blockchain advantages and disadvantages

Stored Procedures | Encapsulation SQL Server 2005 can write stored procedures in. NET languages, so in small and medium applications, it becomes a good choice to use the stored procedure encapsulation application logic. The advantages of using stored procedures to encapsulate application logic are as follows: 1, Dba+developer Division of labor Clear. Code modularity between. Reduce database operator and programmer errors. 2. Database security; You

Label:In general, the index will speed up the query, but will affect the insertion, modification, deletion of data, and occupy the physical space;So we should create the index reasonably, and we should create the aggregate index first, and then create the non-aggregated index.To create an index on a column that is frequently queried, and avoid too many indexes if the table columns are small;Advantages Detailed Description:Creating an index can greatly

the form of a two-dimensional table! a two-dimensional table is made up of rows and columns, knowing that the row and column numbers will be able to locate the data in the table! Excel is a two-dimensional table! Easy to use, the basic common SQL language makes it easy to operate relational databases! SQL is supported , so complex queries can be made! easy to maintain, rich integrity (domain integrity, entity integrity, referential integrity, and custom integrity) greatly reduces data redun

created, it waits for the first time to execute. At that time, the stored procedure was optimized, and the query plan was compiled and cached on the system. When you run the stored procedure several times, the cached query plan is used instead of creating a new query plan, unless specified by using the WITH RECOMPILE option. This means that each time the stored procedure is used, the stored procedure skips a lot of optimizations and compilation work. The exact time to save depends on the comple

complexity of the application index-ready file is O (n).C) Poll use Nfds to specify the maximum number of file descriptors and events to listen to, this number can reach the system agreed to open the largest file description of the descriptor. That is, 65535.D) can only work in the LT mode.3) Epoll:A) epoll the file Description descriptor and events of the user's booklet into the event table in the kernel. Provides a stand-alone system call Epoll_ctl to manage user events, and epoll the way cal

Label:The benefits of a relational database:1. Maintain data consistency (transaction processing)2. Due to standardization, the cost of updating data is small (the same fields are basically only one place)3. Complex queries such as joins can be madeOne of the best advantages of relational databases is the ability to maintain data consistency.The lack of a relational database:Not good at handling1. Write processing of large amounts of data2. Index or t

With the increasing demand for real-time Web applications, ServerPush technology has become the core of real-time application data streams in terms of chat, message reminders, especially social networks. This log attempts to explore various Push implementation methods suitable for PHP and their advantages and disadvantages. With the increasing demand for real-time Web applications, Server Push (Push) techno

This article describes the advantages and disadvantages of three Linux server monitoring technologies, including SNMP proxy (client), SSH, and private proxy (client) installation. The powerful functions and beautiful interfaces of the linux system make many enterprises use the linux system as the server. below are three types of introduction... This article describes the

PHP is also a commonly used advanced computer language. We will introduce the advantages and disadvantages of the PHP framework in this article and share it with you as a reference. The main reference PHP frameworks include: codeigniter, CakePHP, zendframework, and symfony. I have not used many frameworks seriously, but I just tried it for a while. Many ideas may be immature or incorrect. please correct me

I recently learned about Ajax and consulted some Ajax materials online, mainly about Ajax technology and its advantages and disadvantages. Here, I want to make a small Summary of the information I have collected. Most of the information is from the internet. I will only make a Classification summary here, I hope it will be helpful to my friends who are learning Ajax just like me. First, let's take a look at

Real IP addresses and their advantages and disadvantages Asp.net Real IP addresses and their advantages and disadvantages Asp.net Http://tech.aspxsoft.com/aspnet/2006-3-16/425.aspx

no single point of failure Random access performance comparable to MySQL HBase Advantages 1) Large storage capacity, a table can accommodate hundreds of millions of rows, million columns; 2.) can be retrieved through the version, can search the required historical version of the data; 3.) When the load is high, the horizontal slicing expansion can be achieved by simply adding machines, and the seamless integration with Hadoop guarante

graduates not only need lofty ideals, but also have passion, mobility, leadership, business credit, and strong adaptability, graduates are still lacking in mind, market vision, and leadership. People who want to start a business do not have to rush for a moment. They enter a good company, accumulate rich experience and contacts, and resign and start a business more appropriately, with a higher success rate. 8. free occupation Benefits: Give full play to your talents and hobbies, free time

: ★★☆☆☆ 2. Add empty div tag at the end Clear:both Principle: Add an empty div, use CSS to improve the clear:both clear floating, so that the parent div can automatically get to the height Advantages: Simple, less code, good browser support, not prone to strange problems Disadvantages: Many beginners do not understand the principle; if the page floating layout more, it is necessary to

The Struts framework has the advantages of modular components, flexibility and reusability, and simplifies the development of MVC-based Web applications. Hibernate is an open source object link ing framework. Spring is an open-source project and is currently very active. This article mainly introduces the advantages and disadvantages of hibernate, struts, an

The advantages and disadvantages of Oracle Database indexes are mdash, mdash, and learning notes. The main advantage is convenient query and improved system performance. By creating a unique index, you can ensure that the database The advantages and disadvantages of Oracle Database indexes are mdash, mdash, and learni

"Reprint" The advantages and disadvantages of DELEGATE,NOTIFICATION,KVO three modes in iOS for communicationOriginal address:http://blog.csdn.net/yangxt/article/details/8176636In developing iOS, there are three modes for communicating between controllers:1. Entrust delegation;2. Notification Centre Notification Center;3. Key value Observing,kvoSo why do we need these patterns and when to use it and when not

Advantages and disadvantages of data center Power Supply System Solutions As a protection for the normal operation of the data center, the design and selection of UPS have core significance for the construction of the power supply system of the data center. In the current use of the data center, direct parallel and 2N power supply solutions are the most common. Single-host power supply scheme, Hot Backup s

corresponds to an action class (or Dispatchaction), in other words: in struts it is actually a form that only corresponds to one event, and struts is called the application event, Application events is a coarse-grained event compared to the component event.Struts important Form Object Actionform is an object that represents an application that contains at least a few fields that are input fields in a JSP page form, because a form corresponds to an event, so When we need to refine the event gran

Index advantages and disadvantages: 12th pages. Why should I create an index? This is because creating an index can greatly improve the system performance. First, you can create a unique index to ensure the advantages and disadvantages of indexes in database tables. Why create an index? This is because creating an ind