebase. How would you use TDD principles to fix it and prevent similar issues in the future?
- Fix the bug directly without writing tests
- Ignore the bug and focus on adding new features
- Write a failing test that reproduces the bug, fix the bug, and ensure the test passes
- Write tests for unrelated features to cover more code paths
Using TDD to fix a bug involves writing a failing test that reproduces the issue, then fixing the bug to make the test pass. This ensures that the bug is addressed and helps prevent regressions by having a test in place.
In a project, you have a table with millions of records, and your queries are taking too long to execute. What strategies would you employ to optimize the performance of the database?
- Indexing and Query Optimization
- Denormalization and Partitioning
- Caching and Replication
- Sharding and Vertical Scaling
To optimize the performance of a database with millions of records, strategies such as indexing, query optimization, denormalization, partitioning, caching, and replication can be employed. The correct option focuses on indexing and query optimization.
Which HTTP method is typically used for creating a new resource in a RESTful API?
- DELETE
- GET
- POST
- PUT
The HTTP method used for creating a new resource in a RESTful API is POST. It submits data to be processed to a specified resource.
What is the role of alerting in a monitoring system?
- Archive historical data
- Display real-time data
- Generate reports
- Notify stakeholders about abnormal conditions
The primary role of alerting in a monitoring system is to notify stakeholders about abnormal conditions or events. Alerts enable timely responses to issues, helping in proactive troubleshooting and maintaining system reliability.
The "Application" tab in Browser Developer Tools is used for managing _______.
- Application-related resources
- Code syntax
- Memory and storage
- Network requests
The "Application" tab in Browser Developer Tools is used for managing application-related resources. It includes features for working with local storage, session storage, cookies, and other application-specific data.
Materialized views are often employed in query optimization to store _______.
- Aggregated data
- Intermediary results
- Precomputed results
- Temporary data
Materialized views in query optimization are used to store precomputed results. This involves storing the output of a query in a physical table, which can significantly improve the performance of complex queries by reducing the need for repeated computations.