What mode is mysql implemented?

MySQL uses two main storage models: InnoDB and MyISAM. InnoDB supports transaction safety, row-level locks and foreign key constraints, and is suitable for applications that require data integrity and high concurrency; MyISAM has excellent performance and is suitable for scenarios where read-intensive operations and concurrency problems or transactions are not significant. Applications should choose the appropriate storage model based on specific needs.

MySQL storage model

MySQL uses the relational data model to manage data. The relational data model organizes data into a two-dimensional table, where each row represents an entity and each column represents an attribute of the entity.

MySQL implements the following two main storage modes:

1. InnoDB

• Default storage engine: In MySQL 8.0 and higher, InnoDB becomes the default storage engine.

• Features:

  • Transaction security: Supports ACID transactions to ensure data integrity.
  • Row-level lock: Only lock the affected rows to reduce conflicts of concurrent requests.
  • Foreign key constraints: Maintain the integrity of relationships between tables.
  • Supports foreign key constraints and triggers.
  • High concurrent processing capability: Optimized multi-threaded concurrent access.

2. MyISAM

• ##Historical storage engine: Before MySQL 8.0, MyISAM was Default storage engine.

• Features:

  • High performance: MyISAM performs well for read-intensive operations.
  • Table-level lock: You need to acquire a lock when accessing the entire table, which may cause concurrency problems.
  • Transactions and foreign key constraints are not supported: Data integrity is application dependent.
  • Foreign key constraints and triggers are not supported.
  • Not friendly to concurrent access: Performance will decrease when a large number of concurrent accesses occur.

Storage mode selection

• InnoDB is the best choice for applications that require transaction safety, high concurrency, and data integrity.
• MyISAM may be a better choice for applications that prioritize read performance and do not involve concurrency issues or transactions.

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