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SIE.8:3 - Forces
| Force | Tension |
|---|
| Freshness | Virtual reads can observe current source state, while network and source delays can still make answers stale or inconsistent. |
| Latency | Materialization and caching can respond quickly, while refresh and invalidation may violate the use’s time boundary. |
| Availability | Copies can survive source outages, while they can conceal that authority or access conditions changed. |
| Source authority | Querying the source keeps custody visible, while a receiver may need stable snapshots and reproducible answers. |
| Security and permission | Fewer copies reduce exposure, while live federation can broaden runtime credentials and cross-source disclosure. |
| Provenance and reproducibility | Materialized snapshots aid replay, while virtual results need captured queries, source versions, and occurrence metadata. |
| Operability and recovery | A simpler runtime can reduce failure modes, while hybrid arrangements add invalidation and coherence responsibilities. |
| Cost | Storage, compute, licenses, egress, support, and provider dependency trade differently across cases. |