手册SQL并发的相关内容

阿里云文档 2025-09-19

如何创建SelectDB集群

云数据库 SelectDB 版通过集群粒度实现算力隔离，多个集群可以分别用于不同的工作负载（例如读写数据），以满足各个业务的不同性能规模和使用时长需求。本文介绍如何在云数据库 SelectDB 版实例中新建集群。

阿里云文档 2025-08-18

SelectDB SQL手册

云数据库 SelectDB 版兼容标准的SQL语法。您可以通过标准的SQL语句访问云数据库 SelectDB 版，同时云数据库 SelectDB 版提供了丰富的数据类型和内置函数。SQL语法，请参见SelectDB SQL手册。云数据库 SelectDB 版通过标准的SQL语句访问云数据库 Sele...

阿里云文档 2024-09-10

HTTP API SQL接口开发手册

本文介绍时序引擎提供的基于HTTP协议的通用SQL接口的定义和用法。

阿里云文档 2022-12-07

什么是SQL手册公用表表达式及示例

AnalyticDB PostgreSQL版7.0版本增强了公用表表达式（Common Table Expression，简称CTE）功能，支持对CTE语句指定MATERIALIZED或NOT MATERIALIZED，可以更好地控制执行计划，能够有效提升SQL性能。

文章 2018-10-02 来自：开发者社区

PostgreSQL 10.1 手册_部分 II. SQL 语言_第 13 章并发控制_13.4. 应用级别的数据完整性检查

13.4. 应用级别的数据完整性检查 13.4.1. 用可序列化事务来强制一致性 13.4.2. 使用显式锁定强制一致性对于使用读已提交事务的数据完整性强制业务规则非常困难，因为对每一个语句数据视图都在变化，并且如果一个写冲突发生即使一个单一语句也不能把它自己限制到该语句的快照。虽然一个可重复读事务在其执行期间有一个稳定的数据视图，在使用MVCC快照进行数据一致性检查时也有一个小问题...

文章 2018-10-02 来自：开发者社区

PostgreSQL 10.1 手册_部分 II. SQL 语言_第 13 章并发控制_13.3. 显式锁定

13.3. 显式锁定 13.3.1. 表级锁 13.3.2. 行级锁 13.3.3. 页级锁 13.3.4. 死锁 13.3.5. 咨询锁 PostgreSQL提供了多种锁模式用于控制对表中数据的并发访问。这些模式可以用于在MVCC无法给出期望行为的情境中由应用控制的锁。同样，大多数PostgreSQL命令会自动要求恰当的锁以保证被引用的表在命令的执行过程中不会以一种不兼容的方式删...

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