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What are the different types of databases?
There are three kind of database mainly . First is network database it which we consider data is linked to other data by the means of some link.
Second is object oriented database, that helps to include features like abstraction, encapsulation etc.
Third is Hierarchical database , that follows a simple sequence or hierarchy of data , there are nodes and a main root.
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This is the most common of all the different types of databases. In this, the data in a relational database is stored in various data tables. Each table has a key field which is used to connect it to other tables. Hence all the tables are related to each other through several key fields.
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The different types of relationships in a database are; one-to-many relationships, many-to-many relationships, one-to-one relationships. One to one is the most commonly used,… a row in table A can have a lot of matching rows in table B but table B can only have one matching row in table A. Many to many is when a row in table A can have a lot of matching rows in table B and table B can have a lot of matching rows as table A. One to one is when a row in table A can only have one matching row in table B and the same with table B
* Alternate key - An alternate key is any candidate key which is not selected to be the primary key * Candidate key - A candidate key is a field or combination of fiel…ds that can act as a primary key field for that table to uniquely identify each record in that table. * Compound key - compound key (also called a composite key or concatenated key) is a key that consists of 2 or more attributes. * Primary key - a primary key is a value that can be used to identify a unique row in a table. Attributes are associated with it. Examples of primary keys are Social Security numbers (associated to a specific person) or ISBNs (associated to a specific book). In the relational model of data, a primary key is a candidate key chosen as the main method of uniquely identifying a tuple in a relation. * Superkey - A superkey is defined in the relational model as a set of attributes of a relation variable (relvar) for which it holds that in all relations assigned to that variable there are no two distinct tuples (rows) that have the same values for the attributes in this set. Equivalently a superkey can also be defined as a set of attributes of a relvar upon which all attributes of the relvar are functionally dependent. * Foreign key - a foreign key (FK) is a field or group of fields in a database record that points to a key field or group of fields forming a key of another database record in some (usually different) table. Usually a foreign key in one table refers to the primary key (PK) of another table. This way references can be made to link information together and it is an essential part of database normalization
Logical View Physical View End-user View
A database is a file. A database server is a computer that shares that file over a network.
Database is the data stored in the server and Database administrator is the person who designs the database.
The Star & Snowflake are two common type of database Schema.
4 Types of Database Users Users are differentiated by the way they expect to interact with the system: · Application programmers - interact with syst…em through DML calls. · Sophisticated users - form requests in a database query language. · Specialized users - write specialized database applications that do not fit into the traditional data processing framework. · Naive users - invoke one of the permanent application programs that have been written previously. FROM: Database Systems Concepts 1.17 Silberschatz, Korth and Sudarshan c1997
In general, a database is a collection of related data. In more specific terms, a database is typically a collection of computer files, usually stored on disk, used to contain… and manage this data. The logical structure of a database (as organized in tables, indexes, views, etc.) does not necessarily correspond directly to its physical structure (the data files, transaction log files, etc.). A database instance is the instantiation of memory structures and processes by a database management system manages the logical and physical structures and the data organized and stored therein. An application program must connect to and interact with the database instance in order to insert, retrieve, modify, and/or delete data stored in the database.
1) End User 2) Database Admin 3) Database Designer 4) System Analysts and Programmers 5) System Administrator *Database Systems 8th Edition
1. relational database management system(RDBMS) 2. object Rdbms. 1. relational database management system(RDBMS) 2. object Rdbms.
Ans: -- stored Database can supported languages, SQL -Structured query language. QL - object-oriented Data log (4D QL) - 4D Query Language. Hibernate… Query Language (HQL) - A Java-based tool that uses modified SQL QBE - Query By Language
A DBMS can support many different types of databases. Databases can be classified according to the number of users, the database location(s), and the expected type and extent …of use. The number of users determines whether the database is classified as single-user or multiuser. A single-user database supports only one user at a time. In other words, if user A is using the database, users B and C must wait until user A is done. A single-user database that runs on a personal computer is called a desktop database. In contrast, a multiuser database supports multiple users at the same time. When the multiuser database supports a relatively small number of users (usually fewer than 50) or a specific department within an organization, it is called a workgroup database. When the database is used by the entire organization and supports many users (more than 50, usually hundreds) across many departments, the database is known as an enterprise database. Location might also be used to classify the database. For example, a database that supports data located at a single site is called a centralized database. A database that supports data distributed across several different sites is called a distributed database. The extent to which a database can be distributed and the way in which such distribution is managed are addressed in detail in Chapter 12, Distributed Database Management Systems. The most popular way of classifying databases today, however, is based on how they will be used and on the time sensitivity of the information gathered from them. For example, transactions such as product or service sales, payments, and supply purchases reflect critical day-to-day operations. Such transactions must be recorded accurately and immediately. A database that is designed primarily to support a company's day-to-day operations is classified as an operational database (sometimes referred to as a transactional or production database).
There are various types of databases available in the marketOracle database belongs to Oracle CoporationSql Server belongs to Microsoft CoporationMysql belongs to MySQL AB (fo…unded 1995, acquired by Sun Microsystems 2008)Sybase belongs to SyBase
Answer . A database is something that stores data. Using tools called Database Management Systems(like Oracle, Informix, Sybase, DB2), you can create, view, modify, and de…lete databases.\n. \nDatabases can be \n-Relational\n-Object Oriented\n-Object Relational\n. \nRelational database stores data in tables(called realtions). These tables are related to each other.Just like in our family, our relations are related with each other.\n. \nIn Object Oriented Databases, the information is stored in the form of Objects as in Object Oriented Programming.OODBMS makes database objects appear as programming language objects in one or more porgramming languages.\n. \nObject relational databases combine the features of both Object Oriented as well as Relational databases. Here you can not only store simple data like text in relational, but you can also store complex objects like images, audio and video in tables.
DBMS stands for Database Management System which is a general term for a set of software dedicated to controlling the storage of data. RDMBS stand for Relational DataBase Ma…nagement System. This is the most common form of DBMS. Invented by E.F. Codd, the only way to view the data is as a set of tables. Because there can be relationships between the tables, people often assume that is what the word "relational" means. Not so. Codd was a mathematician and the word "relational" is a mathematical term from the science of set theory. It means, roughly, "based on tables". Answer DBMS includes the theritical part that how datas are stored in a table.It does not relates tables with another. While RDBMS is the procedural way that includes SQL syntaxes for relating tables with another and handling datas stored in tables. Answer 1)rdbms is object based database management system while dbms 2)rdbms can maintain at many users at same time while dbms not 2)in rdbms is relation is more important than object itself while dbms entity is more important Answer The main advantage of an RDBMS is that it checks for referential integrity (relationship between related records using Foreign Keys). You can set the constraints in an RDMBS such that when a paricular record is changed, related records are updated/deleted automatically. Answer ORDBMS = ODBMS + RDBMS = (O + R) * DB * MS. On a logical level, an ORDBMS is the MS process methods applied for DB data structure, which is complied with O object and R relational concepts. Answer A database has to be persistent, meaning that the information stored in a database has to continue to exist even after the application(s) that saved and manipulated the data have ceased to run. A database also has to provide some uniform methods that are not dependent on a specific application for accessing the information that is stored inside the database. An RDBMS is a Relational Data Base Management System. This adds the additional condition that the system supports a tabular structure for the data, with enforced relationships between the tables. Answer the difference is dbms has no tables while rdbms has and also it describes about the relationships among the tables dbms for small organisatiions where rdbms for large amonut of data Answer the difference between dbms and rdbms is that it doesn't show the relation while rdbms show the relation and moreover dbms is for small organisations where rdbms for large amount of data Answer In DBMS all the tables are treated as different entities. There is no relation established among these entities. But the tables in RDBMS are dependent and the user can establish various integrity constraints on these tables so that the ultimate data used by the user remains correct. Answer In DBMS there are entity sets in the form of tables but relationship among them is not defined while in RDBMS in each entity is well defined with a relationship set so as retreive our data fast and easy. Answer In DBMS tables are not related. In RDBMS tables are related In DBMS only one user can access the same database, at the same time. In RDBMS many users simultaneously access the same database RDBMS is more secure than DBMS In DBMS store and retrieve small amount of Data In RDBMS store and retrieve large amount of Data Answer DBMS : - Set of data and tools to manage those data. - Will not support RELATION SHIP between data. - Ex : - Foxpro data files and earlier Ms Access. RDBMS : - Same as DBMS - Will Support RELATION SHIP between Tables. - Ex : - ORACLE,SQL 2000,DB 2 ... Answer dbms support 6 rules which were proposed by the developer of dbms and where as rdbms follows 8 rules which were proposed by the developer of rdbms. Answer 1. dbms is a single user system rdbms is a multiuser system 2. dbms stores do not store data in the form of tables while rdbms stores it in the form of tables. 3. most of dbms are not supporting client/server architecture as it is supported by rdbms. 4. most dbms do not support distributed databases DBMS - Database MAnagement System Different types of dbms 1.DBMS simple databses management system , dbms does not support codd rules more than 5/6 rules. 2.RDBMS like sql server,mysql . Rdbms support more than 7 codd rules 3. ORDBMS like oracle 9i or later version Answer: DBMS refers to DataBase Management System and relatioonal data structure is the way of organizing the data stored so that each attribute is related to one another and that's y they are used for geographic information storing purposes. Answer A Database Management System (DBMS) is a set of computer programs that controls the creation, maintenance, and the use of the database in a computer platform or of an organization and its end users. It allows organizations to place control of organization-wide database development in the hands of database administrators (DBAs) and other specialists. DBMSs may use any of a variety of database models, such as the network model or relational model. In large systems, a DBMS allows users and other software to store and retrieve data in a structured way. It helps to specify the logical organization for a database and access and use the information within a database. It provides facilities for controlling data access, enforcing data integrity, managing concurrency controlled, restoring database. Answer well, DBMS differences depends upon many aspects likewise: Vendors, Security, Easy to access(UI) etc.. according to my opinion based on security ORACLE is far better than others..
Two main types: Relational Calculus based Language Relational Algebra based Language. These languages provide similar set of operations but with different syntax. Calcul…us based is more kind of procedural and near to English, while Algebra based uses a set of symbols for queries.