数据库定义ddl 的相关内容

阿里云文档 2026-01-05

使用EXPLAIN DDL预览DDL操作的执行细节-云原生数据库 PolarDB-阿里云

在MySQL生态中，DDL操作复杂且耗时，稍有不慎，就会影响正常业务。PolarDB MySQL版新增EXPLAIN DDL功能。您可以在执行DDL前了解执行细节，从而正确评估DDL操作对当前业务的影响。

阿里云文档 2025-09-16

Online DDL（rds_online_ddl）

在RDS PostgreSQL中进行某些数据定义语言（DDL）操作时，例如将INT类型变更为BIGINT，原生的ALTER COLUMN TYPE操作会因二进制不兼容而重写整个表，期间会长时间锁定表，中断业务读写。为了解决这一问题，RDS PostgreSQL提供了rds_online_ddl插件，该插件支持在线修改列类型，从而在不影响业务连续性的前提下完成表结构变更。

阿里云文档 2025-07-23

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。

阿里云文档 2025-06-25

如何使用逻辑复制来复制数据定义命令(DDL)

PolarDB PostgreSQL版（兼容Oracle）支持使用逻辑复制来复制数据定义命令 (DDL)。

文章 2024-06-21 来自：开发者社区

零基础学习数据库SQL语句之定义数据库对象的DDL语句

DDL语句 DDL Date Definition Language 数据定义语言，用来定义数据库对象（数据库，表，字段）基本操作数据库操作查询所有数据库 SHOW DATEBASES ...

文章 2024-04-16 来自：开发者社区

关系性数据库定义语言（DDL）

关系型数据库定义语言（DDL，Data Definition Language）是SQL（结构化查询语言）的一个子集，用于定义或修改数据库结构。DDL的主要功能包括定义或更改表结构、定义或更改索引、定义或更改触发器等。DDL命令在数据库中创建、删除或修改数据库对象，如表、视图、索引、数据类型、存储过...

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更新时间 2024-06-22 11:28:40

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