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This article mainly introduces how to optimize the database, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

Database optimization methods: 1, select the most applicable field properties; 2, use connections to replace subqueries; 3, use unions instead of manually created temporary tables; 4, transactions; 5, lock tables; 6, use foreign keys.

How to optimize the database:

The first method: select the most applicable field properties. MySQL can support access to a large amount of data, but the smaller the table in the database, the faster the query is executed on it. So you can set the width of the fields in the table as small as possible. The figure shows an example of this method.

The second method: replace the subquery (Sub-Queries) with a join. You can use the select statement to create a single-column query result, and then use that result as a filter condition in another query. The figure shows an example of this method.

The third method: use UNION instead of manually created temporary tables. MySQL can merge two or more select queries that need to use temporary tables into one query. The figure shows an example of this method.

The fourth method: transaction. Not all database operations can be done with one or a few SQL statements. More often, you need to use a series of statements to accomplish some kind of work. The integrity and consistency of the data in the database can be maintained. The figure shows an example of this method.

The fifth method: lock the table. Because the database will be locked during the execution of the transaction, other user requests can only wait temporarily until the transaction ends. In some cases we can achieve better performance by locking the magnification of the table. The figure shows an example of this method.

The sixth method: use foreign keys. The method of locking the table can protect the integrity of the data, but can not guarantee the relevance of the data. At this point, we can use foreign keys. The figure shows an example of this method.

Thank you for reading this article carefully. I hope the article "how to optimize the database" shared by the editor will be helpful to everyone. At the same time, I also hope that you will support and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

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