Beyond @Transactional: Solving the Dual-Write Problem in Distributed Microservices

The Illusion of a Single Database In a traditional monolithic application, maintaining data consistency is straightforward. If you need to create a new order and update warehouse inventory, you wrap the logic inside a single database transaction: Java @Transactional public void placeOrder(OrderRequest request) { orderRepository.save(request.toOrder()); inventoryRepository.decrementStock(request.getItemId(), request.getQuantity()); }