cpr pros

Gossip does not say, we see the title, I use AAAAA and bbbbb two virtual Baidu to promote the account as an example for everyone to analyze the same promotion products of the different two accounts of the pros and cons. Let me first say a current state of the account: AAAAA This account gives the feeling is always very calm, this account of the key words, also on 5,000 words, but this account is still better than that new operation of the account BBB

null values in the database, and NULL is always the first in ascending order, so for different partition types, The MySQL database also handles null differently. For a range partition, if NULL is inserted into the partition column, the MySQL database puts the value in the leftmost partition, noting that if the partition is deleted, all content under the partition is deleted from the disk, the null partition is removed, and the null value is then deleted. To use null under the list partition, yo

This article focuses on encapsulating Ajax and asynchronous requests for Ajax, so let's take a look at this article. Ajax What exactly is Ajax? Ajax is a technique for creating interactive Web applications. Ajax application scenarios include: (map) real-time updates, form validation, etc... Advantages and disadvantages of Ajax: Pros: 1. Implement partial update (without refresh), 2. Reduces server-side stress Cons: 1. The browser's forward and backwar

more Excellent DELETE InnoDB it does not re-establish the table, but deletes one row at a COUNT without WHERE MyISAM more excellent. Because MyISAM saves the exact number of rows in the table InnoDB does not save the exact number of rows in the table, it requires progressive scan statistics, it is very slow COUNT with WHERE The same , InnoDB also locks the table Lock Only table locks are supported S

performance and retrieving performance are conflicting.When you increase the index, the retrieval performance is improved, but the performance of the modification is reduced. When you reduce the index, you increase the performance of the modification and reduce the retrieval performance.Therefore, you should not create an index when the performance of the modification is far greater than the retrieval performance.How to create an index:1. Create index, such as name of CREATE INDEX 2, modify the

const, EQ_REF, ref, range, index, and all, means that all records in the data table must be read once, corresponding to each record in the previous data table- This situation can often be avoided by an index).The Possible_keys data column gives the various indexes that MySQL can use when searching for data records. The Key data column is the actual mysql-selected index, which is given in the Key_len data column for the length of the byte count. For example, for an index of an integer data colum

Using MySQL will of course have access to the MySQL storage engine, which you will see when creating a new database and creating a new data table.MySQL default storage engine is MyISAM, other commonly used is innodb.What kind of storage engine is better? This question is inconclusive and needs to be measured in terms of your needs and circumstances. Therefore, the concept of the two engines, principles, similarities and differences and their respective advantages and disadvantages have a detaile

(but is not foolproof or should be passed to the database for additional validation).Disadvantages:1. If you change the scope to make changes to the parameters of the input stored procedure, or if you want to change the data returned by it, you still need to update the code in the assembly to add parameters, update the GetValue () call, and so on, which is more tedious to estimate.2. Portability is poorBecause stored procedures bind applications to SQL Server, using stored procedures to encapsu

This article mainly introduces the JS merged array of several methods and pros and cons comparison, this article explains the concat, loop insertion, reduce and other methods combined arrays, and their pros and cons to do a comparison, the need for friends can refer to the nextThis article belongs to JavaScript's basic skills. We will learn the various common methods of combining/merging two JS arrays, and

I feel a lot of projects. Using Java or C's multithreaded library + thread-safe queue data structure can basically achieve the Goroutine+channel development can achieve the requirements, so why say Golang more suitable for the development of concurrent service side? What are the pros and cons of developing with Goroutine+channel and Java multithreaded +queue queues?What are the pros and cons of developing w

This article focuses on almost all methods for adding underline styles, and compares the pros and cons of each Approach. did not expect to have not noticed before the underline there are so many mystery! This article is translated by nzbin, Ailing Wind School draft. Without permission, no reprint! English source: css-tricks.com Posted Address: http://web.jobbole.com/89425/ There are many ways to add an underscore style. Maybe yo

IOS Miscellaneous Pen-19 (attributes and the pros and cons of variables) In the previous article I covered the differences between attributes and variables.This blog I will briefly explain the pros and cons of attributes and variables.Variable Advantages:Fast access speedDisadvantages:Not flexible to useProperty Disadvantages:TakeAdvantages: Prevent objects from being created in advance Preve

Description: The following references the contents of the sixth chapter of "Building a highly available Linux server" Fuqin.It is relatively simple to build a high-availability environment for load balancing, mainly to understand the principles. This article describes the pros and cons of three load balancers so that they can be used in real-world production applications by demand.At present, the online environment in the application of more load bala

) pros and consThe advantages of the decision tree:The decision tree is easy to understand and explain. People have the ability to understand the meaning of decision trees after they have been explained.Second, for decision trees, the preparation of data is often simple or unnecessary. Other techniques often require that data be generalized first, such as removing extraneous or blank attributes.Third, the ability to handle both data and regular proper

SSH project, what is the difference between using gethibernatetemplate and getsession? What are the pros and cons, thanks for the answer!Reward Points: 0-resolution Time: 2008-10-7 09:42SSH project, what is the difference between using gethibernatetemplate and getsession? What are the pros and cons, thanks for the answer! Supplementary question: Thank you 451182The main thing is to find out what the differe

, JasperReports, Tiles, Velocity, and XSLT related classes for internationalization, labeling, Theme, view presentation. Of course, if your application uses a separate MVC framework, no classes in this jar file are required;Spring-webmvc-portlet.jar: Springmvc enhancement, Support Portlet standard (jsr168/jsr286);Via (if shown as initial)Third, the pros and consSpring has a lot of advantages, the benefits of each function module are not the same, such

Will there be such a feeling? It technology development knowledge is very broad and very deep, there will always be you do not understand the problem arises. One after another a new question, one after another a new challenge.Today, interpreting "inline pictures", what are inline images, and what are the pros and cons of using inline images? This is the question I interviewed a new startup company asked, and he said that the problem contains a lot of

TFS (Team Foundation Server) is a workflow collaboration engine that allows a team to use their customized processes and use a centralized data warehouse that is collected in real time in the project history.Advantages: Integration. The version control system and the work item memory are integrated at the time of registration. When registering, you can associate it with one or more work items. New concept: Shelveset Github:ruby Community programmers use git and can't find a good git hosting site

the permission control file as SVN supported UTF-8 format, a library can have multiple working directories but only one library can be used for a working directory although the location of the library may be changed but strict requirements, the library file storage method, do not see the real content of the file4. Advantages and disadvantages of Microsoft TFS:Advantages: It is the support of agile, Msf,cmmi and other projects, process management, process improvement. On the task page, you can t

lifetime of the content pointed to by the pointer (which may require the programmer to delete the requested memory at the appropriate time, but because of the efficient insertion/deletion of the pointer), the use of boost::any may avoid this situation, because we can store the type itself (of course, the pointer can be stored). This is one of the advantages of Boost::any.Boost::any Another advantage is that you can store any type. The previously mentioned mylist can only hold pointers to BaseCl