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Anonymous users2024-02-06A database system consists of a database (DB), a data management system (DBMS), applications, users, and hardware, the most critical part of which is the database.
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Anonymous users2024-02-05Oh beer, you can just ship the section as soon as possible Love your parents as a way to alleviate the way to send the first opportunity to report it illegally on time and patriotic good ui not Halfa Alas, Anhui Harbin home legalization.
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Anonymous users2024-02-04The database system consists of 4 parts:
1. Database (DB) refers to a collection of organized and shareable data stored in a computer for a long time. The data in the database is organized, described and stored according to a certain mathematical model, with small redundancy, high data independence and easy scalability, and can be shared by various users.
2. Hardware: The various physical devices that make up a computer system, including external devices required for storage. The hardware should be configured to meet the needs of the entire database system.
3. Software: including operating systems, database management systems and applications. Its main functions include: data definition function, data manipulation function, database operation management and database establishment and maintenance.
4. Personnel: There are four main categories. The first category is system analysts and database designers; The second type is the application worker, who is responsible for writing applications that use databases.
The third category is the end user, who uses the system's interface or query language to access the database. The fourth type of user is the Data Base Administrator (DBA), who is responsible for the overall information control of the database.
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Anonymous users2024-02-031. Database: A place where data is stored.
A database provides a storage space to store all kinds of data, and you can think of the database as a container for storing data.
2. Database management system: software used to manage databases.
The database management system is the software used by users to create, manage, and maintain databases, which is located between users and the operating system to manage databases in a unified manner.
3. Database application: In order to improve the processing capacity of the database system, the software supplement used to manage the database library.
The database application is responsible for communicating with the DBMS, accessing and managing the data stored in the DBMS, allowing users to insert, modify, and delete data in the database.
Basic requirements for a database system.
1. It can ensure the independence of data. The independence of data and programs is conducive to speeding up software development and saving development costs.
2. There is less redundant data and a high degree of data sharing.
3. The user interface of the system is simple, easy for users to grasp and easy to use.
4. It can ensure the reliable operation of the system and can be quickly eliminated when there is a fault; Ability to protect data from unauthorized access or destruction; Error data can be prevented, and once it is generated, it can be detected in time.
5. Have the ability to reorganize data, change the storage structure or data storage location of data, adapt to the changes in user operation characteristics, and improve the situation of data organization and spatiotemporal performance deterioration caused by frequent insertion and deletion operations.
6. It is modifiable and extensible.
7. Be able to fully describe the internal relationship between data.
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Anonymous users2024-02-02To put it simply, a database system consists of three parts: hardware, database, and database management system.
1. The database system is a system composed of a database and its management software, usually composed of software, database and data administrators.
Its software mainly includes operating systems, various host languages, utilities, and database management systems. The database is managed by the database management system, and the insertion, modification and retrieval of data are all carried out through the database management system.
2. The database is a warehouse for storing data, and its storage space is very large, which can store millions, tens of millions, and hundreds of millions of pieces of data. It has a lot of **, such as travel records, consumption records, web pages browsed, messages sent, and so on. In addition to text-type data, images, **, and sounds are all data.
3. How is the database managed?
Databases are backed up on a regular basis, because some data is subject to change, and backups can record data at a point in time, and even if the database fails, it can be restored at any time. Reduce the number of interactions between applications and databases, the number of executions of the same SQL statement, and make full use of database caches and application caches for frequently accessed data. Wait a minute.
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Anonymous users2024-02-015.What are the components of a database system? The database system consists of three parts, namely:
databases, database management systems, and database administrators. The database system is an ideal data processing system developed to meet the needs of data processing. It is also a software system that provides data for the actual storage, maintenance, and application operating system.
It is a collection of storage media, computing objects, and management systems.
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Anonymous users2024-01-31Database, software, hardware, and personnel.
You can make an information query system, if you haven't done it before, it is recommended to use ASP to write it first, this is relatively simple, even people who do not have a basic knowledge of network programming can get started in a short period of time. The written web program can be called on the network, and different permissions can be set for different users. In this way, you can achieve the function you want, but this is only the basic, and you should learn more deeply to achieve more complete functions. >>>More
The database is generally composed of many tables, for example, the school builds a database, which can build a student table (including the student's name, age, student number, class, date of birth), a teacher table (including the teacher's name, age, teaching class, teaching category), a report sheet (including the student's student number, and the grades of each subject), etc. These are the ways in which the files are stored in the database, and try to make sure that the items in a table are closely related and have the same attributes, if this condition cannot be met, a table must be built (the redundancy of the built table has 4 levels). In order to meet the user's query needs, we also need to make a number of views, for example, you can make a view of his items have the name of the student, age, grades of each subject, and the teacher of each subject, etc., we can also export new items according to the existing items, for the purpose of simplicity, for example, the view can add an average grade, we add different permissions and roles to each view, and provide it to different people to query to protect the security of the database. >>>More
Create a database.
Select the Program Management SQL Server 2008 SQL Server Management Studio command in the Start menu to open the SQL Server Management Studio window and establish a connection using Windows or SQL Server authentication. >>>More
First: you are lazy and push everything to someone else.
Second: There are no bonus points for your question. >>>More
function updatepage(targetobject){if( == 4){
var response = ;Assign the value returned by ajax to the responseIf you want to use this variable, you can call it directly, or you can return it outside of the function. >>>More