MySQL 8.0新增特性详解

不客气地说，升级到MySQL 8 .0是一个大工程。
In addition to major work on data dictionary and storage architecture, we also invest heavily in transaction processing, security, performance optimization, and feature expansion.先说最重要的：数据字典和存储架构的升级。
例如，使用InnoDB引擎存储事务性数据字典，替换原来的非事务性元数据文件。
这样就保证了字典数据操作的原子性。
我们去年从事的一个项目由于这个功能解决了很多问题。

还有一点是InnoDB存储引擎的优化比如自增长列的持久化也很重要。
该特性解决了实例重启后热量不连续自增的问题。
大约 3 ,000 个项目将受益于这些改进。
另一个关键细节是 Memcached 插件得到了增强，支持多键搜索和范围查询。
这是缓存性能的真正改进。

起初我以为这些安全更新只是锦上添花，但后来我意识到出了问题。
更改默认身份验证插件和加强密码策略可以直接提高数据库安全性，尤其是在处理敏感数据时。
等等，还有一件事。
权限表是事务性的。
这些变化使得权限管理更加稳定可靠。

在性能和资源管理方面，资源组控制和死锁检测优化在处理高并发场景时非常有用。
内部临时表优化默认使用 TempTable 引擎而不是 MEMORY。
这一变化也明显提高了存储效率。

This part simplifies complex analytical queries through SQL function enhancements, window functions, and common table expressions (CTEs), and enhances JSON data types to make data processing more flexible. Optimizations of regular expressions and locking options have resulted in significant improvements in concurrency control.
In terms of backup and replication, backup locking and replication format optimization are both documents aimed at ensuring data consistency and efficiency.
In terms of logging and monitoring, configuring error logs and monitoring index caches are very practical for monitoring database operations and maintenance.
Character set and default value changed from latin1 to utf8 mb4 .此更改显着改进了 Unicode 字符支持。

Finally, the dedicated management port for connection management has been very thoughtfully designed for scenarios that require independent management of databases.
In summary, these new features in MySQL 8 .0 are not only technical upgrades, but also comprehensive improvements to database stability and security. I think it's worth a try, but you should still be careful before using it.例如，更改默认字符集可能会影响某些较旧的应用程序。

MySQL8.0对比MySQL5.7的性能提升及优化

Oops, we need to talk about MySQL8 .0 and MySQL5 .7 . Truth be told, since I've been involved in Q&A forums for ten years and saw the release of MySQL 8 .0, the changes are quite remarkable. I must first talk about the improved JSON processing capabilities, which is a highlight. In 2 01 5 , as soon as MySQL 8 .0 came out, direct searching, sorting, and filtering of JSON data was supported, which was much more efficient than version 5 .7 .
Let's talk about the index of JSON expressions. This was only introduced in 2 01 6 , making querying JSON data faster. In addition, the multi-threaded architecture of MySQL 8 .0, launched in 2 01 7 , can better utilize multi-core processors, and the concurrent processing capabilities directly increase.
In terms of storage engines, MySQL 8 .0 supports many more, such as InnoDB, MyISAM, NDB, etc. This is much richer than that of 5 .7 and meets the needs of different application scenarios.
In terms of data types, MySQL 8 .0 has added new types such as YEAR. Once launched in 2 01 8 , the flexibility and availability of the database were improved.
Regarding security, MySQL 8 .0's password verification mechanism is more secure, and the encryption algorithm and SSL/TLS support are also stronger. Once updated in 2 01 9 , the security of data transmission will be guaranteed.
In terms of configuration optimization, such as adjusting cache size, when MySQL 8 .0 first came out in 2 01 6 , it was recommended to set innodb_buffer_pool_size to 7 0% to 8 0% of system memory, thus improving database cache utilization and performance.
2 01 7 年优化了注册表设置和表空间配置，提高了数据库稳定性和性能。

As for backup configuration, the mysqlpump backup tool provided by MySQL8 .0 will be more capable of large-scale data processing when it comes online in 2 01 8 .
Overall, MySQL 8 .0 is indeed much better than MySQL 5 .7 in terms of performance improvement and optimization, with more processing power and security, richer features, and more flexible configuration options. At the time I didn't understand why this change was so h3.

MySQL8.0对比MySQL5.7的性能提升及优化

MySQL 8 .0升级，JSON操作快速，多核更高效，新类型更灵活。
缓存调整到7 0-8 0%，优化日志，处理表空间大数据。
安全升级，使用caching_sha2 _password和SSL/TLS加密。
备份效率更高，mysqlpump工具强大。
你自己掂量一下吧。