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Consider the recovery scenario described in the following, in which we use the ARIES recovery algorithm. At the beginning of time, there are no...
Consider the recovery scenario described in the following, in which we use the ARIES recovery
algorithm. At the beginning of time, there are no transactions active in the system and no dirty pages. Acheckpoint is taken. After that, three transactions, T1, T2, and T3, enter the system and perform variousoperations. The system experiences a crash, and during recovery, the system experiences another crash.The detailed log follows:LOGLSN PREV_LSN TRAN_ID TYPE PAGE_ID--- -------- ------- ----- --------1 - - begin CKPT -2 - - end CKPT -3 NULL T1 update P54 NULL T2 update P25 NULL T3 update P76 5 T3 update P57 3 T1 update P78 4 T2 update P39 7 T1 commit -10 6 T3 abort -11 9 T1 end --------- XXXXXXX --- FIRST CRASH! --- XXXXXXX --------12 8 T2 abort -13 12 T2 CLR P3 (undonextLSN=4)-------- XXXXXXX --- SECOND CRASH! -- XXXXXXX --------The log ends right after the second crash, before the second recovery procedure is initiated. Consideringagain that the system employs the ARIES recovery algorithm, answer the following questions.
The log ends right after the second crash, before the second recovery procedure is initiated. Consideringagain that the system employs the ARIES recovery algorithm, answer the following questions.1. What is the state of the transaction table after the analysis phase in the recovery from the firstcrash? What is the state of the transaction table after the analysis phase in the recovery from thesecond crash? Explain how these states differ and why.2. What is the state of the dirty page table after the analysis phase in the recovery from the firstcrash? What is the state of the dirty page table after the analysis phase in the recovery from thesecond crash? Explain how these states differ and why.3. At what LSN does redo start in the recovery from the first crash? What about in the recoveryfrom the second crash? Explain how these LSNs differ and why.4. In the scenario, the redo phase in the recovery from the first crash completes. Can we say whichupdates will cause actual writes to data pages in the redo phase of the recovery from the secondcrash? Explain why or why not.5. Show the additional contents of the log after the recovery procedure completes after the secondcrash. Provide a brief explanation for why any new log records shown need to be added
