what is mongo database

! What are the benefits of Node? So far, you may be able to answer the question "What is Node", but you may have another question: "What is the purpose of Node ?" This is an important question that needs to be raised, because some

What do you call office software? The word office automation is very familiar to everyone, its English name is office automation, abbreviation OA. In the early 80, when the domestic computer technology increasingly popular, office automation is almost synonymous with computer applications, many units or individuals to

DBA30 asked what are the functions of the system DB, and how to restore the database due to damage (mainly the master database) Master Database Record SQLAll system-level information of the Server system. This includes metadata of the instance range (such as Logon account ), Configure endpoints, linked servers, and

Often listen to friends say what Java EE, finally know what is the Java EE, Khan, the Internet search the next this said more detailed, J2EE,JAVA2 Platform Enterprise Edition (Java 2 Platform Enterprise Edition), It is the standard platform that Sun company launches for the Enterprise class application. The Java platfo

What is a foreign key A foreign key (FK) is one or more columns that are used to establish and strengthen a link between two table data. You can create a link between two tables by adding one or more columns that hold the primary key values in the table to another table. This column becomes the foreign key of the second table. Why foreign keys are used. Ensu

What is the framework and why it should be used. what does the framework solve. I just learned it. place a simple select result on the webpage. simply write the php code. what is the framework used. the entire framework has a lot of code and does not understand it. the ghost

the domain name resolution file hosts what files. What's the effect? 1. Speed up Domain name resolutionFor Web sites to visit frequently, we can configure the domain name and IP mapping relationships in hosts so that when we enter a domain name computer, we can quickly resolve IP without requesting a DNS server on the network.2. Easy LAN UsersIn many units of the local area network, there will be a server for users to use. However, because the LAN

Source: https://www.scarydba.com/2017/06/20/database-fundamentals-3-whats-database/Grant FritcheyTranslation: Shesheni Liu Jongmao Xu Yali Lai HuifangPresidentIt is important to note that many people do not need to create their own databases. You may also not create your own tables or other data structures. You may also need to run backups, re-store and secure th

non-relational data storage;Ii. What is the difference between Entity Framework7　　1. What is the same as the previous version?When using it, the top-level interface is basically the same as the previous version,A, you can still inherit the DbContext context object, and stil

SQLServer fragmentation: The difference between physical disk fragmentation and database fragmentation. Every time we mention "Fragmentation", we naturally think of the disk fragmentation in our computer. In the database, we mentioned fragmentation, which is often confused because we have heard of index fragmentation in some places. Finally, I

What is memcached? Memcached is a set of distributed memory object caching systems developed by danga.com (the technical team of operations LiveJournal) to reduce database load and improve performance in dynamic systems. Many people use it as a storage carrier of the same form as sharedmemory, although memcached uses

XML can be used to extend the markup language (Extensible Markup Language ). A tag is an information symbol that a computer can understand. Through this tag, a computer can process articles that contain various information. To define these tags, you can select an international markup language, such as HTML, or use a markup language that is freely determined by people like XML. This

the instance, requiring the entity to be a persistent stateQ setmaxresults (int maxResults): Sets the size of the paging *********************************************When the hibernate profile is automatically generated in the previous log, the GetSession () method is used in the DAO layer to manipulate the database records, but there

XML to extend the markup language (Extensible Markup Language ). A tag is an information symbol that a computer can understand. Through this tag, a computer can process various types of information.Article. To define these tags, you can either select an international markup language, such as HTML, or use a markup language that is freely determined by people like XML. This

Why can I use the int type for the time field in the mysql database? what are the advantages of the datetime type? I have seen some mysql database designs, such as the time field in the phpwind Forum, using int (10 )? It indicates that the time already has the datetime type. why should we use the int type? What are the

QQ is added, and the submitted data is not stored. what's the problem? in the recommended registration file, only the user name and password can be entered. I want to add a QQ user, however, QQ is not stored in the table. what is the problem? You can add users to the backe

under database a Dbo.prtesta EXEC dbo. Prtesta The following error will appear: The context of the transaction is being used by another session. I believe you already understand what is called loopback link Server , when we change the dbo.prtestb of the stored procedure in databas