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. False True False True ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases Which of the following is true concerning a global transaction? The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary. The required data are located in at least one nonlocal site and the distributed DBMS passes the request to only the local DBMS. The required data are at one local site and the distributed DBMS passes the request to only the local DBMS. The required data are at one local site and the distributed DBMS routes requests as necessary. The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary. The required data are located in at least one nonlocal site and the distributed DBMS passes the request to only the local DBMS. The required data are at one local site and the distributed DBMS passes the request to only the local DBMS. The required data are at one local site and the distributed DBMS routes requests as necessary. ANSWER DOWNLOAD EXAMIANS APP
Distributed Databases Which of the following is not one of the stages in the evolution of distributed DBMS? Distributed request Remote unit of work Distributed unit of Work Unit of work Distributed request Remote unit of work Distributed unit of Work Unit of work 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 The cost to perform a snapshot refresh may depend on whether the snapshot is simple or complex. 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. True False True False ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS