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19.1.14. CAPCAP原则又称CAP定理，指的是在一个分布式系统中，Consistency （-致性）、Availability （可用性）、Partition tolerance （分区容错性），三者不可得兼。一致性（C）࿱...

JAVA面试——数据库（三）

19.1.5. 数据库锁19.1.8.1. 行级锁行级锁是一种排他锁，防止其他事务修改此行；在使用以下语句时，Oracle会自动应用行级锁：1. INSERT、UPDATE、DELETE. SELECT... FOR UPDATE [OF columns] [WAIT ...

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19.1.3.数据库三范式范式是具有最小冗余的表结构。3范式具体如下：19.1.3.1.第一范式（1st NF -列都是不可再分）第一范式的目标是确保每列的原子性:如果每列都是不可再分的最小数据单元（也称为最小的原子单元），则满足第一范式（1NF） 19.1.3.2.第二范式...

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java面试-数据库三大范式

第一范式第一范式（1NF）要求数据库表的每一列都是不可分割的基本数据项，同一列中不能有多个值。若某一列有多个值，可以将该列单独拆分成一个实体，新实体和原实体间是一对多的关系。在任何一个关系数据库中，第一范式（1NF）是对关系模式的基本要求，不满足第一范式（1NF）的数据库就不是关系数据库。第...

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