Firstly, We have to agree that if you are a software engineer and you are about to decide which database you will choose for your new application it is essential to have a good understanding of the underlying storage engine to reason about how the database actually delivers

We are going to talk about storage engines that are used in both traditional relational databases and NOSQL databases.

We will talk about the two most popular of the storage engines log-structured storage engines, and page-oriented storage engines.

The main idea about the storage engines is how it stores and retrieves the data and how the index is created to speed the performance of the reads.

We are going to start with the **Log-structured **storage engines and how it handles these operations.

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