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Relationship · Introduces Risk
event sourcingIntroduces Risklong running transaction bloat
Source: Pattern·Target: Failure Mode

Summary

Event-sourced systems that open a database transaction for the full event application cycle create long-running transactions that prevent VACUUM from reclaiming MVCC dead tuples.

Evidence

  • ·long_running_transaction_bloat lists event_sourcing in affects_patterns and is triggered by batch processing in a single large transaction (failure_modes/long_running_transaction_bloat.yaml)
  • ·event_sourcing runs on postgresql and requires projection-rebuild (full-stream replay) tooling; normal appends are low-contention (patterns/event_sourcing.yaml)

Evidence grounding

Grounded, 2 supporting items

The risk is a full event-replay/rebuild wrapped in one PostgreSQL transaction, not the normal append path.