Podcast
Questions and Answers
Mobile databases allow the development and deployment of database applications for handheld ______
Mobile databases allow the development and deployment of database applications for handheld ______
devices
Data distribution is ______; data migrates from one fixed source to another fixed destination
Data distribution is ______; data migrates from one fixed source to another fixed destination
deterministic
Communication costs play an important role in database query ______
Communication costs play an important role in database query ______
processing
Mobile devices should be able to access information 24x7 from anywhere in any ______, mobile or stationary
Mobile devices should be able to access information 24x7 from anywhere in any ______, mobile or stationary
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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 ______
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 ______
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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 ______
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 ______
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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 ______.
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 ______.
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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 ______.
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 ______.
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The presence of processor mobility adds another dimension to conventional data distribution. It introduces the concept of ______.
The presence of processor mobility adds another dimension to conventional data distribution. It introduces the concept of ______.
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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 ______.
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 ______.
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Location Dependent Query: needs LDD to ______ the result. What is the distance from the airport to here. How far is the airport now.
Location Dependent Query: needs LDD to ______ the result. What is the distance from the airport to here. How far is the airport now.
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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.
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.
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The horizontal fragmentation and vertical fragmentation of a relational database must include the location information implicitly or ______.
The horizontal fragmentation and vertical fragmentation of a relational database must include the location information implicitly or ______.
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The partition of database, however, becomes easier because the decision is solely based on the ______ parameter.
The partition of database, however, becomes easier because the decision is solely based on the ______ parameter.
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In a full replication, also the entire database can be replicated and used at all subdivisions in a consistent ______.
In a full replication, also the entire database can be replicated and used at all subdivisions in a consistent ______.
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Since the distribution of LDD is dependent on geographical locations, its distribution is defined as ______ to distinguish it from the conventional temporal distribution.
Since the distribution of LDD is dependent on geographical locations, its distribution is defined as ______ to distinguish it from the conventional temporal distribution.
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