Recovery System Dbms

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17. Recovery System in DBMS - Presentation Transcript 1. Chapter 17: Recovery System * Failure Classification * Storage Structure * Recovery and Atomicity * Log-Based Recovery * Shadow Paging * Recovery With Concurrent Transactions * Buffer Management * Failure with Loss of Nonvolatile Storage * Advanced Recovery Techniques * ARIES Recovery Algorithm * Remote Backup Systems 2. Failure Classification * Transaction failure : * Logical errors : transaction cannot complete due to some internal error condition * System errors : the database system must terminate an active transaction due to an error condition (e.g., deadlock) * System crash : a power failure or other hardware or software failure causes the system to crash. * Fail-stop assumption : non-volatile storage contents are assumed to not be corrupted by system crash * Database systems have numerous integrity checks to prevent corruption of disk data * Disk failure : a head crash or similar disk failure destroys all or part of disk storage * Destruction is assumed to be detectable: disk drives use checksums to detect failures 3. Recovery Algorithms * Recovery algorithms are techniques to ensure database consistency and transaction atomicity and durability despite failures * Focus of this chapter * Recovery algorithms have two parts * Actions taken during normal transaction processing to ensure enough information exists to recover from failures * Actions taken after a failure to recover the database contents to a state that ensures atomicity, consistency and durability 4. Storage Structure * Volatile storage : * does not survive system crashes * examples: main memory, cache memory * Nonvolatile storage : * survives system crashes * examples: disk, tape,

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