Thinking about scaling beyond your Postgres cluster and adding another data store like Redis or Elasticsearch? Before adopting a more complex infrastructure, take a minute and think again. It’s quite possible to get more out of an existing Postgres database. It can scale for heavy loads and offers powerful features that are not obvious at first sight. For example, it's possible to enable in-memory caching, text search, specialized indexing, and key-value storage.
After reading this article, you may want to list down the features you want from your data store and check if Postgres will be a good fit for them. It’s powerful enough for most applications.