Basic HTML version of Foils prepared July 6 99

Foil 171 ACID

From Object Web Computing Technologies CPS714 Computational Science Information Track -- June 16 99. by H. Timucin Ozdemir
1 ACID stands for:
  • atomicity: a transaction is an indivisible unit of work. Atomicity is defined from the consumer's perpective.
  • consistency: after the execution of transaction, the system should be in a correct state.
  • isolation: a transaction's behavior is not affected by other transactions that execute concurrently.
  • durability (persistence): A transaction's affects are permanent after it commits.
2 ACID provides:
  • serializability : transactions execute concurrently while achieving the same result as if they had executed serially.
  • commit processing : changes are permanent if a transaction commits while changes are removed if a transaction fails.
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