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Implementation Of Atomicity And Durability

  1. The recovery- management component of a database system implements the support for atomicity and durability.

    E.g. the shadow-database scheme:

  2. All updates are prefabricated on a shadow copy of the database

    • db_pointer is made to repair to the updated shadow copy after
    • the transaction reaches inclined commit and
    • all updated pages make been flushed to disk.


  3. db_pointer ever points to the modern conformable repeat of the database.

    • In case transaction unsuccess, old consistent duplicate pointed to by db_pointer can be used, and the shade reduplicate can be deleted.

  4. The shadow-database scheme:

    • Assumes that exclusive one transaction is live at a instant.
    • Assumes disks do not break
    • Useful for book editors, but
      • extremely inefficient for macro databases
      • Variant called shadow paging reduces copying of information, but is still not pragmatic for large databases

  5. Does not interact concurrent transactions

Implementation Of Atomicity And Durability Assignment Help

fig:Implementation Of Atomicity And Durability

Explanation of Image

The shadow-database scheme:

  • Assumes disks to not disappoint
  • Useful for book editors, but extremely inefficient for large databases: executing a single transaction requires copying the entire database.

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