Process multiple business modules at the same time. Multiple business modules may need to transfer data to each other or need synchronous control. Two entities need to communicate with each other and must have resources that can be shared. Files on disk: -- > IO processing is slow and out of sync.
Application scenario of process co ...
Posted by generic88 on Fri, 04 Mar 2022 14:34:27 +0100
paging1. Background:Background 1: there are too many records returned by query, which is very inconvenient to view. How can we realize paging query?Background 2: there are four data items in the table. What if you only want to display the second and third data items?2. Implementation rulesPaging principle
The so-called pagination display refer ...
Posted by gdure on Fri, 04 Mar 2022 04:36:08 +0100
Author: fabricated belief Original text: https://segmentfault.com/a/1190000013803247
This paper introduces several main new features of 8.0 in relational database.
You may already know that MySQL has provided NoSQL storage function since version 5.7, and some improvements have been made in 8.0. However, since this function is rarely used in p ...
Posted by php.ajax.coder on Fri, 04 Mar 2022 00:21:33 +0100
1, Quick start
1. Check the health status of the cluster
Note: v is used to require the header to be returned in the result
Status value description
Green - everything is good (cluster is fully functional) Yellow - all data is available but some replicas are not yet alloca ...
Posted by R0CKY on Fri, 04 Mar 2022 00:05:26 +0100
The goal is to let cloud data warehouse users and developers experience the main process of building cloud native data warehouse based on AnalyticDB MySQL and DMS through simple steps. The scene will be through the links of instance opening, structure and data initialization, report development, report visualization and so o ...
Posted by todd2006 on Thu, 03 Mar 2022 21:20:06 +0100
First, let's talk about my version information
Operating system MacOS Big Bur 11.2.2
Note: I installed it through the official dmg package, not through homebrew. If it is a problem in homebrew installation, it can also be used as a reference.
Current date: April 21, 2021
If you want to directly test the results, you can ju ...
Posted by Vasudhevan on Thu, 03 Mar 2022 19:34:48 +0100
4. DQL query data (most important)
Data Query Language
All query operations use it to SELECT
It can do simple query and complex query~
The core language and the most important statement in the database
Most frequently used statements
SELECT statement syntax
[ALL | DISTINCT | DISTINCTROW ]
Posted by ToonMariner on Thu, 03 Mar 2022 18:18:55 +0100
APIJSAON (I: Introduction)backgroundDue to various wonderful abbreviations, chaotic naming, outdated documents, out of sync with interfaces, unstable or arbitrary changes of data types, hundreds or even thousands of chaotic status codes, all kinds of wrangling between the front end and the back end, cumbersome whole development process, long de ...
Posted by jannoy on Thu, 03 Mar 2022 12:03:23 +0100