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Articles by Bhanu Priya
Page 59 of 107
Explain the characteristics of DBMS?
There are so many characteristics of a database management system, which are as follows − A database management system is able to store any kind of data in a database. The database management system has to support ACID (atomicity, consistency, isolation, durability) properties. The Database management system allows so many users to access databases at the same time. Backup and recovery are ...
Read MoreCreate self-contained content in HTML5
The element in HTML5 is used to display self-contained content (images, videos, etc). This can be attached to the main program, and can be used at any place within the document without impacting the flow of document. Additionally, if we remove the tag, it won’t affect the structure of the document. Syntax The usage of tag in HTML is shown below − Image content... The parameters used in the caption are img, src and figcaption. The tag is used to specify the image source URL when we are including an ...
Read MoreWhat are different types of DBMS languages?
Once data is stored or filled it requires manipulation like insertion, deletion, updating, and modification of data. For these operations a set of languages are provided by the database management system (DBMS). So, the database languages are used to read, update and store data in the database.The different types of DBMS languages are as follows −Data Definition Language (DDL) − Create, Drop, Truncate, Rename.Data Manipulation language (DML) − Select, Insert, Delete, Update.Data Control Language (DCL) − Revoke, Grant.Transaction Control Language (TCL) − Rollback, Commit.The DBMS languages are pictorially represented as follows −Data Definition Language (DDL)It is a language that allows ...
Read MoreExplain about nested queries in DBMS
A nested query is a query that has another query embedded within it. The embedded query is called a subquery.A subquery typically appears within the WHERE clause of a query. It can sometimes appear in the FROM clause or HAVING clause.ExampleLet’s learn about nested queries with the help of an example.Find the names of employee who have regno=103The query is as follows −select E.ename from employee E where E.eid IN (select S.eid from salary S where S.regno=103);Student tableThe student table is created as follows −create table student(id number(10), name varchar2(20), classID number(10), marks varchar2(20)); Insert into student values(1, 'pinky', 3, ...
Read MoreWhat is tier-3 architecture in DBMS?
The overall design of the Database Management System (DBMS) depends on its architecture. A large amount of data on web servers, Personal Computers (PC) and other elements are linked with networks with the help of basic client or server architecture.PCs and workstations are part of Client architecture that are connected over the network. The architecture of DBMS depends on how the users are linked to the database.There are three kinds of DBMS Architecture, which are as follows −Tier-1 Architecture.Tier-2 Architecture.Tier-3 Architecture.Tier-3 ArchitectureThe 3-tier architecture contains one more layer between the client and the server.In this architecture, there is no direct ...
Read MoreWhat are the applications of DBMS?
The Database Management System (DBMS) is defined as a software system that allows the user to define, create and maintain the database and provide control access to the data.It is a collection of programs used for managing data and simultaneously it supports different types of users to create, manage, retrieve, update and store information.Applications of DBMSIn so many fields, we will use a database management system.Let’s see some of the applications where database management system uses −Railway Reservation System − The railway reservation system database plays a very important role by keeping record of ticket booking, train’s departure time and ...
Read MoreWhat are the DCL commands in DBMS?
Data control language (DCL) is used to access the stored data. It is mainly used for revoke and to grant the user the required access to a database. In the database, this language does not have the feature of rollback.It is a part of the structured query language (SQL).It helps in controlling access to information stored in a database. It complements the data manipulation language (DML) and the data definition language (DDL).It is the simplest among three commands.It provides the administrators, to remove and set database permissions to desired users as needed.These commands are employed to grant, remove and deny ...
Read MoreWhat is the purpose of Database Management System?
The Database Management System (DBMS) is defined as a software system that allows the user to define, create and maintain the database and provide control access to the data.It is a collection of programs used for managing data and simultaneously it supports different types of users to create, manage, retrieve, update and store information.PurposeThe purpose of DBMS is to transform the following −Data into information.Information into knowledge.Knowledge to the action.The diagram given below explains the process as to how the transformation of data to information to knowledge to action happens respectively in the DBMS −Previously, the database applications were built ...
Read MoreWhat are the components of DBMS?
Hardware, Software, Data, Database Access Language, Procedures and Users all together form the components of a DBMS.Let us discuss the components one by one clearly.HardwareThe hardware is the actual computer system used for keeping and accessing the database. The conventional DBMS hardware consists of secondary storage devices such as hard disks. Databases run on the range of machines from micro computers to mainframes.SoftwareSoftware is the actual DBMS between the physical database and the users of the system. All the requests from the user for accessing the database are handled by DBMS.DataIt is an important component of the database management system. ...
Read MoreWhat are different types of recoverability of schedules(DBMS)?
If any transaction that performs a dirty read operation from an uncommitted transaction and also its committed operation becomes delayed till the uncommitted transaction is either committed or rollback such type of schedules is called as Recoverable Schedules.Types of recoverable schedulesThere are three types of recoverable schedules which are explained below with relevant examples −Cascading schedulesCascadeless SchedulesStrict Schedules.The types of recoverable schedules are given below in form of a chart −Recoverable scheduleFirst, let us see an example of a recoverable schedule.T1T2R(X)W(X)W(X)R(X)commitCommitHere, transaction T2 is reading value written by transaction T1 and the commit of T2 occurs after the commit of ...
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