MySQL8.0新特性
时间: 2023-09-22 08:09:52 浏览: 139
MySQL 8.0有许多新特性,以下是其中一些重要的特性:
1. 支持窗口函数:MySQL 8.0引入了窗口函数,使得在查询中可以使用类似于分区、排序、聚合等操作。这使得编写复杂的查询变得更加简单和高效。
2. JSON 支持:MySQL 8.0增加了对JSON数据类型的支持,允许存储、查询和操作JSON数据。这对于处理半结构化数据非常有用。
3. CTE(公共表达式):CTE允许在查询中定义临时的命名结果集,使得查询更加可读和模块化。
4. 自增列改进:MySQL 8.0引入了自增列的新属性,包括支持自定义自增步长、开始值和循环。
5. 更好的性能和可伸缩性:MySQL 8.0通过优化查询执行计划和锁机制,提供了更好的性能和可伸缩性。
6. 全文索引改进:MySQL 8.0改进了全文索引功能,提供了更好的搜索性能和更丰富的搜索功能。
7. InnoDB引擎改进:MySQL 8.0对InnoDB存储引擎进行了多项改进,包括支持更大的页大小、在线DDL操作、多版本并发控制等。
这只是MySQL 8.0中的一些新特性,还有其他许多改进和功能增加。你可以查阅MySQL官方文档来获取更详细的信息。
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mysql8.0 新特性
1. Window functions: MySQL 8.0 now supports window functions, which allows users to perform complex analytical queries with ease.
2. Common Table Expressions (CTEs): CTEs are temporary result sets that can be used within a single SQL statement. This feature makes it easier to write complex queries and improves code readability.
3. Recursive Common Table Expressions (RCTEs): RCTEs are a special type of CTE that allows users to write recursive queries. This feature is useful for queries that involve hierarchical data.
4. JSON enhancements: MySQL 8.0 includes several enhancements to its JSON support, including better performance and improved functionality.
5. Invisible indexes: This feature allows users to mark an index as "invisible," which means that it will not be used by the query optimizer. This can be useful for testing the impact of removing an index without actually removing it.
6. Instant ADD COLUMN: MySQL 8.0 includes a new feature that allows users to add a new column to a table without copying the entire table. This can be useful for large tables with many columns.
7. Roles: MySQL 8.0 introduces the concept of roles, which allows users to define sets of privileges that can be assigned to multiple users.
8. Improved performance: MySQL 8.0 includes several performance improvements, including better support for multi-threaded queries and faster data loading.
9. Improved security: MySQL 8.0 includes several security enhancements, including improved password management and support for encrypted connections.
10. Improved replication: MySQL 8.0 includes several improvements to its replication capabilities, including support for multiple replication channels and better conflict detection and resolution.
mysql8.0新特性
1. 支持Window Functions:可以对分组结果进行分析和排序,实现更灵活的数据分析。
2. 支持Common Table Expressions(CTE):可以在查询中创建临时表格,让复杂的查询更加简单易懂。
3. 支持Invisible Indexes:创建一个不可见的索引,可以用于测试和优化而不会影响生产环境。
4. 支持JSON类型:可以将JSON数据存储在数据库中,并使用内置的JSON函数进行查询和操作。
5. 支持全文本搜索:可以在表格中进行全文本搜索,并使用内置的全文本搜索函数进行高效的查询。
6. 支持更好的性能和可扩展性:在多核CPU和高并发情况下,MySQL 8.0的性能和可扩展性得到了显著的提升。
7. 支持更好的安全性:MySQL 8.0引入了更多的安全特性,包括密码策略、加密连接、访问控制等,保障了数据库的安全性。
8. 支持更好的管理工具:MySQL 8.0提供了更好的管理工具,包括MySQL Shell、MySQL Workbench等,使得数据库的管理更加简单易用。
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