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Two-phase locking

In databases and transaction processing, two-phase locking (2PL) is a pessimistic concurrency control method that guarantees conflict-serializability. It is also the name of the resulting set of database transaction schedules (histories). The protocol uses locks, applied by a transaction to data, which may block (interpreted as signals to stop) other…

Read and write locks, Variants & Overview

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Read and write locks

SerializabilityIf and only if
2 related topics

Variants

ContentionB-trees
2 related topics

Overview

DatabasesTransaction processingConcurrency controlSchedulesDatabase transaction
7 related topics

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Overview

Read and write locks

Variants

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Map overview Semantic statistics

Two-phase locking

Nodes15
Edges14
Triples23
Avg. degree1.87
Density0.133333
Components1

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Two-phase locking

Top relations

related to Strict two-phase locking · 7
Two-phase locking → B-trees, Bottleneck, On, S2PL, This, To, Unlike
related to Strong strict two-phase locking · 6
Two-phase locking → Every SS2PL, Rigorous, Rigorousness, S2PL, SS2PL, To
related to Conservative two-phase locking · 5
Two-phase locking → C2PL, Conservative, In, Strict, This
related to Two-phase locking · 5
Two-phase locking → According, Contracting, Expanding, Growing, Shrinking

Important terminology Word statistics

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Important terminology

locks transaction phase released 2pl protocol lock locking transactions two two-phase acquired c2pl may read write also used s2pl ss2pl

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Two-phase lockingrelated to Conservative two-phase lockingConservative0.60section
Two-phase lockingrelated to Conservative two-phase lockingC2PL0.60section
Two-phase lockingrelated to Conservative two-phase lockingThis0.60section
Two-phase lockingrelated to Conservative two-phase lockingIn0.60section
Two-phase lockingrelated to Conservative two-phase lockingStrict0.60section
Two-phase lockingrelated to Strict two-phase lockingTo0.60section
Two-phase lockingrelated to Strict two-phase lockingS2PL0.60section
Two-phase lockingrelated to Strict two-phase lockingOn0.60section
Two-phase lockingrelated to Strict two-phase lockingUnlike0.60section
Two-phase lockingrelated to Strict two-phase lockingThis0.60section
Two-phase lockingrelated to Strict two-phase lockingB-trees0.60section
Two-phase lockingrelated to Strict two-phase lockingBottleneck0.60section

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