Aislamiento Serializado (Serializable Isolation)
El aislamiento serializado asegura que las transacciones parezcan ejecutarse en un orden serial, manteniendo la consistencia de la base de datos.
El aislamiento serializado garantiza que las transacciones concurrentes produzcan resultados equivalentes a un orden de ejecución en serie, evitando lecturas sucias, lecturas no repetibles y lecturas fantasma. Por lo general, se logra mediante bloqueo estricto de dos fases (2PL), ordenamiento por marcas de tiempo o enfoques basados en serialización.
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❓ Preguntas frecuentes
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.