I Bcom Notes

I Bcom(CA) Notes 


DBMS Notes



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DBMS Notes

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  CHAPTER-1 INTRODUCATION TO DBMS System A system is an integration of entities, alternatively designed as components, which have integration among them. For E.g., consider a particular department in a college (or) university. The entities of the department are students, non-teaching staff, infrastructure etc. These entities interact with another.           The information system can be either a conventional file processing system (or) database management system. Explain the Conventional File Processing System:           In the conventional File Processing System each and every sub system of the information system will have own set of files. As a result there will be a duplication of data between various sub systems.           The concept of Conventional File Processing System is shown below. The above system consists of 3 sub-syste...
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I Bcom(CA) _ 2021 Notes

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  Q: What is Computer? Ans:    Computer is an electronic device which can  transforms   data .   Data   can   b e anything    like   m arks   obtained   in   various subjects.   It   can   also   be   na m e,   age, sex, weight, height, etc. of all the students in class. Co m p uter   can   be   defined   in   ter m s   of   its   functions. It can i) accept data ii)  s to r e data, iii) process data as desire d , and iv) retrieve t h e stored data as and when required and v) pri n t the  r esult in de s i r ed  f or m at. Q: What are charac t eristic  o f c o mputer? Ans: 1.   Speed:   -  As   we   know   co m puter   can   work   very   fast.   It   takes   only   few seconds for   calc u lations   that   we   take   ho u rs   to...
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