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Describe file organisation?
A file is organized logically as a sequence of records. These records are mapped onto disk blocks.
A) Fixed-Length Records
Type deposit=record
Accountnumber:char(10);
branch name:char(22);
balance: real;
end
B) Variable length records
a) storage of multiple record types in a file
b) Record types that allow variable lengths for one or more fields
c) Record types that allow repeating fields
d) Byte string Representation
e) Fixed length representation
Improved Reliability: In a centralised DBMS, a server failure stops the operations of the DBMS. Though, a failure at single site of a DDBMS, or a failure of a communication link cr
why we fregment at all?
write program
Flights(FlightNo, DeptDateTime, Origin, ArrivalDateTime, Destination, Capacity, SoldSeats) Tickets(FlightNo, Seat, CustID) Where - flightNo is the PK of the flights table - DeptDa
ddlc
How can we Classify the operations on classes This step fundamentally means all three models functional, object and dynamic (studied in last section) must be combined so that
what is stracture of dabms
Example: RELATIONAL SCHEMA for PERSON: PERSON (PERSON_ID: integer, NAME: string, AGE: integer, ADDRESS: String) RELATION INSTANCE In this instance, m = 3 and n = 4
What is a database graph? The partial ordering implies that the set D may now be viewed as a directed acyclic graph, known as a database graph.
Explain the θ-join and equijoin Refer tables Car and Boat which list models of cars and boats and their relevant prices. Assume a customer wants to buy a car and a boat, but sh
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