# Ecommerce Reliability and Uptime > Keep essential shopping and order functions available by designing for component failure, recovery and measurable service health. - Type: Merchant guide - Level: Intermediate - Reading time: About 6 minutes - Audience: Written for store owners, builders, and designers refining high-performance ecommerce stores. - Last updated: 2026-11-04 - Canonical page: https://academy.getzenbasket.com/merchant-questions/ecommerce-reliability-and-uptime/ - Part of: [Merchant Questions](https://academy.getzenbasket.com/merchant-questions/) on ZenBasket Academy --- ## What you need to know ### What does ecommerce reliability mean? Ecommerce reliability is the ability to deliver correct shopping, payment, order and support outcomes consistently, including when components fail. It includes availability, data integrity, and recovery, not just whether a page responds. ### What is ecommerce uptime? Ecommerce uptime is the share of a defined period when a service or customer journey is available under its measurement rule. Define what counts as available, because a homepage response does not prove checkout works. ### What does 99.9% uptime actually mean? An uptime of 99.9% allows roughly 0.1% unavailability during the measured period, but the practical impact depends on when and where it occurs. Define the time window, excluded maintenance and customer journey before interpreting the figure. ### Why does my store occasionally become unavailable? A store may become unavailable because of deployments, exhausted capacity, database or network failure, certificate and DNS problems or a failing external service. Correlate the exact outage time with monitoring and change history. ### What parts of an ecommerce system can fail? Browsers, CDN, DNS, application servers, caches, databases, queues, search, payments, carriers and third-party apps can all fail. Map dependencies for each essential journey, so one failure does not remain invisible. ### How should ecommerce systems handle service failures? Use timeouts, isolation, safe retries, redundancy, health checks and recovery procedures matched to each dependency. Preserve order and payment integrity even when the customer-facing response cannot complete. ### Can a store remain usable when a nonessential service fails? Yes. Browsing, cart and checkout can remain usable when chat, reviews, analytics or recommendations fail, if those services are isolated and have deliberate fallbacks. ### A quick store check Write the essential customer journeys and the service-level signal for each, then review their recent failures and recovery times. --- ## Frequently asked questions ### Does 100% uptime mean no customer errors? No. A site can respond while checkout, search or another customer journey is broken. ### Should every component have the same reliability target? No. Set stricter targets for essential journeys than for optional features, based on customer and business impact. --- ## Related learning path - **Ecommerce Timeouts Retries and Failure Handling** - **Graceful Degradation for Ecommerce** - [ZenBasket Build Guide](https://help.getzenbasket.com/zenbasket-builder/)