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Transaction Management

Overview. TransactionProperties of transactionPessimistic

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Transaction Management

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    1. Transaction Management by Benjamin Nguyen

    2. Overview Transaction Properties of transaction Pessimistic & optimistic techniques Locking No lock techniques Oracle recovery tools

    3. Transaction An action, or series of actions, carried out by a single user or application program, which reads or updates the contents of the database

    4. Properties of Transaction ACID Atomicity: all or nothing property. (Responsible by DBMS recovery subsystem) Consistency: database must be transform from one consistent state to another consistent state.

    5. Properties of Transaction (cont.) ACID Isolation: transaction execute independently of one another. (Responsible by concurrency control) Durability: The effects of a successfully completed (committed) transaction are permanently recorded in the database and must not be lost because of a subsequent failure (Responsible by recovery subsystem)

    6. Over view of Database

    7. Pessimistic & Optimistic techniques Pessimistic Check for conflict when read/write Optimistic Only check for conflict when the transaction wishes to commit

    8. Pessimistic & Optimistic techniques Pessimistic Using locking techniques Optimistic The concurrency control that does not use lock and it involve the following phases: Read phase Validation phase Write phase

    9. Optimistic Techniques

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