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Concurrency Control

Concurrency Control. Conflict serializability Two phase locking Optimistic concurrency control. Source: slides by Hector Garcia-Molina. Concurrently Executing Transactions. T1 T2 … Tn. DB (consistency constraints). Example:. T1: Read(A) T2: Read(A) A  A+100 A  A  2

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CS542

CS542. Concurrency Control: Theory and Protocol. Professor Elke A. Rundensteiner. For Schedule D: Sd=r 1 (A)w 1 (A)r 2 (A)w 2 (A) r 2 (B)w 2 (B)r 1 (B)w 1 (B). T 1  T 2 T 2  T 1. T 1 T 2 . D cannot be rearranged into serial schedule.

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557 views • 41 slides

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