Distributed Databases A transaction manager is which of the following? Maintains a log of transactions All of these Maintains before and after database images Maintains appropriate concurrency control Maintains a log of transactions All of these Maintains before and after database images Maintains appropriate concurrency control ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases Data replication is favored where most process requests are read-only and where the data are relatively static. False True False True ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases Synchronization for pull replication is less disruptive and occurs only when needed by each site, not when a central master site thinks it is best to update. False True False True ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases In a semijoin, only the joining attribute is sent from one site to another, and then only the required rows are returned. True False True False ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases The purpose of timestamping is to avoid the use of locks. False True False True ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases A distributed database has which of the following advantages over a centralized database? Slow Response Modular growth Software complexity Software cost Slow Response Modular growth Software complexity Software cost ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS