Distributed Databases Replication should be used when which of the following exist? When transmission speeds and capacity in a network prohibit frequent refreshing of large tables. The application's data can be somewhat out-of-date. All of these When using many nodes with different operating systems and DBMSs and database designs. When transmission speeds and capacity in a network prohibit frequent refreshing of large tables. The application's data can be somewhat out-of-date. All of these When using many nodes with different operating systems and DBMSs and database designs. ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases Each site (or node) in a distributed system is subject to the same types of failure as in a centralized system. False True False True 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. 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 all of the rows are returned. Only the joining 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. 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 all of the rows are returned. Only the joining attributes are sent from one site to another and then only the required rows are returned. ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases With asynchronous technology, if any copy of a data item is updated anywhere on the network, the same update is immediately applied to all other copies or it is aborted. 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 An increasingly popular option for data distribution as well as for fault tolerance of any database is to store a separate copy of the database at each of two or more sites. True False True False ANSWER DOWNLOAD EXAMIANS APP
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