blockchain advantages and disadvantages

Object-oriented and process-oriented programming can only be used in many programming languages, but PHP is different from other programming languages, that is, we can freely choose orIf you are new to PHP, writing code in PHP's process-oriented style may be your only choice. However, if you often go to PHP forums and newsgroups, you should see articles about "objects. You may also see tutorials on How to Write object-oriented PHP code. Or you may have downloaded some ready-made class libraries

software similar to Nginx/lvs/haproxy, which is implemented at the software level, so it's very inexpensive.At present, the structure of the Web site architecture is generally more reasonable: the Web front-end uses nginx/haproxy+keepalived as the load balancer, and the backend uses the MySQL database as a master and read-write separation, using the lvs+keepalived architecture. Of course, according to the specific needs of the project plan.The following is the respective characteristics and app

1, Nginx advantages compared to Apache:Nginx lightweight, the same Web services, more than Apache occupy less memory resources;Anti-concurrency, Nginx processing request is asynchronous non-blocking type, Apache processing request is blocking type, so in dealing with high concurrency is nginx can keep low resource consumption and high performance;Highly modular design, relatively simple to write modulesHigh-performance modules produced quickly;The

implemented with LUA Apache is the most popular, why? Most people are lazy to update to nginx or learn new things # # ...12, for Nginx, I like it configuration file written very concise, regular configuration makes a lot of things easy to run high efficiency, less resources, powerful proxy, very suitable for the front-end response server# #看了一下, nginx configuration file is really more concise and easy to understand13. Apache in the processing of dynamic has

sample cardinality (up to 200), and some combine two sub models to handle both fast and slow updates. In fact, the selection of replaced samples to update the background model, in essence, is the sample life problem, the traditional way to use the first out of the replacement strategy. The probability of each sample being selected as a replacement sample is equal in the vibe background model, which is independent of the length of the sample's existence time, which guarantees that the sample lif

When multithreading technology is used and when to avoid it is an important topic we need to master. Multithreading is a double-edged sword. Its advantages and disadvantages must be fully considered during use.Multi-threaded processing can run multiple threads at the same time. Multi-threaded applicationsProgramDividing programs into multiple independent tasks can significantly improve performance in the fo

customer, you first have to get people to visit your site, and to do that, you have to turn to the search engine. You spend a lot of time, energy, and money opening an online store, but deliberately not allowing search engines to retrieve you, it's like opening a retail store, but all the windows are painted black, and no sign is hanging.2, frame structure sometimes confusing people, especially in a few frames appear up and down, left and right scroll bar. In addition to crowding out a very lim

Stored procedures improve the reusability of execution plans by explicitly converting the variable portions of the query to parameters. This enables the execution plan to be reused when the query is resubmitted with the same or different values in a mutable part. A stored procedure contains a complex set of SQL statements, which makes the execution plan of the build stored procedure somewhat expensive. Therefore, it is often advantageous to reuse the execution plan of a stored procedure instead

There is not much understanding and use of XML. This is a summary of the advantages and disadvantages of XML in the video of a lecture. Sorry! I will continue to learn about XML. Advantage: scalabilityAlthough XML has many other characteristics, its scalability is self-evident. It can be said that "nothing is part of XML extension ". In business design, the scalability of the business is very related to th

ability, in the decision-making process application more.KNN algorithm and the advantages of KNN algorithm1, KNN is an online technology, new data can be directly added to the data set without retraining2, KNN theory is simple, easy to achieveThe disadvantage of KNN algorithm1, for large sample capacity of the data set calculation is relatively large.2, when the sample is unbalanced, the prediction deviation is relatively large. such as: A certain cl

The content of this section: The advantages and disadvantages of Nginx and Apache The advantages of nginx in relation to Apache:Lightweight, similarly web service, consumes less memory and resources than Apache serversAnti-concurrency, nginx in processing requests is asynchronous non-blocking, and Apache is blocking type, in high concurrency, nginx can keep low

Summary: The advantages and disadvantages of Apache vs. Nginx 1, Nginx compared to Apache advantage: Lightweight, the same Web services, more than Apache occupy less memory and resources anti-concurrency, Nginx processing requests are asynchronous non-blocking, and Apache is blocking type, In high concurrency, nginx can keep low ... Comparison of the advantages

, it can load balance almost all applications, including HTTP, databases, and online chat rooms. LVS has the following Disadvantages: 1. software itselfRegular Expression Processing is not supported, and dynamic/static separation cannot be performed.But now many websites have strong requirements in this regard. This is the advantage of nginx/haproxy + keepalived.2. If there are a large number of website applications, the implementation of LVS/DR +