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This article mainly introduces the methods of database optimization, the article is very detailed, has a certain reference value, interested friends must read it!

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

Several methods of database optimization:

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 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 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 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 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 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 above are all the contents of the database optimization methods, thank you for your reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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