nosql advantages and disadvantages

I. preface some time ago, I have translated an article about changing your website from MySQL to PostgreSQL, in fact, I was more interested in the specific operation of converting the background database of an application from MySQL to PostgreSQL, and did not care about the advantages and disadvantages of MySQL and PostgreSQL. I did not expect an unexpected response, therefore, I think it is necessary to wr

that proves to be an application problem is not the thread's disadvantage.The advantages of line threads for processes:1. Low Overhead2. Sharing of resources is good.Line threads disadvantages for the process:1, shared resources need to spend a certain amount of lock resources, synchronization is relatively complex.2. A thread crash can cause the entire process to crash, which of course is problematic for

A comparison between sequential storage structure and chain-type storage structure Advantages and disadvantages in order to store, adjacent data elements are also adjacent to the storage address (logical and physical unity); The address of the available storage units in memory must be contiguous. Advantages: Large storage density (=1), high storage space utiliz

Advantages and disadvantages of indexing Why do you want to create an index? This is because creating an index can greatly improve the performance of the system. First, you can guarantee the uniqueness of each row of data in a database table by creating a unique index. Second, you can greatly speed up the retrieval of data, which is the main reason to create indexes. Third, you can speed up the connection

that the composite column length cannot be too long; In a composite index, all columns must be from the same table, and composite columns cannot be created across tables In a composite index, the order of the columns is very important, so the order of the columns is carefully arranged, in principle, the most unique column should be defined first, for example, the index on (col1,col2) is not the same as the index on (col2,col1), because the order of the two-indexed columns is different ; for the

composite index, the total length of the columns that make up the composite index cannot exceed 900 bytes, which means that the composite column length cannot be too long; In a composite index, all columns must be from the same table, and composite columns cannot be created across tables In a composite index, the order of the columns is very important, so the order of the columns is carefully arranged, in principle, the most unique column should be defined first, for example, the index on (col1

Let's talk about the advantages and disadvantages of Ajax. Ajax, short for Asynchronous Javascript and XML, is a dynamic WEB application development technology that enriches the user experience. Even WEB applications developed with Ajax can experience desktop applications. Of course, like other technologies, Ajax also has its own advantages and

Tags: redis disadvantages advantages I recently used redis in my project. So I am looking at the redis source code. Next I plan to introduce the overall situation of redis and gradually write the redis source code functions. However, before doing anything, you should consider its advantages and disadvantages. Therefore

Compares the advantages and disadvantages of several mainstream PHP frameworks. 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 of my views may be immature.The main reference PHP frameworks include: CodeIgniter, CakePHP, ZendFramework, and Symfony. I have not used many frameworks ser

The advantages and disadvantages of PHP code, the advantages and disadvantages of PHP code, the excellent PHP code should be structured, and the excellent PHP code should be standardized; excellent PHP code should be adaptive; excellent PHP code should be safe ...... When I was an interviewer at SitePoint, I was certai

From: http://database.ctocio.com.cn/116/12198616.shtmlThe followingArticleThis article mainly introduces the advantages and disadvantages of Oracle Database indexes. If you want to know the advantages and disadvantages of Oracle Database indexes, you can use the following articles to understand its practical applicatio

the efficiency.But between security and efficiency, the first thing to consider is security. The premise of synchronization one, multiple threads to perform the time required synchronization, if it is a single thread does not need synchronization. More than one thread is using the same lock during execution. If it is, it is synchronous.Otherwise, it is not synchronized. Synchronzied (obj) {} The same synchronzied (new Object) {} is not the same lockSynchronize the code that needs to be synchron

Now many websites have used the div+css to layout the webpage structure, the advantage is the speed is fast, may the negative influence, see below analysis Front-End time to write a "use of CSS framework for efficient site development", a lot of friends asked me related questions. Very early 5key in the company for the framework of CSS frameworks, but also to many friends of the proposed CSS framework. The effect is very obvious. Of course, the CSS framework has

Hello everyone, today to share with you the pros and cons of free space problem. Now a lot of domain name business host space vendors in vigorously promote the free things. So how much do you know about the free stuff? Everyone knows you can get it without money. But you only see the surface, do not see the inner side, think about it, the General people will give you free of what the concept, others can not lose money to you on the free throw, for you to use it. Once heard an old-timer said a wo

Front-End time to write a "use of CSS framework for efficient site development", a lot of friends asked me related questions. Very early 5key in the company for the framework of CSS frameworks, but also to many friends of the proposed CSS framework. The effect is very obvious. Of course, the CSS framework has advantages and disadvantages, and recently read some related articles. Some thoughts, share with yo

NOTE: For the following content, refer to Chapter 6 of "building a high-availability Linux Server" of fuqin liquor. It is relatively simple to set up a high-availability server Load balancer environment, mainly to understand the principle. This article describes the advantages and disadvantages of the three load balancers so that they can be selected as needed in actual production applications. Currently, t

to the session problem of a method, suggest concern; ⑤ri, representing the url_hash of the Nginx, according to the requested URI; ⑥rl_param, representing the URL parameter ' balance Url_param ' requires an URL parameter name according to the request; ⑦HDR (name), which indicates that each HTTP request is locked according to the HTTP request header; ⑧rdp-cookie (name), which indicates that each TCP request is locked and hashed according to a cookie (name).

It is relatively simple to build a load-balanced high availability environment, mainly to understand the principle. This article describes the advantages and disadvantages of three load balancers, so as to be in the actual production applications, according to the requirements of choice.At present, the online environment in the application of more load Balancer hardware F5 big-ip, software has Lvs,nginx and

Transfer from http://tianzongqi.iteye.com/blog/1458002Advantages and disadvantages of XML configuration: Advantages: The XML configuration approach further reduces coupling, making the application easier to scale, even if the configuration file is further modified and does not require engineering modification and recompilation. The XML configuration should be better when dealing with large

Excerpt from: ExtJS features, advantages and disadvantages and precautions1. What is ExtJS?ExtJS can be used to develop the RIA and rich client Ajax applications, is written in JavaScript, mainly for the creation of the front-end user interface, is a background technology-independent front-end AJAX framework. As a result, ExtJS can be used in applications such as. Net, Java, PHP, and many other development