How to optimize the database query in order to achieve the best speed

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Today's websites have completely eliminated the previous pure static websites. They basically have a complete backend management system. The website data is basically stored in the database. Common databases include mssql\mysql\access\oracle After several years of experience in the Suyou Network Program Department, it was found that the bottleneck of website speed lies in the connection between the website and the database. So what if database query can achieve the best effect? Suyou Network summarizes the following principles:

   1、The principle of using as much data as you use
1)Unless you really need to read everything, you must not use it. select *，Read which fields you need to read. Don't be lazy, because as much as you read, the database needs to transmit to the website, but broadband is limited.
2)Big data paging should not get all data and then paging it. This situation is for NET It's very common for beginners, mainly MSSQL\ACCESS Database paging does not have MYSQL It's so convenient to wait.

   2、Reduce continuous table query
The speed of continuous table query is the slowest, but it is often used. How to solve this problem? You can query the association table first. ID Then query the data of the data in a single table, or query the main query table data first, and then read the data in a continuous table. When the amount of data is larger, the more obvious the effect is.

   3、Add indexes to frequently queried tables in the database
1、Try to add one for each table INT type auto-increment primary key and then add index;
   2、Rega index that is frequently queried;

4、Optimize database structure and reduce unnecessary queries
The database structure is very important, and how to optimize depends on the specific situation. I will not explain it one by one here.

5、Cache frequently with infrequently updated data
For example, there is no need to query the database every time some base tables are read, and they can be cached completely

   Optimizing database query is very important for improving website opening speed and reducing server pressure.Website Programsa compulsory course for the staff.

   Suyou website construction focuses on creating the most complete website customization system, and customers are welcome to consult QQ:1193846053

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