1. UNIT IIConcurrency Control 2. Purpose of Concurrency Control• To enforce Isolation (through mutual exclusion) amongconflicting transactions.• To preserve database…
Slide 1CM20145 Concurrency Control Dr Alwyn Barry Dr Joanna Bryson Slide 2 Last Time Recovery Cascading & Its Avoidance Storage & Data Access Algorithms for: Shadow…
Chapter 11 Concurrency Control Lock-Based Protocols A lock is a mechanism to control concurrent access to a data item Data items can be locked in two modes : 1. exclusive…