Distributed Databases Asynchronous technology can result in unsatisfactorily slow response time because the distributed DBMS is spending considerable time checking that an update is accurately and completely propagated across the network. False True False True ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases Some of the columns of a relation are at different sites is which of the following? Data Replication Horizontal Partitioning Vertical Partitioning Horizontal and Vertical Partitioning Data Replication Horizontal Partitioning Vertical Partitioning Horizontal and Vertical Partitioning ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases A transaction manager is which of the following? Maintains before and after database images All of these Maintains a log of transactions Maintains appropriate concurrency control Maintains before and after database images All of these Maintains a log of transactions Maintains appropriate concurrency control ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases A heterogeneous distributed database is which of the following? The same DBMS is used at each location and data are not distributed across all nodes. The same DBMS is used at each location and data are distributed across all nodes. A different DBMS is used at each location and data are not distributed across all nodes. A different DBMS is used at each location and data are distributed across all nodes. The same DBMS is used at each location and data are not distributed across all nodes. The same DBMS is used at each location and data are distributed across all nodes. A different DBMS is used at each location and data are not distributed across all nodes. A different DBMS is used at each location and data are distributed across all nodes. 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 An autonomous homogenous environment is which of the following? The same DBMS is at each node and each DBMS works independently. A different DBMS is at each node and each DBMS works independently. The same DBMS is at each node and a central DBMS coordinates database access. A different DBMS is at each node and a central DBMS coordinates database access. The same DBMS is at each node and each DBMS works independently. A different DBMS is at each node and each DBMS works independently. The same DBMS is at each node and a central DBMS coordinates database access. A different DBMS is at each node and a central DBMS coordinates database access. ANSWER DOWNLOAD EXAMIANS APP
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