Which programming construct is commonly used for catching and handling errors in JavaScript?
- For loop
- If...Else statement
- Switch statement
- Try...Catch statement
In JavaScript, the Try...Catch statement is commonly used for catching and handling errors. It allows developers to execute code that might generate errors and gracefully handle them without disrupting the entire program flow.
MongoDB is an example of a _______ database.
- Document-oriented
- Graph
- Key-value
- Relational
MongoDB is an example of a document-oriented database. It stores data in flexible, JSON-like documents, making it suitable for a variety of data models.
How does the query execution plan contribute to query optimization?
- It automatically optimizes queries
- It helps in organizing query execution steps
- It only displays results
- It reduces the number of tables in a query
The query execution plan organizes the steps for executing a query, helping to optimize performance. It provides insights into how the database engine will access tables and process data, aiding developers in fine-tuning queries.
A unique constraint ensures that _______ values are stored in a column.
- Duplicate
- Incremental
- Null
- Unique
A unique constraint ensures that unique values are stored in a column, preventing the insertion of duplicate values. It helps maintain data integrity by enforcing uniqueness.
What is the role of consistency level in distributed databases like Cassandra?
- Defines the uniqueness of values in a column
- Determines how up-to-date a read is required to be
- Manages the order of write operations
- Specifies the type of database consistency
The consistency level in distributed databases like Cassandra determines how up-to-date a read must be. It allows users to balance between the consistency and availability of the data in a distributed environment.
What is a potential drawback of using a centralized version control system compared to a distributed one like Git in terms of branching and merging?
- Increased risk of data loss
- Lack of branching and merging capabilities
- Limited offline functionality
- Slower performance for large repositories
One potential drawback of centralized version control systems is their dependency on a central server. If the server is unavailable or if the developer is offline, certain operations may be limited or not possible, hindering productivity.
Azure _______ is a service for creating, deploying, and managing applications and services through a global network of Microsoft-managed data centers.
- App Service
- Blob Storage
- SQL Database
- Virtual Network
Azure App Service is a platform-as-a-service (PaaS) offering that enables you to build, deploy, and scale web apps. It provides automatic scaling and is part of Microsoft's global infrastructure for reliable application hosting.
The _______ model emphasizes the continuous integration of software development and operations processes.
- Agile
- DevOps
- Spiral
- Waterfall
The correct answer is DevOps. DevOps is a set of practices that combines software development (Dev) and IT operations (Ops) to enhance collaboration and productivity by automating infrastructure, workflows, and continuously measuring application performance. It emphasizes the integration of development and operations throughout the entire software development lifecycle.
What is the primary goal of the maintenance phase in the SDLC?
- Enhancing System Functionality
- Evaluating User Satisfaction
- Extending System Capabilities
- Fixing Defects and Issues
The primary goal of the maintenance phase in the SDLC is to fix defects and issues identified during the testing and production phases. It involves addressing software bugs, making necessary updates, and ensuring the continued reliability and performance of the software over time.
You're working on a team project where multiple developers are contributing code. Describe how you would use OOP concepts like encapsulation and abstraction to ensure code integrity and modularity.
- Abstraction for security and Encapsulation for modularity
- Encapsulation to hide internal details and Abstraction to reduce complexity
- Inheritance for code sharing and Polymorphism for flexibility
- Inheritance for encapsulation and Polymorphism for modularity
Encapsulation hides the internal details of a class, ensuring code integrity, while Abstraction reduces complexity by providing a simplified interface. This combination enhances code modularity in a collaborative development environment.