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File Organisation In Dbms
Introduction
Databases are used to store information. Usually, the principal operations we have to perform on database are those relating to:
We have seen that in terms of the logical operations to be done on the data, relational tables give a good mechanism for the entire over tasks. Thus the storage of a database in a computer memory (on the hard disk, of course), is mainly concerned with the following issues:
We shall see that the point (iii) between these observations is quite needful. Databases are used to store information in the form of files of records and are typically stored on magnetic disks. This section focuses on the file Organisation in DBMS, the access methods available and the system parameters related with them. File Organisation is the way the files are in order on the disk and access method is how the data can be retrieved based on the file Organisation.
Explain the differences between structured data and unstructured data. Structured data are facts concerning objects and events. The most significant structured data are numeric
Let consider the given partial relation EMP. Let us make some sub-queries for them EMPNO ENAME JOB SAL DEPTNO 7566
.#question. Discuss the problem which may arise during concurrency control and recovery in distributed database which are not encountered in controlized database environment.
Define entity integrity and referential integrity. How does SQL allow specification of these? Ans: Entity Integrity Rule- If the attribute A of relation R is a prime attribut
List some instances of collection types? a) sets b) arrays c) multisets
explain in detail about time stamp orderting/
Discuss The difference between drop table R and delete from R. DROP TABLE command deletes all the records with the table definition. This command will automatically committed
Define the Boyce-Codd Normal Form with instance and also Compare BCNF and 3NF. Ans: BCNF: For each functional dependency X->Y in a set F of functional dependencies over relati
write-set(T): Each data items that are written by a transaction T
Consider a typical sales invoice that would include the following information. Design a single table to hold all of the information required to store an invoice including this info
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