数据库字段定义的相关内容

阿里云文档 2025-06-30

删除不同约束下字段的不兼容场景

本文为您介绍 MySQL 数据库和 OceanBase 数据库 MySQL 租户对于删除不同约束下字段的不兼容场景。

阿里云文档 2025-06-30

修改没有约束的列的字段长度的不兼容场景(MySQL)

本文为您介绍 MySQL 数据库和 OceanBase 数据库 MySQL 租户对于修改没有约束的列的字段长度的不兼容场景。

阿里云文档 2025-04-18

敏感字段加密（rds_encdb）

RDS PostgreSQL提供了rds_encdb插件，用于对查询结果集的敏感列进行加密。同时，通过对数据库账户权限进行设置，相关账户在访问敏感列信息时，仅能获得密文格式的查询结果。

阿里云文档 2025-03-14

在MySQL生态中，修改字段的类型需要使用COPY算法对全表数据进行重建，且重建过程中目标表只能查询数据，不能并发的写入数据。更糟糕的是，COPY算法采用单线程进行全表重建，其效率较低。因此，修改字段类型操作一直是MySQL生态下的痛点问题。为了解决这一问题，PolarDB MySQL版支持秒级修改字段（Instant Modify Column）功能，在修改字段类型时，只需变更表定义信息，无需修...

阿里云文档 2024-11-29

RDS PostgreSQL 秒级加字段DDL最佳实践

本文介绍如何在RDS PostgreSQL中通过设置锁等待超时和自动化重试DDL操作，有效解决在执行添加字段的DDL操作时所遇到的锁阻塞问题，从而减少对业务的影响。

问答 2024-08-07 来自：开发者社区

在OceanBase数据库中，ocp在配置告警通道时选择手机号，这个接收人字段是怎么定义的？

在OceanBase数据库中，ocp在配置告警通道时选择手机号，接收人字段一直报错这个接收人字段是怎么定义的？

问答 2024-02-06 来自：开发者社区

Flink CDC里我mysql 数据库有个表它的字段定义为date类型，数值变化什么原因？

Flink CDC里我mysql 数据库有个表它的字段定义为date类型，比如在数据库中存储的值为2024-02-01，用flink cdc读取binlog这个字段的值变成了数字19754，是什么原因，该怎么解决？

问答 2021-10-02 来自：开发者社区

数据库中的字段为什么要求定义为not null？

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更新时间 2024-08-08 15:07:32

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