Implementation Of Atomicity And Durability Assignment Help

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

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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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