Databases: Concurrency Control

Concurrency Control ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A.C.I.D properties (1) ,[object Object],[object Object]

A.C.I.D properties (2) ,[object Object],[object Object]

Example Transaction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Discussing the Example ,[object Object],[object Object]

Problems with Concurrency ,[object Object],[object Object],[object Object],[object Object]

Lost Update ,[object Object],Begin transaction T1 read balance [ 100 ] balance = balance - 100 if balance < 0 print “insufficient funds” abort T1 end write balance [ 0 ] Initial Balance = 100 Begin transaction T2 read balance [ 100 ] balance = balance + 100 write balance [ 200 ] commit T2

Violation of Integrity Constraints

Violation of Integrity Constraints ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Inconsistent Retrieval ( Dirty Reads ) ,[object Object],[object Object]

Inconsistent Retrieval ( Dirty Reads ) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Concurrency Control ,[object Object],[object Object],[object Object],[object Object]

Conflicting Operations ,[object Object],[object Object],[object Object]

Serial Schedule ,[object Object],[object Object]

Serialisable Schedule ,[object Object],[object Object],[object Object]

General Solution ,[object Object],[object Object]

Rules for Equivalence of Schedules ,[object Object],[object Object]

Try these... ,[object Object],[object Object],[object Object]

Conflicting Operations ,[object Object],[object Object],[object Object],[object Object]

Conflicting Operations ,[object Object],[object Object]

Concurrency Control Techniques ,[object Object],[object Object],[object Object],[object Object]

Databases: Concurrency Control

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