Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. With the help of a suitable diagram gives module wise explanation of system architecture of DBMS.
Sol. A Database management is a collection of interrelated data and collection of programs to access that data, the data describes one particular enterprise. Database systems are ubiquitous today, and most people interact either directly or indirectly, with databases many times everyday. A major purpose of the database system is to provide users with an abstract view of the data. That is the system hides certain details of how the data are stored and maintained. Underlying the structure of a database is the data model: a collection of conceptual tools for describing data, data relationships, data is a widely used data model and it provides a convenient graphical representation to view data, relationships and constraints.
Database System Structure: A database system is partitioned into modules that deal with each of the responsibilities of the overall system. The functional components of a database system can be broadly divided into the storage manager and the query processer components. The storage manager is important because database typically require a large amount of storage space. Separate databases range is size from hundreds of gigabytes to, for the largest database terabytes of data. A gigabyte is 1000 mega bytes (1 billion bytes) and a terabyte is 1 million mega bytes (1 trillion bytes). Since main memory of computer cannot store this much information is stored on disks. Data is moved between disk storage and main memory as needed. Since the movement of data to and from disk is slow relative to the speed of the central processing unit, it is imperative that the database system structures the data so as to minimize the need to move data between disk and main memory. The query processor is important because it helps the database system simplify and facilitate access to data. High level views helps to achieve this goal; with them, users of the system are not be bounding unnecessarily with the physical details for the implementation of the database system to translate updates and queries written in a non procedural language, at the logical level, into an efficient sequence of operations at the physical level.
Components of DBMS Environment: Database management system environment's main components are as: (i) Database users and Database Administrator. (ii) Transaction Management. (iii) The query processor. (iv) Storage Manager. (v) Disk Storage. (i) Database Users: Database users can be categorized into several classes, and each class of users usually uses a different type of interface to the database. Different users are as: (A) Naïve users. (B) Application programmer. (C) Sophisticated users. (D) Specialized users. Database Administrator: One of the main reasons for using DBMS is t have central control of both the data and the programs that access those data. A person who has such central control over the system is called and Database Administrator. The functions of DBA includes: (A)Schema definition. (B)Storage structure and access method definition. (C)Schema and physical organization modification. (D)Granting of authorization for data access. (E)Routine maintenance. (ii) Transaction Management: The transaction management subsystem is responsible for ensuring that the database remains in a consistent state despite system failures. The transaction manager also ensures that concurrent transaction execution proceed without conflicting. (iii) The Query Processor: The query processor subsystem compels and executes DDL and DML statements. The query processor components include. (A) DDL interpreter. (B) DML compiler. (C) Query evaluating engine. (iv) Storage Manager: The storage manager subsystem provides the interface between the low level data stored in the database and the application programs and queries submitted to the system. The storage manager components in clues: Authorization and integrity manager. Transaction manager. File manager. Buffer manager. (v) Disk Storage: The storage implements several data structures as part of the physical system implementation. Date files. Data dictionary. Indices.
Can you help me with the following: Drop statements for all objects in the lab project. Create statements for all objects of the lab project Create indexes for foreign keys Cre
Northwind Pty Ltd sells a variety of food products throughout the world. They want to use the reporting features of SAP''s Business Information Warehouse to better understand thei
Question: This form represents one of a number used for each sailing of a range of boats. A passenger may go on many sailings and will have the same passenger number for each.
What is Normalization? Database normalization is a data design and organization method applied to data structures based on rules that help building relational databases. In rel
Unrepeatable reads : Assume T7 reads X twice during its implementation. If it did not update X itself it could be very disturbing to see a dissimilar value of X in its next read. B
Law Associates is a large legal practice based in Sydney. You have been asked to design a data model for the practice based upon the following specification: The practice emplo
Set Difference If R1 and R2 are two union compatible relations or relations then result of R3 =R1- R2 is the relation that have only those tuples that are in R1 but not in R2.
Smart Alex Catering Sevice (SACS) is a company offering top class catering staff for prestigious events. The company employs approximately 200 hourly paid contact staff - chefs,
List and also explain the dissimilar stages of DDLC ?
Explain Candidate key? Candidate Key - A candidate key is a minimal superkey, that can be used to uniquely identify a tuple in the relation.
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd