mysql modify storage

With the advent of the Internet and the digital age, the importance of data has been paid more and more attention to, especially within the enterprise, data storage and management are only completely indispensable. Due to the huge amount of data, the powerful data storage and management functions of relational databases play a particularly important role, and the most widely used one is MySQL database. MySQL is a lightweight, open source, customizable and scalable relational database management system. It has many useful and powerful features, including a rich storage engine, security, multi-language support, and more. This article will introduce how to modify storage in MySQL.

MySQL Storage Engine

MySQL provides multiple storage engines to meet different needs. Various storage engines are optimized for how specific types of data are stored and retrieved. MySQL's default storage engine is InnoDB, which is a storage engine with ACID transaction support, making it one of the most commonly used storage engines for MySQL. In addition, storage engines such as MyISAM and MEMORY are also widely used.

Modify the storage engine in MySQL

In MySQL, you can modify the storage engine of a table very simply. For example, here's how to switch a MyISAM table to InnoDB.

1. Log in to the MySQL database

2. Select the database to change the storage engine

3. Run the following command:

ALTER TABLE table_name ENGINE=InnoDB;

This will Storage engine changed to InnoDB. In other words, you have successfully switched tables from MyISAM to InnoDB. However, please note that before performing this operation, you should consider the characteristics of the original table's storage engine and the new storage engine. As shown in the following table:

Therefore, after changing Before choosing a storage engine for a table, weigh the pros and cons in order to choose the most appropriate one.

Modify the character set of a table in MySQL

The MySQL database uses character sets to encode data into a computer-readable binary form. In MySQL, you can change the data encoding format by modifying the character set of an existing table. For example, here's how to change the character set of a table from utf8 to utf8mb4:

1. Log in to the MySQL database

2. Select the database where you want to change the character set

3. Run the following command:

ALTER TABLE table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

'utf8mb4' here refers to a wider Unicode encoding range than the standard utf8 encoding range. It supports all characters in UTF-8, including Emoji.

Now you have successfully changed the table's character set from utf8 to utf8mb4. Note that before changing a table's character set to a new character set, be sure to back up your data, as the change may corrupt the table's indexes and data.

Modify the default storage engine of a table in MySQL

Sometimes, you may want to use your favorite default storage engine when creating a table instead of the MySQL default storage engine. The following is how to modify the default storage engine of a table in MySQL:

1. Log in to the MySQL database

2. Select the database where you want to change the default storage engine

3. In MySQL In the configuration file, find the [mysqld] section and add the following line:

default_storage_engine=MyISAM

This will change the default storage engine of MySQL to MyISAM. Likewise, please note that before changing MySQL's default storage engine, you should consider the advantages and disadvantages of the original default storage engine and the new storage engine.

Conclusion

MySQL is a powerful and easy-to-use database management system that can easily modify the storage engine, character set and default storage engine of the table. When making these modifications, always make sure to back up all data and carefully consider the potential impact of each change. Without careful consideration of these issues, changing the storage engine and character set or the default storage engine can result in data loss or application failure. At the same time, be aware that because MySQL has different storage engines, each storage engine has different disadvantages and advantages. Therefore, please choose the storage engine that best suits you based on your application requirements and needs, and use the powerful functions of MySQL to support your business while ensuring data integrity and stability.

The above is the detailed content of mysql modify storage. For more information, please follow other related articles on the PHP Chinese website!