Wellmeadows Hospital Case Study Er Diagram Online

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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:

  • 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.

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

Above ER Diagram for Wellmeadows hospital shows following operations:

  • 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:

SupplierSupp_idPrimary Key
StaffStaff_idPrimary Key
DoctorDoc_idPrimary Key
PatientPat_idPrimary Key
MedicationBill_noPrimary Key
Pat_fnameForeign Key
Pat_lnameForeign Key
WardWard_idPrimary Key
Pharmaceutical SuppliesDrug_idPrimary Key
Non_surgical_suppliesNon_surgical_supplies_idPrimary Key
Requisition_FormRequisition_form_idPrimary Key
Drug_idForeign Key
Staff_idForeign Key

Read about Catering Database Management.

Relationships between various entities:

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

RelationshipEntity 1Entity 2Cardinality
SuppliesCharge NurseRequisition_form1:N
Supplied bySupplierSuppliesM:N
Gives appointmentHospital consultantpatient1:N
Treated byPatientDoctorN:1
ManagesPersonnel officerStaff1:N
ManagesMedical officerStaff1:N
ManagesMedical officerBed1:N
ManagesMedical officerSupplies1:N
HasHospitalMedical officer1:1
HasHospitalPersonnel officer1:1

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>
  • 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-and-function.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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