The design and purpose
Some aspects should be considered with a view to achieving the development of mobile system databases or MDS. Performance must be stabilized through mobility. Design of MDS should be Unobtrusive interface. MDS is reliable to fulfill the high expectations of users of mobile phones. Finally the scalability of MDS-includes these, everyone will synchronize at the same time. Merge replication to synchronize a local DATABASE, the database that resides on the mobile device with the central database on the server.Determine how you want the data to be imported or exported driving database on the server as part of the database synchronization strategy planning phase database design
Mobile database structure
Mobile database design is base on the eightfold. specific measures will help design the MDS will be successful. In Figure 1 below shows the flow of eight steps develop mobile database.
1. mobile platform
Factors to be considered when selecting the platform include, ease of use, ease of development, ease of communication, ease of deployment, product price, reliability, maintainability, message throughput, technical support and popularity of the product. You must also give reasons which wireless technology and network available for use in mobile applications.For example mobile operating system is the best for the proper deployment of MDS?Current available mobile PC and laptop operating systems include Windows 2003/XP/Vista/7, Windows Mobile and PocketPC 7.x or 8.x-9.x Symbian OS, Linux and Embedded Linux.
2. Mobile database
After selecting the platform of a mobile management database will be selected at this time if the database supports mobile on a mobile platform that you selected previously are inadequate, and then you may want to choose another mobile database or change to another mobile platform, for example, the IBM DB2 Everyplace and Oracle9i Lite.Oracle Database Lite provides small footprint, SQL-database for the local client access enterprise applications on a mobile device also has a mobile server middleware component that supports scalable synchronization and centralized Office mobile resources
3. the central database
The choice of a central database is parallel with the choice of mobile database because the database, you must work together in a single system during communication, for example if you are using SQL Server for Windows Mobile, mobile database, SQL Server can be used as a central database to be compatible, because both database systems management from the same vendor.
4. transaction Model
Model of the transaction should be chosen depending on the characteristics and preferences of the user.Transaction Names among models are available in a mobile environment, PRO-MOTION, kangaroos, Moflex, clustering, and Multi-Database.
5. Optimization techniques
Compression method provides the ability to move large amounts of data between a mobile device and the server is a central database.Compression method will make the best use of bandwidth, data sent between mobile devices and a central database; this will not only improve performance but will also do bandwidth for other users of mobile devices with limited storage of frequently used data to be stored for the optimal use of available disk space.
6. the database entities
Identity database and data is critical since infrastructure relevant decisions, decisions must be made to store data.
7. an entity attributes
Although it identifies the database entities, attributes that are contained in each of these entities will be considered for each of these attributes, data type and size of the data must also be defined.
8. an entity relationship diagram
After the database entities and their attributes schema entities to develop relationship. the scheme will provide the relationship between the various offices.
The process of designing a database is the most important part of this phase involves a series of important decisions and above steps mentioned earlier plays a vital role in the development of successful MDS.
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