Relational and non-relational databases

When database choice is to be made, then it is possible to choose from two options. These options are relational and non-relational databases. Relational databases ensure consistency of the data stored in different databases tables. For example customer orders will ensure that customer record exists in the database.

Non-relational databases offload this functionality onto application front-end. It responsibility of the application to ensure that customer record exists before the order is saved.

If a web site becomes popular and receives more traffic then it is needed to install more performing machine in a case of relational database.

In case of non-relational database back-end, to handle more load is done by adding more servers.

Non-relational database scale better than relational databases, and it is a cheaper option. There may be time when relational database reaches the point of maximum capacity. To handle more load database records can be split.

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