Reflection in Go comes with significant performance overhead compared to direct method calls. This is because reflection involves runtime type introspection and dynamic dispatch, which incur additional runtime cost compared to statically typed languages or direct method calls where the compiler can optimize the code more aggressively. Therefore, while reflection offers flexibility, it should be used judiciously, especially in performance-critical code paths.

Gorm handles transactions in Go applications by providing methods like Begin, Commit, and Rollback to manually manage transactions. Transactions ensure that a group of database operations either all succeed or fail together, maintaining data consistency.

In Go, the 'byte' data type is used to represent a sequence of bytes. It is an alias for uint8 and is commonly used when dealing with binary data or when representing ASCII characters.

GoConvey is an excellent choice for teams new to Go programming. It comes with a simple syntax that closely resembles plain English, making it easy to write and understand tests. Additionally, GoConvey provides a web-based UI that displays test results in a visually appealing and easy-to-understand manner, which can be beneficial for teams getting started with testing in Go.

The "commit" operation in a database transaction is responsible for permanently applying the changes made within the transaction to the database. Once a transaction is committed, the changes become visible to other transactions, and they are durably stored in the database, ensuring data persistence. Committing a transaction signifies that all its operations have been successfully completed and are ready to be made permanent.

The correct answer is option 3, "struct". The json.Unmarshal function in Go decodes JSON data from a []byte slice into a Go data structure specified by a struct into which the data will be decoded.

Slices in Go are reference types. Unlike arrays, which are value types, slices are references to a contiguous segment of an array, allowing for dynamic sizing and sharing data between different slices.

In Go, a struct can contain methods as associated functions. These methods are defined with a receiver, which allows them to be called on instances of the struct type.

In Go benchmarking, the testing package provides the ReportAllocs() function to report memory allocations during benchmark execution, aiding in memory profiling.

Setting maximum connection limits prevents resource exhaustion in database connection pooling. By defining a maximum limit, the system ensures that there are not more connections than the system can handle, avoiding resource depletion.