Java面试mysql 的相关内容

Java 最常见的面试题：mysql 索引是怎么实现的？

MySQL的索引实现主要依赖于存储引擎。不同的存储引擎，如MyISAM和InnoDB，实现索引的方式也有所不同。 MyISAM引擎：MyISAM引擎使用B-Tree作为索引结构。叶节点的data域存放的是数据记录的唯一标识符（通常是自增ID）。MyISAM表数据文件和索引文件是分离的，索引文件仅保存...

Java 最常见的面试题：mysql 的内连接、左连接、右连接有什么区别？

MySQL的内连接（inner join）、左连接（left join）和右连接（right join）都是用于连接两个或多个表的连接方式，但它们的区别主要在于返回的数据和处理的顺序。1. 内连接：内连接只返回两个表中匹配的行，即只返回两个表中都存在的数据。内连接使用的是...

Java面试疑难点解析 - 面试技巧及语言基础

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Java 最常见的面试题：一张自增表里面总共有 7 条数据，删除了最后 2 条数据，重启 mysql 数据库，又插入了一条数据，此时 id 是几？

表类型如果是 MyISAM ，那 id 就是 18。表类型如果是 InnoDB，那 id 就是 15。 InnoDB 表只会把自增主键的最大 id 记录在内存中，所以重启之后会导致最大 id 丢失。

【java常见的面试题】简述MySQL引擎InnoDB和MyISAM的区别？

InnoDB：是MySQL默认的事务型存储引擎，只有当需要它不支持的特性时，才会考虑使用其它的存储引擎。实现了四个标准的隔离级别，其中默认为可重复读，在可重复读的隔离级别下，通过MVCC（多版本并发控制协议）+ 间隙锁（Next-key Locking&#...

【java常见的面试题】Redis和Mysql如何保证数据⼀致?

先更新Mysql，再更新Redis，如果更新Redis失败，可能仍然不⼀致先删除Redis缓存数据，再更新Mysql，再次查询的时候在将数据添加到缓存中这种⽅案能解决1 ⽅案的问题，但是在⾼并发下性能较低，⽽且仍然会出现数据不⼀致的问题，⽐如线程1删除了 Redis缓存数据&#x...

【java常见的面试题】mysql的性能优化

从设计方面选择合适的存储引擎 , 合适的字段类型 , 遵循范式(反范式设计) 存储引擎 :不需要事务, 不需要外键读写较多的的使用MyIsam需要事务, 需要外键的使用InnoDB 合适的字段类型 , 例如 :定长字符串用char , 不定长用varchr状态, 性别等有限数量值的用tinyint...

【java常见的面试题】 MYSQL支持的存储引擎有哪些, 有什么区别 ?

MYSQL存储引擎有很多, 常用的就二种 : MyISAM和InnerDB , 者两种存储引擎的区别 ; MyISAM支持256TB的数据存储 , InnerDB只支持64TB的数据存储MyISAM 不支持事务 , InnerDB支持事务MyISAM 不支持外键 , InnerDB支持外键

Java面试01：mysql数据库高频面试汇总

文章目录1.请你谈谈 MySQL 事务隔离级别，MySQL 的默认隔离级别是什么？2、可重复读解决了哪些问题？3、对 SQL 慢查询会考虑哪些优化？4、MySQL 为什么 InnoDB 是默认引擎？5、MySQL 索引底层结构为什么使用 B+树？6、B+ 树的叶子节点链表是单向还是双向ÿ...

java初中级面试题(SSM+Mysql+微服务(SpringCloud+Dubbo)+消息队列(RocketMQ)+缓存(Redis+MongoDB)+设计模式+搜索引擎(ES)+JVM

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