Course Solutions Uncategorized (Solved) : Consider Dbms Using Aries Protocol Logging Records Following Format Log Records Log Contai Q30435089 . . . .

(Solved) : Consider Dbms Using Aries Protocol Logging Records Following Format Log Records Log Contai Q30435089 . . . .

 

Consider a DBMS using ARIES protocol for logging records with the following format of log records: <transactionID, variable, beforeValue, afterValue> The log can contain checkpoint begin, checkpoint end, transaction begin, transaction commit, transaction end and undo action records. Assume below is what DBMS retrieve in the log after a crash: 1 <BEGIN CHECKPOINT 2 <END CHECKPOINT> 3 <T1 ,A, 10, 20> 4 <T2, B, 30, 40 5 <T1 COMMIT 6 <T1 END 7 <T3, C, 50, 60 8 <T4, D, 50, 60 9<T2 COMMIT Answer the following questions assuming that there is no dirty pages nor active transactions during 

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