Distributed Databases A semijoin is which of the following? 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. 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 Which of the following is not one of the stages in the evolution of distributed DBMS? Distributed request Unit of work Distributed unit of Work Remote unit of work Distributed request Unit of work Distributed unit of Work Remote unit of work ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases Which of the following is a disadvantage of replication? Each transaction may proceed without coordination across the network. Each site must have the same storage capacity. If the database fails at one site, a copy can be located at another site. Reduced network traffic Each transaction may proceed without coordination across the network. Each site must have the same storage capacity. If the database fails at one site, a copy can be located at another site. Reduced network traffic ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases Replication should be used when which of the following exist? When using many nodes with different operating systems and DBMSs and database designs. All of these When transmission speeds and capacity in a network prohibit frequent refreshing of large tables. The application's data can be somewhat out-of-date. When using many nodes with different operating systems and DBMSs and database designs. All of these When transmission speeds and capacity in a network prohibit frequent refreshing of large tables. The application's data can be somewhat out-of-date. ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases A distributed unit of work allows various statements within a unit of work to refer to multiple remote DBMS locations. False True False True ANSWER DOWNLOAD EXAMIANS APP
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