QUES: Sometimes it is desired to bring a database back to a previous state (for many reasons, e.g., cases when the database is found corrupted due to a software error, or if it has been updated with erroneous data). To achieve this a backup operation is done occasionally or continuously, where each desired database state (i.e., the values of its data and their embedding in database's data structures) is kept within dedicated backup files (many techniques exist to do this effectively). When this state is needed, i.e., when it is decided by a database administrator to bring the database back to this state (e.g., by specifying this state by a desired point in time when the database was in this state), these files are utilized to restore that state.

What can't be restored to a previous date?
What is the answer?
ANS: unanswerable
QUES: On 14 June 1925, in a spontaneous reaction against Primo de Rivera's dictatorship, the crowd in the stadium jeered the Royal March. As a reprisal, the ground was closed for six months and Gamper was forced to relinquish the presidency of the club. This coincided with the transition to professional football, and, in 1926, the directors of Barcelona publicly claimed, for the first time, to operate a professional football club. On 3 July 1927, the club held a second testimonial match for Paulino Alcantara, against the Spanish national team. To kick off the match, local journalist and pilot Josep Canudas dropped the ball onto the pitch from his airplane. In 1928, victory in the Spanish Cup was celebrated with a poem titled "Oda a Platko", which was written by a member of the Generation of '27, Rafael Alberti, inspired by the heroic performance of the Barcelona goalkeeper, Franz Platko. On 23 June 1929, Barcelona won the inaugural Spanish League. A year after winning the championship, on 30 July 1930, Gamper committed suicide after a period of depression brought on by personal and financial problems.

What past president of the Barcelona club committed suicide in 1930?
What is the answer?
ANS: Gamper
QUES: The Museo Torres Garcia is located in the Old Town, and exhibits Joaquin Torres Garcia's unusual portraits of historical icons and cubist paintings akin to those of Picasso and Braque. The museum was established by Manolita Pina Torres, the widow of Torres Garcia, after his death in 1949. She also set up the Garcia Torres Foundation, a private non-profit organization that organizes the paintings, drawings, original writings, archives, objects and furniture designed by the painter as well as the photographs, magazines and publications related to him.

Manolita Pina Torres was the widow of who?
What is the answer?
ANS:
Torres Garcia