The following is a sequence of undo-log records written by two transactions T and U: < START T>; ; < START U>; ; ; ; ; < T ,E , 50>; . Describe the action of the recovery manager, including changes to both disk and the log, if there is a crash and the last log record to appear on disk is:

Giving that: The following is a sequence of undo-log records written by 2 transactions T and U:

< START T >;

< T,A,10 >;

< START U >;

< U, B, 20 >;

< T, C, 30 >;

< U, D, 40 >;

< Commit U >;

< T, E, 50 >;

< Commit T >;

1. < START U >

      Recovery action in this case will be undo(-1) and undo(0). All restored to its original Value

     log records < T, A, 10 >,  < T, abort >; as written out

2. < T, E, 50 >

      Recovery action in this case will be undo(8) and redo(0). A and C is restored to its original value, B and D are set to 20 and 40

      log records <T, C, 30 >,  < T, A, 10 >,  < T, abort >  are written out

3. < Commit T >

      Recovery action in this case will be redo(7) and redo(4). A and C are set to 10 and 30, B and D are set to 20 and 40

continuous information you receive.

a  social news website  is an  internet  website  that features  user-posted stories. such stories are ranked based on popularity, as voted on by other users of the site or by website administrators. users typically comment online on the news posts and these comments may also be ranked in popularity. since their emergence with the birth of  web 2.0, social news sites have been used to link many types of information, including news, humor, support, and discussion. all such websites allow the users to submit content and each site differs in how the content is moderated. on the  slashdot  and  fark  websites,  administrators  decide which articles are selected for the front page. on  reddit  and  digg, the articles that get the most votes from the community of users will make it to the front page. many social news websites also feature an online comment system, where users discuss the issues raised in an article. some of these sites have also applied their voting system to the comments, so that the most popular comments are displayed first. some social news websites also have a  social networking  function, in that users can set up a user profile and follow other users' online activity on the website.