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HiFX Builds DBSteward to Solve Per-Database Cost Allocation on Shared Cloud Instances

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HiFX developed an open-source tool called DBSteward to address a common cloud billing problem: AWS RDS and most managed database services bill at the instance level, making it impossible to attribute costs to individual databases sharing that instance. This creates friction for finance teams trying to implement chargebacks, obscures noisy-neighbor performance issues, and leaves SaaS providers unable to calculate accurate per-tenant margins. The core challenge is that no single resource metric — CPU, storage, or I/O — fairly represents usage across all database types, and system overhead further complicates any simple cost-split formula. DBSteward sidesteps the billing system entirely, instead collecting granular metrics from within the database engine to build a defensible, weighted cost allocation model. The tool is designed to handle the technical nuances of counter versus gauge metrics and ensures tracked databases are not overcharged for capacity consumed by system-level processes.

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