Goroutine leaks can occur when a goroutine continues to run even after the surrounding function has returned. To prevent this, it's essential to ensure that all channels created within the goroutine are closed properly when they are no longer needed. This allows the garbage collector to reclaim the resources associated with the goroutine, preventing leaks and conserving memory.

Version control systems like Git are commonly used to manage changes to database migration scripts, allowing for tracking, collaboration, and rollback.

The correct option is "Query". The Query method is used to execute a SQL query that returns rows. It prepares the SQL statement and then executes it, returning a Rows result set for further processing.

In Go testing, 'Benchmark' functions are used specifically to measure the performance of code, typically by running it repeatedly. 'Example' functions, on the other hand, provide usage examples and are commonly utilized for generating documentation with the 'go doc' command. Finally, 'Test' functions are used for traditional unit testing, where various assertions are made to ensure the correctness of the code. Understanding the distinctions between these types of functions is crucial for effective testing in Go.

In Go, the '+' operator is used to concatenate strings. It concatenates two strings together to form a new string. The '&' operator is used for addressing, '*' for dereferencing, and '<<' for bit shifting.

The correct answer is ListenAndServe. This method creates a new HTTP server and sets it to listen on the specified network address. It starts accepting incoming connections and serving HTTP requests. It takes in an address and a handler, allowing you to specify the network address to listen on and the handler to use to handle requests. This method is commonly used to start serving HTTP traffic in Go applications.

Optimizing configuration parameters can enhance the efficiency of database connection pooling. By fine-tuning parameters such as connection timeout, idle timeout, and maximum connections, the system can optimize resource usage and performance.

In Go, the function used to create a new slice by slicing an existing array or slice is the slice function. This function takes the original slice/array and specifies a range to create a new slice. make is used to create slices, maps, and channels with a specified length and capacity. append is used to add elements to a slice. copy is used to copy elements from one slice to another.

The correct method in the 'reflect' package of Go to retrieve the type of a variable is TypeOf. This method returns a Type which represents the dynamic type of the interface{} argument. It's commonly used in scenarios where you need to inspect the type of a variable at runtime, such as in generic programming or when dealing with interfaces.

In the context of mocking, stubbing refers to replacing real implementations of methods or functions with predefined outputs or behaviors. This allows developers to control the behavior of dependencies during testing by providing specific responses to method calls. Stubbing is commonly used to isolate the unit under test from its dependencies, ensuring that tests focus on the specific functionality being tested without relying on the correctness of external components.