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Objectives
After reading this part, you should be able to:
explain exhaustively the problems associated with ER diagrams. include illustrations in your answer
What are the storage types? The storage types are: a) Volatile storage b) Nonvolatile storage
let us consider a table having 2200 records and the fixed size of the table to be considered as 25.then how many numbers of table is requredto perform horizontal fragmentation
Explain Network Model in DBMS? Network Model - It was formalised within the late year of 1960s through the Database Task Group of the Conference on Data System Language (DBTG
Describe the four main ways of optimising disk block access. Ans: a. Disk b. Non-volatile writes buffers c. File organization (Clustering) d. Log-based file system
What is a data dictionary? A data dictionary is a data structure which keeps Meta data about the structure of the database i.e. the schema of the database.
#what is cursor its uses ? Explain it
What are the ways in which the variable-length records arise in database systems? Storage of many record types in a file. Record types that permit variable lengths for one o
triggering
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
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