Sometimes, we might need to use a certain item or set of items more frequently than others. Also, there is a good chance that lesser value updates will be made for such items. In this case, you can use caching to store items at cache level, and whenever required, you can simply fetch that from cache. The use of cache reduces the number of calls made to DynamoDB, hence improving the time and cost efficiency.

For example, you have a lookup table whose values are fixed and do not change over time, and there are a few items in that table that are very popular. In that case, you can simply use caching to store these items. For the very first time, when cache is blank, we would be fetching the data from the actual table itself.

The next time onwards, the program should check if the entry is present for the item in cache. If yes, then directly use that value...