Distributed Databases A distributed database is which of the following? A loose collection of file that is spread to multiple locations and is interconnected by a network A single logical database that is limited to one location. A loose collection of file that is limited to one location. A single logical database that is spread to multiple locations and is interconnected by a network A loose collection of file that is spread to multiple locations and is interconnected by a network A single logical database that is limited to one location. A loose collection of file that is limited to one location. A single logical database that is spread to multiple locations and is interconnected by a network ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases Data replication is favored where most process requests are read-only and where the data are relatively static. True False True False ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases Which of the following is a disadvantage of replication? If the database fails at one site, a copy can be located at another site. Each transaction may proceed without coordination across the network. Each site must have the same storage capacity. Reduced network traffic If the database fails at one site, a copy can be located at another site. Each transaction may proceed without coordination across the network. Each site must have the same storage capacity. Reduced network traffic ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases A semijoin is which of the following? All of the attributes are sent from one site to another and then only the required rows are returned. Only the joining attributes are sent from one site to another and then only the required rows are returned. Only the joining attributes are sent from one site to another and then all of the rows are returned. All of the attributes are sent from one site to another and then only the required rows are returned. All of the attributes are sent from one site to another and then only the required rows are returned. Only the joining attributes are sent from one site to another and then only the required rows are returned. Only the joining attributes are sent from one site to another and then all of the rows are returned. All of the attributes are sent from one site to another and then only the required rows are returned. ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases With failure transparency, all of the actions of a transaction are committed or none of them are committed. True False True False ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases A transaction manager is which of the following? Maintains appropriate concurrency control Maintains a log of transactions Maintains before and after database images All of these Maintains appropriate concurrency control Maintains a log of transactions Maintains before and after database images All of these ANSWER DOWNLOAD EXAMIANS APP
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