Isolation Sérialisable
L'isolation sérialisable garantit que les transactions semblent s'exécuter dans un ordre séquentiel, maintenant la cohérence de la base de données.
L'isolation sérialisable garantit que les transactions concurrentes produisent des résultats équivalents à un ordre d'exécution en série, empêchant les lectures sales (dirty reads), les lectures non répétables et les lectures fantômes. Elle est généralement obtenue via un verrouillage strict à deux phases (2PL), un ordonnancement par horodatage ou des approches basées sur la sérialisation.
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❓ Questions fréquentes
What is serializable isolation?
Serializable isolation is the highest isolation level where concurrent transactions behave as if they occurred in some serial order.
How is serializable isolation achieved?
Techniques include strict two-phase locking, timestamp ordering, and serialization-based approaches. Optimistic methods may be used with validation to enforce serializability.
Is serializable isolation the same as serializability of a schedule?
Yes. It guarantees that every concurrent schedule is equivalent to some serial schedule.
What is the difference between serializable isolation and snapshot isolation?
Serializable isolation guarantees no anomalies for all operations, while snapshot isolation may allow anomalies like write skew or phantoms in some workloads.