What are the Constituents of File? Also elaborates all the possible file operations?
A file is organised logically as sequence of record. These records are mapped onto disk blocks. Although blocks are of fixed size denoted through the physical properties of the disk and through the operating system, record sizes vary. In a relational database, tuples of distinct relations are commonly of different sizes.
Possible operations on a file:
(i) Create: a file can be created
(ii) Delete: a file can be deleted
(iii) Changing attributes of a file: The attributes of a file say read only, author's name etc. can be changed.
(iv) Contents of the file can be altered.