Database transactions Laravel

 A transaction guarantees that a group of database operations succeeds or fails together.

Laravel:

DB::transaction(function () use ($orderData) {

    $order = Order::create($orderData);

    $order->items()->createMany($items);

    Payment::create([
        'order_id' => $order->id,
        'amount' => $order->total,
    ]);
});

If an exception occurs, Laravel rolls back the transaction.

Scenario

Creating an order may involve:

Create order
↓
Create order items
↓
Decrease inventory
↓
Create payment record

If inventory update fails after the order was created, we don't want a half-created order.

A transaction gives us atomicity.

For critical financial/inventory workflows, I also consider locking and isolation behavior rather than assuming a transaction alone prevents race conditions.