What difference does checkpointing makes in log based recovery?


This is more of a big data question(GFS related). I'm not getting how checkpointing help? Can you share 1 example(which could be DBMS example).

Say these are the operations on the database.

Time| Operations

0 start T1

1 read A

2 write B=B+20

3 read B

4 write A=A+40

5 Commit T1

6 start T2

7 write C=C+A

8 Write A=A+B

9 Read B

10 Commit T2

I don't get what checkpointing helps in replaying effort here? Can you clarify me?


Asked by:- shivajikobardan
0
: 50 At:- 7/23/2022 1:47:51 AM
big data Google File System







1 Answers
profileImage Answered by:- vikas_jk

Checkpoint in dbms can be considered same we create restore point In Windows backup.

Suppose we have checkpoint1 and we want to execute some query and create checkpoint2

then if something goes wrong after creating checkpoint2, we can rollback changes back to the changes and go back to checkpoint1 again.

You can also refer

https://www.cs.uic.edu/~ajayk/Checkpointing.pdf

https://www.csee.umbc.edu/courses/461/current/burt/lectures/lec25/recovery.html (Check log based recovery)

0
At:- 7/23/2022 7:44:37 AM






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