Do we need cache for the array?

Question

Since we are developing a web project using django. we cache the db operation to improve performance. But I'm wondering if we need a cache array.

sample code as follows:

ABigArray = {
  "1" : {
     "name" : "xx",
     "gender" "xxx",
     ...
   },
  "2" : {
     ...
   },
   ...
  }
 class Items:
     def __init__(self):
         self.data = ABigArray

     def get_item_by_id(self, id):
         item = cache.get("item" + str(id)) # get the cached item if possible
         if item:
             return item
         else:
              item = self.data.get(str(id))
              cache.set("item" + str(id), item)
              return item

So, I am wondering if we need such a cache, since the IMO array (ABigArray) will be loaded into memory when trying to get one element. So we don’t need to use the cache in this state, right? Or I'm wrong?

Please correct me if I am wrong.

Thanks.

Answer 1

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