What is meant by the term "isolation level" in the context of database transactions?
- The degree to which the operations within a transaction are isolated from the concurrent operations of other transactions.
- The level of encryption applied to data during transmission over a network.
- The method used to index database tables for faster search operations.
- The time duration for which a transaction can hold a lock on a database resource.
In the context of database transactions, isolation level refers to the degree to which the operations within a transaction are isolated from the concurrent operations of other transactions. It determines the level of concurrency and data consistency in a database system.
What are some best practices for using 'panic()', 'recover()', and 'defer' in Go?
- Always recover from every panic
- Ensure 'recover()' is called before 'defer'
- Use 'panic()' liberally for all errors
- Use 'panic()' sparingly for unrecoverable errors
Best practices for using 'panic()', 'recover()', and 'defer' in Go include using 'panic()' sparingly for unrecoverable errors, always recovering from every panic using 'defer' and 'recover()', and ensuring that 'recover()' is called within a deferred function. Using 'panic()' excessively or failing to recover from panics can lead to unexpected program termination.
Which function is commonly used in Go to handle errors by logging them and exiting the program?
- errors.New
- fmt.Println
- log.Fatal
- panic
In Go, the function commonly used to handle errors by logging them and exiting the program is 'log.Fatal'. This function logs the error message and terminates the program.
In Go's database/sql package, the _______ method is used to begin a transaction.
- BeginTransaction()
- InitiateTransaction()
- OpenTransaction()
- StartTransaction()
The correct method to begin a transaction in Go's database/sql package is Begin(). This method returns a Tx object representing the transaction. It's crucial to initiate a transaction before executing multiple SQL statements to ensure atomicity and consistency. The Begin() method initializes and returns a Tx object, allowing you to execute SQL statements within the transaction scope.
You're developing a high-performance application that requires handling large sets of floating-point numbers with the highest precision possible. Which data type would you use for this purpose?
- decimal
- double
- float32
- float64
The float64 data type provides the highest precision for floating-point numbers in Go. It is suitable for handling large sets of floating-point numbers with the utmost precision, crucial for high-performance applications.
The _______ testing framework in Go is known for its simplicity and ease of use, especially for beginners.
- Ginkgo
- Gomock
- Gotest
- Gunit
Gotest, also known as the Go testing package, is the standard testing framework in Go. It is simple to use and comes bundled with the Go programming language. Gotest is widely used and is suitable for beginners.
Monitoring _______ metrics is essential for identifying and resolving connection pool issues.
- Latency
- Performance
- Throughput
- Utilization
Monitoring utilization metrics of the connection pool provides insights into its efficiency and capacity usage, enabling timely resolution of issues to maintain optimal performance.
In type assertion, what happens if the assertion fails in Go?
- AssertionError is raised
- Compilation error
- Panic occurs
- nil is returned
In Go, if the type assertion fails, it will cause a panic. This means that if the type assertion does not hold true at runtime, the program will panic and may terminate abruptly. Therefore, it's essential to handle type assertion failures appropriately to avoid unexpected crashes in Go programs.
The advantage of using Gorilla Mux over the default HTTP router in Go is its _______.
- Compatibility
- Flexibility
- Performance
- Simplicity
One of the key advantages of Gorilla Mux over the default HTTP router in Go is its flexibility. Gorilla Mux provides more advanced routing features, such as route patterns and constraints, which enhance flexibility.
You're developing a web application in Go and encounter a runtime panic due to a nil pointer dereference. How would you handle this error gracefully?
- Check for nil pointers explicitly before dereferencing.
- Implement error logging and recovery mechanisms.
- Return an error value indicating the nil pointer.
- Use defer and recover to catch and handle the panic.
Handling nil pointer dereference errors gracefully in Go requires explicit checking for nil pointers before attempting to dereference them. This helps avoid runtime panics. Implementing error logging and recovery mechanisms can also aid in gracefully handling such errors and preventing application crashes.