在 MySQL 的面试中有一类经典的面试题。比如：如何给正在线上运行的表执行 DDL 语句？ 回答这个问题，首先我们需要明确，执行 DDL 语句的时候，MySQL 会干什么？ 在 MySQL 5.6 之前，执行 DDL 语句的时候，会给表添加写锁，会阻塞该表其他所有的读写操作。这对 ...

Humans are far closer to meerkats and beavers for levels of exclusive mating than we are to most of our primate cousins, according to a new University of Cambridge study that includes a table ranking ...

Abstract: This paper investigates and compares the performance of relational databases (MySQL and PostgreSQL) and key-value databases (Memcached and Redis) under various test loads. The study utilizes ...

Which Premier League teams are overachieving and underachieving this season? And will Arsenal be caught? This week's Between the Lines reveals how the Premier League table should look, according to ...

Introduction: In countries with unrestricted access to healthcare, such as Japan, patients may initiate a drug at a clinic or hospital and then may visit another hospital when outcome events occur.

A top Social Security Administration official turned whistleblower says members of the Trump administration’s Department of Government Efficiency (DOGE) uploaded hundreds of millions of Social ...

A Social Security Administration (SSA) official alleged in a whistleblower disclosure that DOGE officials created “a live copy of the country’s Social Security information in a cloud environment that ...

Background: Postmarketing pharmacovigilance data have raised concerns regarding the potential cognitive effects associated with finasteride administration. However, existing epidemiological evidence ...

This restriction makes sense only if the source and destination databases are the same, which could lead to overwriting data in-place. However, copying between different databases on the same instance ...