Database application system assignment

7/23/2016

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Database Application System Assignment

Objectives of Data Application System | Augustine Barlow

Database Application System Assignment

P1: Mission statement and Objectives of Database Application System The purpose of database application system assignment is to organize, manage and store large amounts of data in organizations.

To ensure integrity and consistency of data, database management and database application system performs some vital functions:

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Transaction Management Security Management Back up and recovery Data integrity management Multiuser Access Control Database Access Languages Data Storage Management Transaction Management : This says that, all transactions must follow ACID properties and must be completed in entirety or not started at all.

ACID stands for Atomicity, Consistency, Isolation and Durability.

Atomicity: All tasks of the transaction must be performed or transaction must not be started at all, this means that a transaction must not remain in incomplete state otherwise it will make database incorrect.

Consistency: The database must remain in consistent state before the transaction starts and after the transaction is over, whether the transaction is successful or not. This implies that a database must show value which is a whole number, it must not be in fractions.

Isolation: Two transaction, occurring simultaneously in a system cannot access or view each other at a time. This implies, that transactions cannot are not accessible in intermediate state. This is required to maintain consistency in database.

Durability: When the transaction gets completed successfully, the results must persist and not get undone by any kind of disaster like natural calamity or system crash.

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Security Management: Only authorized users who have proper login credentials can access the database.

This is important to safeguard database against malicious and unidentified access.

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Back up and recovery: This measure is required to protect the database in case of persistent problems like power outage. Backup and Recovery function of database ensures that how long the database management system takes to bring back the system in its original state.

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Data integrity management: To reduce data redundancy and maximize data consistency is the rule that is enforced by database application system, ensuring that resulting database returns same answers that is intended.

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Multiuser Access Control : Without affecting the integrity and consistency of the database, the ability of multiple users to access the database at same time.

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Database Access Languages : A non-procedural language like SQL is used which gives the facility to easily manage the database transactions like insertion, deletion, updation of database. It is simple and can be learnt by naïve users easily.

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Data Storage Management or data dictionary management: When any data is requested by end user it is fetched from database management system or DBMS. DBMS removes the data and structural dependency and provides end user with abstracted version of data, which is lot easier to read, understand and implement.

The objective of database application system is to serve as an organized means of keeping track of database like Wellmeadows Hospital.

Mission and Objectives of Wellmeadows Hospital Mission statement : To provide cost effective and accessible healthcare services all over United Kingdom.

Objective statement : To provide world’s best healthcare services to elderly people, treating illness in compassionate way.

The database application system will allow the end users to search various entities and their corresponding relationship.

This database will enhance proper functioning of hospital, and will help hospital staff to keep track of various activities easily.

This will also allow to develop an organized check-in and check-out system and help to keep a check on various staff members, patients and doctors. Also see Features of Database Management System.

A centralized database will ease the work of patients, doctors, and all hospital staff members, to check various transactions, hospital supplies, inpatient and outpatient status, and attendance of various members of staff.

P2: ER Diagram for Wellmeadows Hospital :

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Above ER Diagram for Wellmeadows hospital shows following operations:

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Suppliers supply Wellmeadows Hospital with pharmaceutical, surgical and non-surgical supplies.

Hospital has a medical officer who manages various supplies (pharmaceutical, surgical and non-surgical) Hospital has a personnel officer who particularly looks towards staff and its operations.

Staff has hospital consultants and charge nurses etc.

Patients take appointments via hospital consultants.

Doctors treat patients and prescribe medication.

Patients can be inpatient or outpatient.

There are wards in the hospital which has respective staff.

P3: Relational Database for Wellmeadows Hospital We will discuss relational database for Wellmeadows Hospital. The tables with their respective attributes and constraints are as follows:

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Table

Attribute

Constraints

Supplier

Supp_id

Primary Key

Supp_name

Supp_street

Supp_city

Supp_phone

Supp_fax_no

Staff

Staff_id

Primary Key

Staff_fname

Staff_lname

Staff_street

Staff_city

Staff_dob

Staff_gender

Staff_nin

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Staff_phone

Staff_salary_scale

Staff_salary

Staff_position

Staff_work_exp_start_date

Staff_work_exp_end_date

Staff_org_name

Staff_date_of_qualification

Staff_qualification_type

Staff_institution_name

Staff_employment_contract

Doctor

Doc_id

Primary Key

Doc_fname

Doc_lname

Doc_clinic_no

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Doc_street

Doc_city

Doc_phone

Patient

Pat_id

Pat_fname

Primary Key

Pat-lname

Pat_street

Pat_city

Pat_registration_date

Pat_dob

Pat_gender

Pat_appointment_no

Pat_next_of_kin_fname

Pat_next_of_kin_lname

Pat_next_of_kin_relationship

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Pat_next_of_kin_phone

Medication

Bill_no

Primary Key

Pat_fname

Foreign Key

Pat_lname

Foreign Key

Pat_street

Pat_city

Drug_id

Drug_name

Med_Start_date

Med_end_date

Unit_per_day

Method_of_adm

Ward

Ward_id

Primary Key

Ward_name

Location

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No_of_beds

Phone_ext_no

Pharmaceutical Supplies

Drug_id

Primary Key

Drug_name

Drug_desc

Reorder_level

Cost_per_unit

Drug_dosage

Method_of_administration

Quantity_in_stock

Non_surgical_supplies

Non_surgical_supplies_id

Primary Key

Non_surgical_supplies_name

Non_surgical_supplies_desc

Quantity_in_stock

Reorder_level

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Requisition_Form

Requisition_form_id

Primary Key

Drug_id

Foreign Key

Drug_name

Drug_desc

Cost_per_unit

Drug_dosage

Date_of_ordering_drug

Method_of_administration

Drug_quantity_required

Ward_id

Ward_name

Staff_id

Foreign Key

Staff_name

Read about Catering Database Management.

Relationships between various entities: The relationships and corresponding entities with cardinality constraints are as follows:

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Relationship

Entity 1

Entity 2

Cardinality

Supplies

Charge Nurse

Requisition_form

1:N

Supplied by

Supplier

Supplies

M:N

Gives appointment

Hospital consultant

patient

1:N

Treated by

Patient

Doctor

N:1

Prescribe

Doctor

Medication

1:N

Manages

Personnel officer

Staff

1:N

Manages

Medical officer

Staff

1:N

Manages

Medical officer

Bed

1:N

Manages

Medical officer

Supplies

1:N

Has

Hospital

Medical officer

1:1

Has

Hospital

Personnel officer

1:1

Has

Staff

Ward

M:N

References :  

Generalization, Specialization and Aggregation [Online]. [Accessed on 25 November 2014]. Available on world wide web: <http://www.studytonight.com/dbms/generalization-and-specialization.php> Entity Relationship Modeling [Online]. [Accessed on 25 November 2014]. Available on world wide web: <http://www.databasedesign.co.uk/bookdatabasesafirstcourse/chap3/chap3.htm>

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DBMS Functions- Database Management [Online]. [Accessed on 25 November 2014]. Available on world wide web: <http://databasemanagement.wikia.com/wiki/DBMS_Functions> Introduction to database systems [Online]. [Accessed on 25 November 2014]. Available on world wide web: <http://www.cse.buffalo.edu/~bina/cse462/lectures/lec1/sld001.htm> What is Database Management System [Online]. [Accessed on 25 November 2014]. Available on world wide web: <http://education-portal.com/academy/lesson/what-is-a-database-management-system-purpose-andfunction.html> Database ACID properties [Online]. [Accessed on 26 November 2014]. Available on world wide web: <http://www.lightwolftech.com/index.php?page=backgrounders>

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