Mobile Databases: Design Issues and Challenges

Mobile databases allow the development and deployment of database applications for handheld ______

Data distribution is ______; data migrates from one fixed source to another fixed destination

Communication costs play an important role in database query ______

Mobile devices should be able to access information 24x7 from anywhere in any ______, mobile or stationary

The query optimization process requires selecting the best method of query evaluation, since it is difficult to determine the optimal location at which to send the result of the ______

Mobile databases should have transaction management capability and be able to link to networks, download data, work offline, then connect back to the network to synchronize with the ______

Connection time is the unit of monetary charge in most of cellular systems, or number of bytes/packets transferred. Energy consumption has to be limited and optimized, which implies that query processing should be ______.

Mobile devices tend to disconnect for substantial periods, where the user may still be working on the host machine and may issue queries and updates on locally cached ______.

The presence of processor mobility adds another dimension to conventional data distribution. It introduces the concept of ______.

LDD: a class of data where data values are tightly linked to a specific geographical location, i.e. 1:1 mapping between the data value set and the region it ______.

Location Dependent Query: needs LDD to ______ the result. What is the distance from the airport to here. How far is the airport now.

Location-Aware Query: it doesn’t depend on the geographical location of the query, thus, the mobility doesn’t affect its processing, i.e. What is the distance between Cairo and Alex. Location Dependent Data Distribution The 1:1 mapping between data and its geographical location restricts the three data ______ approaches.

The horizontal fragmentation and vertical fragmentation of a relational database must include the location information implicitly or ______.

The partition of database, however, becomes easier because the decision is solely based on the ______ parameter.

In a full replication, also the entire database can be replicated and used at all subdivisions in a consistent ______.

Since the distribution of LDD is dependent on geographical locations, its distribution is defined as ______ to distinguish it from the conventional temporal distribution.