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@@ -1243,15 +1243,21 @@ In most systems, reads can heavily outnumber writes 100:1 or even 1000:1. A rea
* [Denormalization](https://en.wikipedia.org/wiki/Denormalization) * [Denormalization](https://en.wikipedia.org/wiki/Denormalization)
#### SQL tuning #### SQL tuning
#### Điều chỉnh (tuning) SQL
SQL tuning is a broad topic and many [books](https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=sql+tuning) have been written as reference. SQL tuning is a broad topic and many [books](https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=sql+tuning) have been written as reference.
Điều chỉnh SQL là một chủ đề rộng và có rất nhiều [quyển sách](https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=sql+tuning) đã viết về chủ đề này.
It's important to **benchmark** and **profile** to simulate and uncover bottlenecks. It's important to **benchmark** and **profile** to simulate and uncover bottlenecks.
**Benchmark** và **profile** là hai phương pháp quan trọng để tái tạo và phát hiện cổ chai.
* **Benchmark** - Simulate high-load situations with tools such as [ab](http://httpd.apache.org/docs/2.2/programs/ab.html). * **Benchmark** - Simulate high-load situations with tools such as [ab](http://httpd.apache.org/docs/2.2/programs/ab.html).
* **Benchmark** - Giả lập trạng thái tải cao với các công cụ như là [ab](http://httpd.apache.org/docs/2.2/programs/ab.html).
* **Profile** - Enable tools such as the [slow query log](http://dev.mysql.com/doc/refman/5.7/en/slow-query-log.html) to help track performance issues. * **Profile** - Enable tools such as the [slow query log](http://dev.mysql.com/doc/refman/5.7/en/slow-query-log.html) to help track performance issues.
* **Profile** - Bật các công cụ như là [slow query log](http://dev.mysql.com/doc/refman/5.7/en/slow-query-log.html) để theo dõi các vấn đề về hiệu năng.
Benchmarking and profiling might point you to the following optimizations. Benchmarking and profiling might point you to the following optimizations.
Benchmark và profile có thể sẽ chỉ ra được các phương thức tối ưu hoá sau.
##### Tighten up the schema ##### Tighten up the schema