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

• Reserved space
• List representation