Best Practices and Performance B2C-COMMERCE-DEVELOPER Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   Which resource management practice is a scalability best practice in B2C Commerce?

   • ACreating a new connection for each query without closing it
   • BStoring large data in session variables
   • CKeeping database connections open for the entire session
   • DReleasing database connections after use
   Reveal Solution Discussion Select an answer first
2. 7expert · hard

   A developer is optimizing a batch job that processes 100,000 orders to update their status. The job currently runs sequentially and takes 2 hours. The business wants the job to complete within 30 minutes. The developer has access to multiple application instances. Which approach best achieves the goal?

   • AUse a single database transaction to update all orders at once.
   • BOptimize the database queries used in the job to reduce the time per order.
   • CSplit the orders into 4 batches and process each batch on a separate instance concurrently.
   • DUse a single instance but increase the timeout to allow the job to run longer.
   Reveal Solution Discussion Select an answer first
4. 8expert · hard

   A developer is refactoring a service that retrieves product data from an external API and caches it in a custom object. The current implementation uses a TTL of 24 hours. The business has a new requirement that product data must be updated within 1 hour of a change in the external system. Which refactoring approach best meets the requirement while minimizing API calls?

   • ARemove the cache entirely and always call the external API.
   • BImplement a webhook from the external system to invalidate the cache when data changes.
   • CReduce the TTL to 1 hour and keep the existing cache invalidation logic.
   • DUse a shorter TTL of 30 minutes to ensure data is fresh.
   Reveal Solution Discussion Select an answer first
5. 9expert · hard

   A B2C Commerce developer is designing a solution for a flash sale event where thousands of users will simultaneously attempt to purchase a limited number of items. The current implementation checks inventory synchronously in the controller and then processes the order. The developer is concerned about overselling and performance degradation. Which solution best addresses both concerns?

   • AUse a distributed lock (e.g., via a queue or cache) around the inventory check and decrement operation.
   • BIncrease the number of application instances to handle the load and rely on the database to enforce inventory limits.
   • CPre-calculate the available inventory and cache it, then decrement the cached value on each purchase.
   • DUse an asynchronous queue to process orders and check inventory in the background.
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   Which code practice is considered a violation of B2C Commerce best practices?

   • AUsing a cache to store frequently accessed data
   • BUsing a custom object to store session data
   • CUsing a template to render a product page
   • DUsing a service to retrieve data from an external system
   Reveal Solution Discussion Select an answer first