Category：Database
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Time：2021-10-22
Write in front Since the spring boot, a web project has become very simple, This article mainly explains how to use spring MVC to build a web project without using the automatic configuration of spring boot Web.xml can be discarded after servlet 3.0, so this article will not have any XML files, all in the […]
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Time：2021-10-22
background As the application becomes larger and larger, the amount of data becomes more and more. Neither the single database, single table nor single redis of MySQL database can meet the high concurrent read-write operations and the storage function of large amount of data. Therefore, we are familiar with itSub database and sub table。 Vertical […]
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Time：2021-10-22
In the series sharing of “domestic database hard core technology salon tdsql-a technology disclosure”, five Tencent cloud technology masters gave an in-depth interpretation of tdsql-a from the aspects of overall technical architecture, column storage and related execution optimization, cluster data interactive bus, distributed execution framework and vector execution engine. In the last issue of this […]
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Time：2021-10-22
Have you heard that Huawei cloud 11.11 cloud Carnival offers unprecedented discounts. Many enterprises rush to buy orders at that speed. It really doesn’t talk about martial ethics. Do it when you should. The activity is ready to end. If you haven’t rush to buy, you should hurry up, otherwise you really regret it!!! In […]
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Time：2021-10-22
Senior Database Kernel R & D of Gao riyao Graduated from Huazhong University of science and technology, likes to study the mainstream database architecture and source code, and has long been engaged in the research and development of distributed database kernel. Once participated in the development of cirrodata kernel of distributed MPP database (Dongfang Guoxin), […]
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Time：2021-10-22
Use redistemplate to operate bitmap to complete daily check-in There are only two statuses: Yes and no (1, 0). A month can last up to 31 days. The four byte32 bits can just accommodate the data volume of a month. Each bit 0 and 1 indicates whether to check in or not. Therefore, using 4 […]
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Time：2021-10-22
More welcome to the blog:https://imjianjian.github.io Mongodb version: 3.4 1、 Download mongodb Official website download address:https://www.mongodb.com/downl… 2、 Configure mongodb The installation version and decompression version are available. The directory structure after installation is the same, as follows: /mongodb /bin GNU-AGPL-3.0 MPL-2 README THIRD-PARTY-NOTICES Configure the bin directory into the system variable pathWrite mongodb configuration file (mongodb. […]
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Time：2021-10-22
Ora-12541: TNS: no listener Error when connecting to database:Error: ora-12541: TNS: no listener Interpretation:The listening service of the database is not started normally. Idea:1.Win+R——>services.msc——>CheckOracleOraDB12Home1TNSListener、OracleServiceORCLWhether the service is started. If not, click start and modify it to self start.2. If the problem still cannot be solved after startup, stop the above services first. Find the listening […]
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Time：2021-10-22
Source of this articleMySQL ranking function implementationReprint, please indicate the source Now there is a need to rank all students’ scores and list their ranking. Just seeing this demand, I was a little confused and had no ideas at all. Why wouldn’t I do it if it was more difficult? Go online to query information, […]
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Time：2021-10-21
preface The JPA used by the company in the past is very convenient. For new projects, I choose to use mybatis. SQL is written in XML files. Although the basic methods are generated by tools, once a field is added to the data, it is really uncomfortable to modify these methods. Moreover, I feel really […]
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Time：2021-10-21
preface This series is derived from”Manon turned over”The reading activity initiated by the knowledge planet is sponsored by the [email protected] UDP does not lose packetsRecommended, there are some alternatives in this reading activity. We abandoned traditional books and began to introduce the top graduate course < 6.824 >, which was the inventor of worm virus […]
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Time：2021-10-21
background“A peak forms on the side of a mountain, and the distance is different. You don’t know the true face of Lushan Mountain, but you only live in this mountain.” you can reach “thousands of mountains in the same month, all households in spring. Thousands of rivers have water, thousands of rivers have moon, and […]
