Given a Performance Issue and Sample Code, Determine the Faulty Cache Configuration and Identify the Cause. B2C-COMMERCE-DEVELOPER Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   A B2C Commerce site has a cache expiration set to 1 minute for product pages. What is the most likely performance impact?

   • AImproved performance because users always see fresh content
   • BIncreased load on the origin server due to frequent cache misses
   • CNo impact because expiration only affects stale content
   • DDecreased load on the origin server because pages are refreshed often
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A developer is reviewing code that caches a list of related products. The cache key is `'related_' + product.ID`. The related products are updated by a recommendation engine that runs nightly. The developer notices that the related products list is always one day old. What is the most likely cause?

   • AThe cache key does not include the site ID.
   • BThe cache is not invalidated when the recommendation engine updates the related products.
   • CThe cache TTL is set to 24 hours.
   • DThe cache is using a local cache, so each application server has its own copy.
   Reveal Solution Discussion Select an answer first
4. 18expert · hard

   A B2C Commerce site has a custom controller that caches a product's inventory level. The cache key is `'inventory_' + product.ID`. The inventory is updated in real time by an external system. The site experiences high latency on the product detail page, and the developer suspects the cache is not being used effectively. Which change would most likely improve performance while keeping inventory reasonably fresh?

   • AAdd a cache dependency on the product.
   • BIncrease the cache TTL to 1 hour.
   • CUse a cache key that includes the inventory version number.
   • DSet a short TTL (e.g., 1 minute) and add a cache dependency on the inventory feed.
   Reveal Solution Discussion Select an answer first
5. 19expert · hard

   A B2C Commerce site has a custom controller that caches a product recommendation list. The cache key includes the product ID and the shopper's segment. The site experiences high latency on the recommendation widget, and the developer suspects the cache is not being used effectively. Which change would most likely improve performance?

   • AUse a cache dependency on the product ID to invalidate the cache when the product changes.
   • BRemove the shopper's segment from the cache key to increase cache hits.
   • CIncrease the cache TTL to 24 hours.
   • DMove the cache from a local cache to a shared cache.
   Reveal Solution Discussion Select an answer first
6. 20expert · hard

   A B2C Commerce site has a custom controller that caches a product list with a cache key that includes the category ID and the sort order. The site experiences high CPU usage on the product listing page. The developer notices that the cache hit rate is very low. Which change would most likely improve the cache hit rate?

   • AUse a cache key that includes the shopper's session ID.
   • BRemove the sort order from the cache key.
   • CAdd a cache dependency on the category.
   • DIncrease the cache TTL to 24 hours.
   Reveal Solution Discussion Select an answer first