2026年2月3日，藤井正雄在psql中新增了转义符%i，用于显示连接服务器的热备状态。若服务器为热备模式，则显示为standby，反之则为primary。这一改进有助于数据库管理员快速识别数据库角色，提高工作效率。

© Laurenz Albe 2025 In a previous article, I recommended using bigint for sequence-generated primary keys (but I make an exception for lookup tables!). If you didn't heed that warning, you...

Unlock the secrets to reliable databases with primary and foreign keys! This beginner-friendly post uses engaging library metaphors and approachable SQL examples to show how keys keep your MySQL...

本文提出了一种基于EfficientNet的分层多粒度故障诊断模型，克服了核电系统中单一设备的局限性，能够有效分类不同电路和系统组件的故障，从而提升核电站的安全性。

A long time ago, I read in a medical book that One can learn about a system when things go wrong. So diseases are a good way to learn more about how the human body functions. That sentence stuck...

C# 12的Primary Constructor可以更简单地声明空类型，对于record和空的class和struct都适用。示例代码展示了如何使用Primary Constructor来声明类型。使用;可以简化空类型体。文章提供了反编译结果和参考链接。

主构造函数是在class或record的类声明中添加参数的方式。它可以用于初始化基类、成员字段或属性，以及简化依赖注入。派生类可以通过调用基类的主构造函数来初始化基类。主构造函数的参数是必须调用的构造函数的参数。

DigiCert旗下的数字证书品牌Thawte的根证书被吊销，导致部分软件无法正常加载。根证书已在Windows平台上吊销，苹果也更新了可信证书库。被吊销的证书为thawte Primary Root CA，签发时间为2006年，有效期至2036年。DigiCert和Thawte尚未公布吊销原因，可能是基础设施问题或私钥泄露。其他Thawte证书正常。

The Primary key is like the hero of a row, which has more beneficial features in the table while performing any task on the table. The DBA knows the importance of the primary key in the table...

TODO 看懂原有 primary/detail 模板的跳转逻辑 新建 snippet list fragment override fun onViewCreated(view: View, savedInstanceState: Bundle?) { val itemDetailFr...

Hey folks, This blog is straightforward but, at the same time, handy. At Percona, we know that the audience of our blogs is not limited to DBAs but includes a broader range of IT professionals,...

Turns out the question of which identifier to use as a Primary Key is complicated -- we're going to dive into some of the complexity and inherent trade-offs, and figure things out

Referential Integrity is a must when it comes to proper relational database design. The consistent usage of primary keys can help you ensure the best practices of RDBMS are adhered to. In this...

The MySQL InnoDB storage engine lives off primary keys: Records are stored physically in a B+-Tree, a balanced tree where the data pages are the leaves of the primary key B-Tree. That implies that...

I have spent a lot of time on the primary schools choosing for my child. It is really a good result that I have generated a viz to show the details about all the information I found. Thanks for...

题目 源地址： http://poj.org/problem?id=2562 理解 高精度的模拟加法进位，数组模拟之。 代码 #includ...