postgresql SQL 的相关内容

文章 2022-02-15 来自：开发者社区

PostgreSQL SQL OUTLINE插件sr_plan (保存、篡改、固定执行计划)

标签 PostgreSQL , sql plan outline , 执行计划篡改 , query rewrite , sr_plan , pg plan hint 背景功能较为强大的数据库，通常都有query rewrite的功能，比如JOIN时提升或下推条件，调整JOIN顺序等。例如 create table a(id int, info text); create ta...

文章 2022-02-15 来自：开发者社区

PostgreSQL pgbench SQL RT 与事务RT 浅析

背景使用pgbench测试数据库性能时，在输出的报告中，可以输出事务的平均RT，以及单条SQL的平均RT。那么这两个有什么分别呢？每行代表一个线程，被填充了颜色的部分表示从客户端发起SQL到SQL返回的时间窗口，没有填充颜色的部分表示线程的空闲时间。如何统计事务平均RT : 执行的事务数/总的测试时长如何统计SQL 平均RT : 每条SQL的执行时长累加/总的SQL执行次数从计算.....

文章 2022-02-15 来自：开发者社区

《卸甲笔记》-PostgreSQL和Oracle的SQL差异分析之五：函数的差异(七)

PostgreSQL是世界上功能最强大的开源数据库，在国内得到了越来越多机构和开发者的青睐和应用。随着PostgreSQL的应用越来越广泛，Oracle向PostgreSQL数据库的数据迁移需求也越来越多。数据库之间数据迁移的时候，首先是迁移数据，然后就是SQL、存储过程、序列等程序中不同的数据库中数据的使用方式的转换。下面根据自己的理解和测试，写了一些SQL以及数据库对象转换方面的文章，不足之....

文章 2022-02-15 来自：开发者社区

《卸甲笔记》-PostgreSQL和Oracle的SQL差异分析之四：特殊字符和符号

文章 2022-02-15 来自：开发者社区

PostgreSQL Oracle 兼容性之 - PL/SQL record, table类型定义

背景 Oracle PL/SQL是非常强大的一门SQL编程语言，许多Oracle用户也使用它来处理一些要求延迟低且数据一致性或可靠性要求很高的业务逻辑。 PostgreSQL也有一门非常高级的内置SQL编程语言，plpgsql。与Oracle PL/SQL语法极其类似，但是还是有一些不一样的地方。 (PS：除了plpgsql，PostgreSQL还支持C，java，python，perl等...

文章 2022-02-15 来自：开发者社区

PostgreSQL Oracle 兼容性之 - PL/SQL FORALL, BULK COLLECT

Oracle PL/SQL 开发的童鞋，一定对O家的bulk批量处理的性能很是赞赏吧。但是PostgreSQL用户请不要垂涎，作为学院派和工业界的一颗璀璨明珠。开源数据库PostgreSQL，也有对应的批量处理策略哦，而且看起来性能完全不输Oracle。下面是一组LOOP和BULK的性能测试数据一起来耍耍吧，先看看Oracle怎么耍的。 Oracle PL/SQL FORAL...

问答 2022-02-15 来自：开发者社区

SQL Server同步至AnalyticDB PostgreSQL中支持同步的SQL操作是什么？

问答 2022-02-15 来自：开发者社区

RDS PostgreSQL同步至RDS MySQL中支持同步的SQL操作是什么？

问答 2022-02-15 来自：开发者社区

PostgreSQL同步至PolarDB O引擎中同步的SQL操作的说明是什么？

问答 2022-02-15 来自：开发者社区

PostgreSQL同步至PolarDB O引擎中支持同步的SQL操作是什么？

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