What mysql engines are there?

mysql engines include InnoDB, MyISAM, Memory, Archive and CSV, etc. Detailed introduction: 1. InnoDB is the default storage engine of MySQL. It provides transaction support and row-level locking. The InnoDB engine uses multi-version concurrency control technology to achieve high-concurrency read and write operations. It also supports foreign key constraints and crashes. Functions such as recovery and automatic growth of columns; 2. MyISAM is another common storage engine of MySQL. It does not support transactions, row-level locking, etc.

MySQL is a commonly used relational database management system that supports a variety of different storage engines. The storage engine is the component in MySQL that handles data storage and retrieval. Different storage engines have different characteristics and applicable scenarios. Below I will introduce several common storage engines in MySQL.

1. InnoDB:

InnoDB is the default storage engine of MySQL, which provides transaction support and row-level locking. The InnoDB engine uses multi-version concurrency control (MVCC) technology to achieve highly concurrent read and write operations. It also supports features such as foreign key constraints, crash recovery, and auto-grow columns. InnoDB is suitable for application scenarios that require transaction support and high concurrent reading and writing, such as e-commerce, online payment, etc.

2. MyISAM:

MyISAM is another common storage engine of MySQL. It does not support transactions and row-level locking. The MyISAM engine uses table-level locking, which has good performance for read operations, but has poor performance when there are many concurrent write operations. The MyISAM engine does not support foreign key constraints and crash recovery, but it has smaller storage space and faster indexing speed. MyISAM is suitable for application scenarios with more read operations and fewer write operations, such as blogs and news websites.

3. Memory:

Memory (also called Heap) storage engine stores data in memory and has fast read and write speeds. The Memory engine does not support transactions and persistent storage. When the MySQL service is restarted, data will be lost. The Memory engine is suitable for scenarios that require fast reading and writing, such as temporary tables, caches, and caches.

4. Archive:

Archive storage engine is used to store large amounts of historical data. It uses a highly compressed data format that can significantly reduce storage space. The Archive engine does not support indexing and transactions, but has faster insertion and compression speeds. The Archive engine is suitable for data storage that only requires occasional queries, such as log archiving, backup, etc.

5. CSV:

The CSV storage engine stores data in text files in comma-delimited format and is suitable for importing and exporting data. The CSV engine does not support indexing and transactions, but has better readability and ease of use. The CSV engine is suitable for scenarios where data needs to be exchanged with other applications.

In addition to the common storage engines mentioned above, MySQL also supports other storage engines, such as Blackhole, Federated, NDB, etc. These storage engines have their own characteristics and applicable scenarios, and the appropriate storage engine can be selected according to specific needs.

It should be noted that different storage engines have different functions and performances. Choosing a suitable storage engine should be evaluated based on specific application requirements. When choosing a storage engine, you need to consider factors such as transaction support, concurrency performance, data integrity, storage space, index speed, etc., as well as comprehensive considerations based on specific application scenarios.

The above are several common storage engines and their characteristics in MySQL. I hope they will be helpful to you. If you have any further questions please feel free to let me know.

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