Chapter 23 Data Base Recovery Techniques

Database Recovery Techniques Recovery Algorithms Are Techniques Ensure Transaction Atomicity And Durability Despite Failures The Recovery Subsystem Using Recovery Algorithm

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Ch 23 Database Recovery Techniques Recovery Algorithms Are Techniques To Ensure Transaction Atomicity And Durability Despite Failures The Recovery Subsystem Using Recovery Algorithm Ensures Atomicity By Undoing The Actions Of Transactions That Do Not Commit And Durability By Making Sure That All Actions Of Committed Transactions Survive Even If Failures Occur Two Main Approaches In Recovery Process Log Based Recovery Using WAL Protocol Shadow Paging Recovery Outline Recovery From Transaction Failures Means Restores The DB To The Most Recent Consistent State Just Before The Time Of Failure Usually The System Log The Log Sometimes Called Trail Or Journal Keeps The Information About The Changes That Were Applied To The Data Items By The Various Transactions A Typical Strategy For Recovery If There Is A Catastrophic Failure Se Chap 19 I E A Disk Cras

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