Computers and Technology, 17.12.2019 21:31 babygreg2001p97abr

Consider the log shown below.

lsn log
00 update: t1 writes p3
10 update: t1 writes p1
20 update: t1 writes p2
30 update: t2 writes p3
40 begin checkpoint
45 end checkpoint
50 update: t3 writes p4
60 t1 commit
70 update: t3 writes p2
80 t1 end
90 update: t2 writes p1
100 t2 commit crash, restart
in this log, we store information about 3 transactions. after the log record with lsn 100, the system crashes and then we restart. we use the aries recovery algorithm discussed in chapter 18 in the book. based on that, answer the following questions:

1. what is done during the analysis phase?
2. what is done during the redo phase?
3. what is done during the undo phase?
4. show the log when recovery is complete, including all non-null prevlsn and undonextlsn values in log records.

Answers: 2

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Consider the log shown below.

lsn log
00 update: t1 writes p3
10 update:...

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