In Google Cloud Platform, what service is used for big data analytics?
- BigQuery
- Cloud Storage
- Datastore
- Pub/Sub
BigQuery is the Google Cloud Platform service specifically designed for big data analytics. It enables super-fast SQL queries using the processing power of Google's infrastructure, making it suitable for analyzing large datasets.
NoSQL databases are often used in scenarios where _______.
- ACID compliance is required
- Data is highly structured
- Scalability and high-performance are crucial
- Schema is predefined
NoSQL databases are often used in scenarios where scalability and high-performance are crucial. They excel in handling large volumes of unstructured or semi-structured data with a focus on horizontal scaling.
You're working on a team project, and your feature branch diverged significantly from the main branch. Which Git command would you use to integrate your changes without creating a messy merge history?
- git merge --no-ff
- git merge --squash
- git pull --rebase
- git rebase
The correct Git command to integrate changes from a diverged feature branch without creating a messy merge history is git rebase. It helps maintain a linear and cleaner history by incorporating the changes on top of the main branch.
What does the === operator do in JavaScript?
- Assignment
- Logical AND
- Strict equality comparison
- Type coercion equality comparison
The === operator in JavaScript performs strict equality comparison, meaning it checks both value and type. It returns true if the operands are equal without performing type coercion.
Which command is used to create a new branch in Git?
- git add
- git branch
- git checkout -b
- git commit -m
The command git checkout -b is used to create a new branch in Git. This command creates a new branch with the specified name and switches to it, allowing developers to start working on a new feature or bug fix.
Which SDLC model is known for its linear sequential flow of phases?
- Agile Model
- Spiral Model
- V-Model
- Waterfall Model
The Waterfall Model is known for its linear sequential flow of phases. In this model, each phase must be completed before the next one begins, making it a straightforward and easy-to-understand approach. However, it may lack flexibility compared to other models.
Which caching strategy is suitable for reducing database load and improving response times for frequently accessed data?
- Browser Caching
- Content Delivery Network (CDN) Caching
- Database Caching
- Object Caching
Database Caching is a caching strategy suitable for reducing database load and improving response times for frequently accessed data. It involves storing query results or data in memory to avoid repeated database queries for the same data.
In RESTful APIs, _______ is a mechanism used to control access to resources.
- Authentication
- Authorization
- Decryption
- Encryption
In RESTful APIs, Authorization is a mechanism used to control access to resources. It determines whether the authenticated user has the necessary permissions to perform a particular action on a resource.
A stored procedure is _______ in a relational database, which can be executed by invoking its name.
- a precompiled collection of one or more SQL statements
- a temporary table
- a trigger
- an index
A stored procedure in a relational database is a precompiled collection of one or more SQL statements. It is stored as a database object and can be executed by invoking its name.
Imagine a scenario where two users are trying to update the same record in a database concurrently. Describe the potential issues that may arise and propose a concurrency control strategy to address them.
- Issues: Deadlocks, Race Conditions
- Issues: Lost Updates, Inconsistent Data
- Strategy: Apply Pessimistic Locking
- Strategy: Use Timestamps for Versioning
Concurrent updates on the same database record may lead to issues such as lost updates and inconsistent data. Using timestamps for versioning is a strategy to address this, allowing the system to track and compare versions to ensure updates occur in a controlled and consistent manner, reducing conflicts.