1 Data model: OODBMS vs. RDBMS
For this coursework two kinds of data models can be used. The object oriented data model, Object Oriented Database Management System(OODBMS), or the relational data model, Relational Database Management System(RDBMS). The differences between these two models and the data model to be used are described in this chapter.
1.1 Enumeration of some specifications of OODBMS and RDBMS
RDBMS have been around for more than 20 years, OODBMS are relatively new;
RDBMS can handle >10.000.000.000 records, OODBMS up to 10.000.000.
OODBM is good for storing complex descriptions (e.g., a plant schematic), RDMSs appropriate for simple, “flat” data.
RDBMS control the DB market (>90%), OODBMS own <5% of the market.
The relational model, as implemented in most RDBMSs, can represent a lot of different models, but has difficulty representing inheritance hierarchies, and complex relationships (many many-to-many's) are costly to process
1.2 Advantages of an OODBMS
1. Composite Objects and Relationships: Objects in an OODBMS can store an arbitrary number of atomic types as well as other objects. It is thus possible to have a large class which holds many medium sized classes which themselves hold many smaller classes, ad infinitum. In a relational database this has to be done either by having one huge table with lots of null fields or via a number of smaller, normalized tables which are linked via foreign keys. Having lots of smaller tables is still a problem since a join has to be performed every time one wants to query data based on the "Has-a" relationship between the entities. Also an object is a better model of the real world entity than the relational tuples with regards to complex objects. The fact that an OODBMS is better suited to handling complex,interrelated data than an RDBMS means that an OODBMS can outperform an RDBMS by ten to a thousand times depending on the complexity of the data being handled.
2. Class Hierarchy: Data in the real world is usually has hierarchical characteristics. The ever popular Employee example used in most RDBMS texts is easier to describe in an OODBMS than in an RDBMS. An Employee can be a Manager or not, this is usually done in an RDBMS by having a type identifier field or creating another table which uses foreign keys to indicate the relationship between Managers and Employees. In an OODBMS, the Employee class is simply a parent class of the Manager class.
3. Circumventing the Need for a Query Language: A query language is not necessary for accessing data from an OODBMS unlike an RDBMS since interaction with the database is done by transparently accessing objects.
OCF created two relational databases to support data provisioning —one to support transaction processing and another to support information delivery.
Microsoft Access is a database engine and development environment in one package. It is typically workstation-based, and designed to be easy to use, even for users with no experience. However, it also provides advanced functionality for experienced users. MySQL is the largest open-source RDMBS, and it is server-based, as well as the rest of the DBMS that will be discussed. According to the mysql.com website, it offers high reliability and performance, easy use and deployment, freedom from platform lock-in by providing ready access to source code, and cross-platform support. SQL Server is an enterprise class RDBMS from Microsoft. It is part of the Back Office Suite of products. Although it is always server-based in production, it can be client-based in development. DB2 is also an enterprise-class DBMS, produced by IBM. It offers some object-oriented functionality, as well as cross-platform compatibility, and is server-based. Finally, Oracle offers much of the same functionality as DB2, with cross-platform capability, and some object-oriented features. It, as well, is server-based.
From the scenario described above, I have determined that the following main entities are the most appropriate for a relational database: cemeteries, burial plots, burial records, monuments, buildings, and inscriptions. Each main entity and its significant attributes will be described below; however, a full list of attributes can be found in the appendix.
Object Oriented database models approach from the opposite direction (a programming language itself) to solve the problem of handling complex data types.
[7] Elmasri & Navathe. Fundamentals of database systems, 4th edition. Addison-Wesley, Redwood City, CA. 2004.
Relation databases have a fraught connection with applications written in object-oriented programming languages like Java, PHP, and Python. NoSQL databases are more likely to ide-step this conflict through APIs, which enables developers to eliminate questions without having to understand or learn the repressed architecture of their database system.
The following diagram illustrates the structure of a typical application which accesses persistent data stored in a relational database. The data logic and JDBC API are embedded to some degree within the business logic, tightly coupling the two layers together.
Oracle is another database management system and it is one of the best. Oracle database management system was set up by the “Oracle Corporation”. Oracle Corporation is an American based computer technology corportation. In 1977, Software Development Laboratories (SDL) was set up by Larry Ellison, Bob Miner and Ed Oates. This consultancy then developed the original version of the Oracle software. “Oracle” comes from the code name of a project that Ellison had worked on a few years previous. The Oracle Relational Database Management system or Oracle RDBMS for short has had some clients find it difficult to install on Linux systems. Unlike MySQL, Oracle is not open source and can become quite pricey when dealing with a lot of database materials. Oracle would not be my first choice of RDBMS.
"Although fully searchable text could, in theory, be retrieved without much metadata in the future, it is hard to imagine how a complex or multimedia digital object that goes into storage of any kind could ever survive, let alone be discovered and used, if it were not accompanied by good metadata" (Abby Smith). Discuss Smith's assertion in the context of the contemporary information environment
There are various terms that are associated with Enterprise Data Management. Some of these terms are UML, OLAP, OLTP, Data Warehouse, Data Mart and Multi-Tier Architecture. Subsequently, these terms were covered during the five week course of DMB405 and will be explained in further detail throughout the course of the paper. Although the paper will not be all inclusive to the detail of each term, it will touch upon the definition, their use and their place in Enterprise Data Management. The first term that will be discussed is UML and how it relates to the subject at hand.
A database is a structured collection of data. Data refers to the characteristics of people, things, and events. Oracle stores each data item in its own field. For example, a person's first name, date of birth, and their postal code are each stored in separate fields. The name of a field usually reflects...
Secondly is a DBMS as a storage management that create a structured required from a complex data. This way will avoid us from having a difficult way to define and programmes the information data characteristics. DBMS consist of modern DBMS that provide another function in deep compared to the common DBMS. This modern DBMS will also include related data foe entry form, or screen definitions, report definitions, data validation rules, procedural code, structures to handle video and picture formats,
There are many different types of databases, different performances of databases, and different database software functions. Before we get to much into databases lets take a step back and think about what a database really is and how they are applied. A database is a software program arranged to collect hold and process information. There are quite a bit of software programs out there already that can allow you to do all this. However, what makes databases different is that once you enter information in to, the database will operate the information in ways that allow you to analyze the information. Databases are designed in such a way that as to make it easier to obtain particular pieces of data. Databases are used in many ways existing in pretty much the entire world of computers. Databases are the most used method of storage for large multiuser funtions where the coordination between many users is necessary. This is just basically what a database is.
Many users find it easier to install, implement and use MySQL than other RDBMS. The developers can easily install MySQL without dealing with complex configurations. At the same time, they can use a number of third-party tools to implement the database according to their requirements. Each programmer familiar with Structured Query Language (SQL) can further use the database without any hassle.
In database system, main data structure used in relational tables with well define values for each row and column.