The difference between relational database and non relational database

1、 Data storage is different .

The main difference between relational and non relational databases is the way data is stored . Relational data is naturally tabular , Therefore, it is stored in the rows and columns of the data table . Data tables can be associated with each other and stored cooperatively , It's also easy to extract data .

On the contrary , Non relational data is not suitable to be stored in rows and columns of the data table , It's big pieces together . Non relational data is usually stored in a dataset , It's like a document 、 Key value pairs or graph structures . Your data and its characteristics are the primary factors in choosing how to store and extract data .

2、 Different expansion methods .

SQL and NoSQL The biggest difference between databases may be in the way they are extended , To support growing demand, of course, expand .

To support more concurrency ,SQL The database is vertically extended , In other words, improve processing capacity , Use a faster computer , This makes it faster to process the same data set .

Because the data is stored in relational tables , The performance bottleneck of the operation may involve many tables , This needs to be improved by improving computer performance . although SQL The database has a lot of expansion space , But it will eventually reach the upper limit of vertical expansion . and NoSQL The database is scalable .

Non relational data storage is naturally distributed ,NoSQL The database can be expanded by adding more common database servers to the resource pool ( node ) To share the load .

3、 Support for transactional is different .

If the data operation needs high transaction or complex data query needs to control the execution plan , So traditional SQL Database is your best choice in terms of performance and stability .SQL The database supports fine-grained control over the atomicity of transactions , And it's easy to roll back transactions .

  although NoSQL Databases can also use transactional operations , But it can't compare with relational database in terms of stability , So their real value is in the scalability of operation and large amount of data processing .