persistency

Persistency refers to the quality or state of continuing, enduring, or lasting over time. It denotes the ability of a system, object, or phenomenon to remain in a given condition or to resist change, often despite challenges or interruptions. The term is sometimes used interchangeably with persistence, though in some domains a distinction is drawn between enduring characteristics (persistency) and the process of maintaining state (persistence).

In information technology, persistency describes the property that data survives beyond the lifetime of the process that created it. Persistent data is stored in non-volatile storage such as hard drives, solid-state drives, or cloud databases. Persistence is supported by databases, file systems, serialization, and object-relational mapping layers. Durable design, backups, and replication contribute to data persistency, while volatile memory like RAM does not guarantee persistence across failures.

In psychology and behavioral sciences, persistency is the tendency to continue striving toward goals despite difficulties, obstacles, or delays. It is closely related to, but distinct from, motivation, self-regulation, and grit. Measures often assess how long an individual continues an task in the face of discouragement.

In other domains, persistency can describe ecological or physical durability, the long-term stability of materials, or the continued effectiveness of interventions. The term is common in discussions of resilience, reliability engineering, and data management practices.