5 votes 5 votes Which of the following contains complete record of all activity that affected the contents of a database during a certain period of time? Transaction log Query language Report writer Data manipulation language Databases isro2009 databases transaction-and-concurrency + – go_editor asked Jun 15, 2016 • edited Dec 4, 2022 by Lakshman Bhaiya go_editor 5.7k views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
Best answer 7 votes 7 votes a) Transaction Log A "transaction log" is a history of actions executed by a DBMS to guarantee "ACID" properties over crashes or hardware failures. Physically a log is a file listing changes to the DB, stored in a stable storage format. Devshree Dubey answered Jun 15, 2016 • selected Jun 24, 2016 by Anu Devshree Dubey comment Share Follow See all 0 reply Please log in or register to add a comment.
2 votes 2 votes ans is (a) a transaction log is a history of actions executed by adatabase management system to guarantee ACID properties over crashes or hardware failures. Physically, a log is a file listing changes to the database, stored in a stable storage format. If, after a start, the database is found in an inconsistent state or not been shut down properly, the database management system reviews the database logs foruncommitted transactions and rolls back the changes made by these transactions. Additionally, all transactions that are already committed but whose changes were not yet materialized in the database are re-applied. Both are done to ensure atomicity and durability of transactions. kvkumar answered Jun 25, 2016 kvkumar comment Share Follow See all 0 reply Please log in or register to add a comment.
