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Recovery with Concurrent Transaction

  • Whenever more than one transaction is being executed, then the interleaved of logs occur. During recovery, it would become difficult for the recovery system to backtrack all logs and then start recovering.
  • To ease this situation, 'checkpoint' concept is used by most DBMS.

As we have discussed checkpoint in Transaction Processing Concept of this tutorial, so you can go through the concepts again to make things more clear.

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