How does the use of database locks impact transaction concurrency and performance?
- Deadlocks
- Improved scalability
- Increased concurrency
- Reduced contention
While database locks ensure data integrity by preventing concurrent access to shared resources, they can also lead to deadlocks, where two or more transactions are waiting for each other to release locks, causing a stalemate. This reduces concurrency and can degrade performance. To mitigate deadlocks, databases employ strategies such as deadlock detection and resolution, lock timeouts, and lock escalation.
In Go, it is a best practice to place tests in a file named _______.
- go_test.go
- test.go
- test_cases.go
- testing.go
In Go, it is a common convention to name test files with the suffix "_test.go". This helps in distinguishing test files from regular source code files. Using this convention makes it easier to organize and manage tests within a project.
The _______ operation in a transaction is used to permanently save the changes made during the transaction.
- Begin
- Commit
- Rollback
- Savepoint
The Commit operation in a transaction is crucial as it finalizes the changes made during the transaction and makes them permanent in the database. It ensures that the changes are durable and will persist even in the event of system failures.
Which NoSQL database is known for its high performance, reliability, and ability to handle large volumes of data, often used for real-time analytics?
- Cassandra
- Couchbase
- MongoDB
- Redis
Cassandra is a distributed NoSQL database designed for high scalability, fault tolerance, and performance. It's commonly used in applications requiring high availability and real-time analytics due to its ability to handle large volumes of data with low latency.
In Go templating, what is the significance of the "." (dot) operator?
- Accessing fields/methods of the current context
- Accessing global variables
- Importing external packages
- Looping over arrays/slices
In Go templating, the "." (dot) operator is used to access fields and methods of the current context, such as variables passed to the template during execution.
In Go, '_________' is a built-in interface type used to represent any value that can describe itself as a string.
- fmt.Stringer
- printable
- stringable
- stringer
The 'fmt.Stringer' interface in Go represents any type that can describe itself as a string. It has a single method 'String()' that returns a string representation of the object implementing the interface.
In a large-scale e-commerce platform, multiple users are trying to purchase the same limited-stock item simultaneously. How would you handle concurrent transactions to ensure fair access and prevent overselling?
- Implementing a Reservation System
- Optimistic Locking
- Rate Limiting Purchases
- Using a Queue for Order Processing
To address concurrent purchases of limited-stock items, implementing a reservation system is effective. This involves temporarily reserving stock for a user during the checkout process, ensuring fair access and preventing overselling by managing stock availability in real-time.
Which of the following elements is used to create a hyperlink in HTML?
_______ is a popular assertion library used in Go for testing.
- assert
- assert.go
- check
- testify
testify is a popular assertion library in Go used for writing tests. It provides various assertion functions that make it easier to write expressive and readable test cases. Using testify simplifies the process of writing and maintaining test code in Go.
In database migration, the 'down' method is responsible for _______ the database schema.
- Creating
- Deleting
- Reverting
- Updating
Reverting
In Go, methods are primarily used for what purpose?
- Code organization
- Data encapsulation
- Error handling
- Function reusability
Methods in Go are primarily used for code organization, allowing related functionality to be grouped together.
What is benchmarking used for in Go?
- Code optimization
- Debugging
- Performance analysis
- Syntax checking
Benchmarking in Go is primarily used for performance analysis. It helps developers identify bottlenecks and inefficiencies in their code by measuring the execution time of specific functions or code blocks. This is crucial for optimizing the performance of Go programs.