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Elasticsearch concept and query syntax ES is an open source search engine written in Java. It uses Lucene internally for indexing and searching. By encapsulating Lucene, it hides the complexity of Lucene and provides a set of simple and consistent restful APIs instead. However, elastic search is not only Lucene, but also a full-text search en ...

Article catalogwhat's pseudo sharingWhy does pseudo sharing occurHow to avoid pseudo sharingSummarywhat's pseudo sharingIn order to solve the problem of running speed difference between main memory and CPU in computer system, one or more levels of Cache will be added between CPU and main memory. This Cache is generally integrated into the CPU, ...

HTML5 final assignment: game website design - responsive game website (24 pages) HTML+CSS+JavaScript discussion on making online game web pages Common web design topics include individuals, food, companies, schools, tourism, e-commerce, pets, electrical appliances, tea, home, hotels, dance, animation, stars, clothing, sports, cosmetics, log ...

In the project, mybatis is used as the persistence layer framework and mysql database. Before the project goes online, the DBA requires us to set the fields in each database table to the default value and not null. In the previous project, some insert statements listed all the fields in the table, and then used it as a general insert statement. ...

Article catalogsummaryLimitations of RandomApplication and principle of ThreadLocalRandomuseprincipleThreadLocalRandom source code analysisThreadLocalRandom current()int nextInt(int bound)SummarysummaryThreadLocalRandom class is a new Random number generator added by JDK 7 under the JUC package. It makes up for the defect of Random class under ...

As we all know, TRUNCATE TABLE is a way to quickly empty the data in the table. Different from delete, truncate only produces very few redo and undo, which realizes the function of clearing the table data and reducing the HWM of the table. This paper mainly focuses on the implementation principle of TRUNCATE TABLE and the recovery of TRUNCATE T ...

Intuitively, data seems easy to understand, but it's a little difficult to really say the word data. Think about it, what is the data? The definition of data actually includes two aspects: information symbol and design. The design of information, that is, the format of data, determines the difficulty of readers to obtain effective information ...

This section shares the Java thread pool. Next, let's dig up the thread pool step by step. Introduction: old three withdraw money There is a programmer whose name is Lao San. The third man had no money in his pocket and hurried to do banking business. This day got up early in the morning and the bank sister said good morning. As soon a ...

Code address of this series: https://github.com/JoJoTec/sp...In this section, we first analyze some other points of Spring Cloud Gateway that may lose link information, then make some designs that can avoid link information loss, and then implement some customized globalfilters we need based on this designOther points of Spring Cloud Gateway th ...

1, IOC Simple Science Popularization IOC is the Inversion of Control (IOC) If you need to use many member variables F1 and F2 in a class A. Traditional writing: if you want to use these member variables, you can use new F1(), new F2(), etc. The IOC principle is: No! We don't want new. In this way, the coupling is too high. Once the construction ...