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@ -1035,6 +1035,7 @@ Systems such as [Consul](https://www.consul.io/docs/index.html), [Etcd](https://
* Microservices can add complexity in terms of deployments and operations. * Microservices can add complexity in terms of deployments and operations.
### Source(s) and further reading ### Source(s) and further reading
### Nguồn đọc thêm
* [Intro to architecting systems for scale](http://lethain.com/introduction-to-architecting-systems-for-scale) * [Intro to architecting systems for scale](http://lethain.com/introduction-to-architecting-systems-for-scale)
* [Crack the system design interview](http://www.puncsky.com/blog/2016-02-13-crack-the-system-design-interview) * [Crack the system design interview](http://www.puncsky.com/blog/2016-02-13-crack-the-system-design-interview)
@ -1043,6 +1044,7 @@ Systems such as [Consul](https://www.consul.io/docs/index.html), [Etcd](https://
* [Here's what you need to know about building microservices](https://cloudncode.wordpress.com/2016/07/22/msa-getting-started/) * [Here's what you need to know about building microservices](https://cloudncode.wordpress.com/2016/07/22/msa-getting-started/)
## Database ## Database
## Cơ Sở Dữ Liệu
<p align="center"> <p align="center">
<img src="images/Xkm5CXz.png"> <img src="images/Xkm5CXz.png">
@ -1051,16 +1053,22 @@ Systems such as [Consul](https://www.consul.io/docs/index.html), [Etcd](https://
</p> </p>
### Relational database management system (RDBMS) ### Relational database management system (RDBMS)
### Hệ thống quản lí cơ sở dữ liệu quan hệ (RDBMS)
A relational database like SQL is a collection of data items organized in tables. Cơ sử dữ liệu quan hệ như SQL là một tập các mục dữ liệu được tổ chức vào trong các bảng.
**ACID** is a set of properties of relational database [transactions](https://en.wikipedia.org/wiki/Database_transaction). **ACID** là một tập hợp những tính chất của [giao dịch](https://en.wikipedia.org/wiki/Database_transaction) trong cơ sở dữ liệu quan hệ.
* **Atomicity** - Each transaction is all or nothing * **Atomicity** - Each transaction is all or nothing
* **Consistency** - Any transaction will bring the database from one valid state to another * **Consistency** - Any transaction will bring the database from one valid state to another
* **Isolation** - Executing transactions concurrently has the same results as if the transactions were executed serially * **Isolation** - Executing transactions concurrently has the same results as if the transactions were executed serially
* **Durability** - Once a transaction has been committed, it will remain so * **Durability** - Once a transaction has been committed, it will remain so
* **Atomicity** - Mỗi giao dịch hoặc là hoàn thành tất cả, hoặc là không gì cả
* **Consistency** - Bất kỳ giao dịch nào sẽ chuyển cơ sở dữ liệu từ một trạng thái đúng đắn này sang một trạng thái đúng đắn khác # FIXME: bad translation
* **Isolation** - Thực thi các giao dịch sẽ mang lại kết quả y như là nếu các giao dịch được thực thi một cách tuần tự
* **Durability** - Một khi giao dịch đã được cam kết (commit), nó sẽ tồn tại như nguyên
There are many techniques to scale a relational database: **master-slave replication**, **master-master replication**, **federation**, **sharding**, **denormalization**, and **SQL tuning**. There are many techniques to scale a relational database: **master-slave replication**, **master-master replication**, **federation**, **sharding**, **denormalization**, and **SQL tuning**.
#### Master-slave replication #### Master-slave replication