Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Chapter 19, Problem 23E

Explanation of Solution

Crash during recovery:

  • In the given figure, the logs have no checkpoint, so recovery would start from the beginning of the logs.
  • Redo phase:
    • The contents of the undo list are T0, T1 as the start records for both of them exist but not their commit or abort records.
    • The redo phase would end up adding the log records given below:

      0, B, 2050>,

      0, C, 600>,

      1, C, 400>

      0, C, 500>

  • Undo phase
    • Scan the...

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We are considering the RSA encryption scheme. The involved numbers are small, so the communication is insecure.  Alice's public key (n,public_key) is (247,7). A code breaker manages to factories  247 = 13 x 19  Determine Alice's secret key. To solve the problem, you need not use the extended Euclid algorithm, but you may assume that her private key is one of the following numbers 31,35,55,59,77,89.
Consider the following Turing Machine (TM). Does the TM halt if it begins on the empty tape? If it halts, after how many steps? Does the TM halt if it begins on a tape that contains a single letter A followed by blanks? Justify your answer.
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