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Chapter 4: Concurrency Control Algorithms

Chapter 4: Concurrency Control Algorithms. 4.2 General Scheduler Design 4.3 Locking Schedulers 4.4 Non-Locking Schedulers 4.5 Hybrid Protocols 4.6 Lessons Learned. „The optimist believes we live in the best of all possible worlds. The pessimist fears this is true.“ (Robert Oppenheimer).

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Carnegie Mellon Univ. Dept. of Computer Science 15-415 - Database Applications

Carnegie Mellon Univ. Dept. of Computer Science 15-415 - Database Applications. C. Faloutsos Concurrency control - deadlocks. General Overview. Relational model - SQL Functional Dependencies &amp; Normalization Physical Design &amp;Indexing Query optimization Transaction processing

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Inconsistent retrieval (is locking enough CC? NO!)

T1 (transfer). T2 (audit). = 1200. Inconsistent retrieval (is locking enough CC? NO!). @@@ ________ __/BANK) @ - - @ |ACCOUNTS| _____ &lt; $&gt; | @` - ' |--------| |AUDIT| &gt;___' | ____ |CHECKING| |Ch__ | .|

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