Slide 16.3: Quadrant 3: complex data without queries

A DBMS Classification Matrix (Cont.)

	Simple Data	Complex Data
Query	2. Relational DBMS	4. Object-Relational DBMS
No Query	1. File System	3. Persistent Language

Quadrant 3: Complex Data without Queries

Persistent language is a language where created objects and variables continue to exist and retain their values between runs of the program.

Open floor plan example

For employee table records the employee‘.s name, current cubicle location (space), and the set of all other employees who share a common cubicle wall with the employee (adjacency).

1CREATE TABLE  employee (
2  name       VARCHAR(30),
3  space      polygon,
4  adjacency  SET-OF( employee ) );

1CREATE TABLE  floors (
2  number  INTEGER,
3  asf     swiss_cheese_polygon );

For floors table records the floor number and the amount of assignable square feet (asf).

The program reads all employee records to ascertain current spaces for employees, and it gets the asf of each floor.

The compaction routine generates a revised allocation of employees into the asf of each floor. When compaction is complete, each employee record must be written with a new space allocation.

1main( ) {
2  read all employees;
3  read all floors;
4  compact( );
5  write all employees; 
6}