The username and password for the database in the configuration file of a web application is incorrect, so the web application cannot connect to the database. Which failure scenario best describes this example? Storage media failure Transaction failure System failure Task failure

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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The username and password for the database in the configuration file of a web
application is incorrect, so the web application cannot connect to the database.
Which failure scenario best describes this example?
Storage media failure
Transaction failure
System failure
Task failure
Transcribed Image Text:The username and password for the database in the configuration file of a web application is incorrect, so the web application cannot connect to the database. Which failure scenario best describes this example? Storage media failure Transaction failure System failure Task failure
Choose the recovery log that is generated by the schedule below.
T1
T2
read B
read C
A = B + 1
write A
commit
B = C- 2
write B
rollback
1. start T12. update T1, AID, Aoriginal, Anew3. start T24. commit T15. update
T2, BID, Boriginal, Bnew6. undo T2, BID, Boriginal7. rollback T2
1. start T12. start T23. update T1, AID, Aoriginal, Anew4. update T2, BID,
Boriginal, Bnew5. undo T2, BID, Boriginal6. commit T17. rollback T2
1. start T12. update T1, AID, Aoriginal, Anew3. start T24. update T2, BID,
Boriginal, Bnew5. undo T2, BID, Boriginal6. commit T17. rollback T2
1. start T12. start T23. update T1, AID, Aoriginal, Anew4. commit T15. update
T2, BID, Boriginal, Bnew6. undo T2, BID, Boriginal7. rollback T2
Transcribed Image Text:Choose the recovery log that is generated by the schedule below. T1 T2 read B read C A = B + 1 write A commit B = C- 2 write B rollback 1. start T12. update T1, AID, Aoriginal, Anew3. start T24. commit T15. update T2, BID, Boriginal, Bnew6. undo T2, BID, Boriginal7. rollback T2 1. start T12. start T23. update T1, AID, Aoriginal, Anew4. update T2, BID, Boriginal, Bnew5. undo T2, BID, Boriginal6. commit T17. rollback T2 1. start T12. update T1, AID, Aoriginal, Anew3. start T24. update T2, BID, Boriginal, Bnew5. undo T2, BID, Boriginal6. commit T17. rollback T2 1. start T12. start T23. update T1, AID, Aoriginal, Anew4. commit T15. update T2, BID, Boriginal, Bnew6. undo T2, BID, Boriginal7. rollback T2
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