When it comes to distributed databases, whether they are centralized databases like Etcd/Zookeeper or decentralized databases like Ethereum blockchain, there are two keywords that cannot be avoided: “consistency” and “consensus”. This article is the notes recorded by me when learning “consistency” and “consensus” and related theoretical knowledge, which can help us understand the difference between Etcd/Zookeeper/Consul/MySQL/PostgreSQL/DynamoDB/Cassandra/MongoDB/CockroachDB/ TiDB, etc., understand the advantages and limitations of each database, understand the meaning of database isolation level and how it should be set, and enable us to choose the applicable database in various application scenarios.
NET 6 and SQL Server development environment into a Docker container using Visual Studio Code’s Remote Development today. Although it went smoothly with the documentation, the problem arose after the project was versioned. I think the point of this article is that in today’s containerized, cross-platform era, line breaks actually have to be confronted, or else you’ll be at a loss for what to do. Experience the feeling of developing
Timescale has released a new State of PostgreSQL Survey 2022, which ran from June 6 to June 30, 2022. The survey, which ran from June 6 to June 30, 2022, received 992 responses from developers around the world, and the State of PostgreSQL Survey provides some key insights into PostgreSQL functionality and the broader PostgreSQL community. The first version of the report released in 2019 collected feedback from more than 500 developers, and the second version of the report in 2021 also sampled nearly 500 participants.
1. The Cause I am a “DevOps engineer”, so I always get asked: “What is DevOps?” This question seems very basic, so basic that many people don’t bother to answer. But in fact, calm down for a second and ask yourself “What is DevOps?” and every DevOps engineer probably knows “what is DevOps”, but they give different answers. So how would I answer this? Let’s talk about it below. 2. Memories I first saw the term DevOps around the fall of 2016.
For every Linux learner, understanding the directory structure of the Linux file system is a crucial step to learn Linux well. An in-depth understanding of the standards of the Linux file directory structure and the detailed functions of each directory is very important for us to use the Linux system well. The file system’s are used to organize and arrange file access, so it is visible, in Linux, we can view its structure through tools such as ls, in Linux, we see a tree structure; for example, the operating system is installed in a file system, he behaves as a tree structure starting from /.
For optimizing front-end loading performance, many people use http-cache, asynchronous loading, 304 status codes, file compression, CDN and other methods to solve the problem. In fact, in addition to these methods, there is one more powerful than all of them, and that is Service Worker. We can use Google Chrome team’s Workbox to implement Service Worker for rapid development. Registering a Service Worker Add the following to the page to
We have always believed that coroutines are a more efficient way to work concurrently than multithreading, and that they are completely controlled by the program itself, i.e., executed in the user state. coroutines avoid the context switching that occurs with thread switching, resulting in significant performance gains. But in fact, coroutines are much more complex than most people think. Because of their “user state” nature, task scheduling is in the
ECDSA ECDSA is the famous elliptic curve signature algorithm that provides security comparable to RSA3072 with a 256-bit private key size. The Golang standard library provides crypto/ecdsa, which provides the ability to sign, verify and generate public and private keys. However, in general we do not use Go to generate and save public-private keys, but rather OpenSSL to do so. For the OpenSSL command to generate public-private keys, we generally use prime256v1 or secp384r1, the two recommended curve parameters, here we choose prime256v1.
Golang 1.19 was just released and I couldn’t wait to update to the latest version. My OS is Win10 and when I installed it there was an exception. 1 The installer has encountered an unexpected errorinstalling this package. This may indicate a problem withthis package. The error code is 2502. 1 The installer has encountered an unexpected errorinstalling this package. This may indicate a problem withthis package.