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# Scale & Reliability

> Learn how ticketing systems handle high-demand onsales, waiting rooms, pre-queues and bots, how reliability is evaluated, and what changes as a ticketing business grows internationally.

**Ticketing demand is uneven: an onsale can bring more buyers in minutes than a system sees in a typical month. This subject explains how ticketing systems handle those peaks, how to judge whether a platform is reliable, and what changes as a ticketing business grows into new countries.** Scale is both a technical and a commercial question, because costs, margins and operating models change with volume.

## Start here

#### [What is an onsale in ticketing?](/scale-reliability/what-is-an-onsale-in-ticketing)

Learn what a ticket onsale is, how presales and general sales differ, and how operators prepare inventory, pricing, queues and checkout.

#### [How do ticketing platforms handle high-demand onsales?](/scale-reliability/how-do-ticketing-platforms-handle-high-demand-onsales)

How ticketing systems manage traffic spikes, waiting rooms, seat contention, reservations, payment failures, testing and live onsale monitoring.

#### [How do virtual waiting rooms work for ticket sales?](/scale-reliability/how-do-virtual-waiting-rooms-work-for-ticket-sales)

Understand how ticketing waiting rooms manage high-demand traffic, queue order, admission rates and customer expectations—and what they cannot guarantee.

#### [How do you evaluate ticketing platform reliability and uptime?](/scale-reliability/how-do-you-evaluate-ticketing-platform-reliability-and-uptime)

Learn how to assess ticketing uptime, purchase success, latency, recovery, incident response and high-demand onsale performance beyond headline percentages.

## Key ideas in this subject

#### Most demand problems are inventory problems under pressure

When many buyers want the same seats, the system must allocate fairly and never sell a ticket twice while checkout stays responsive.

#### Queues manage arrival, not availability

Waiting rooms and pre-queues control how many buyers reach the shop and in what order. They create no extra tickets.

#### Reliability should be evidenced, not asserted

Uptime figures, load tests and incident history mean little without definitions. Ask how each figure was measured.

#### International growth adds more than translation

Languages, currencies, payment methods, tax, data residency and reporting all change in a new country.

## Reading paths

All 17 explanations in Scale & Reliability, in 4 reading paths.

#### 1 · High-demand onsales

* [What is an onsale in ticketing?](/scale-reliability/what-is-an-onsale-in-ticketing)
* [How do ticketing platforms handle high-demand onsales?](/scale-reliability/how-do-ticketing-platforms-handle-high-demand-onsales)
* [How do virtual waiting rooms work for ticket sales?](/scale-reliability/how-do-virtual-waiting-rooms-work-for-ticket-sales)
* [What is a pre-queue in ticketing?](/scale-reliability/what-is-a-pre-queue-in-ticketing)
* [How do ticketing platforms control bots during onsales?](/scale-reliability/how-do-ticketing-platforms-control-bots-during-onsales)
* [How do large ticket presales manage access codes?](/scale-reliability/how-do-large-ticket-presales-manage-access-codes)

#### 2 · Performance and reliability

* [How do you evaluate ticketing platform reliability and uptime?](/scale-reliability/how-do-you-evaluate-ticketing-platform-reliability-and-uptime)
* [How do you performance-test a high-demand ticket onsale?](/scale-reliability/how-do-you-performance-test-a-high-demand-ticket-onsale)
* [How can ticketing checkout remain responsive under heavy demand?](/scale-reliability/how-can-ticketing-checkout-remain-responsive-under-heavy-demand)
* [How do you design ticketing integrations for high-demand onsales?](/scale-reliability/how-do-you-design-ticketing-integrations-for-high-demand-onsales)

#### 3 · Growing the business

* [How do ticketing technology costs change as a business grows?](/scale-reliability/how-do-ticketing-technology-costs-change-as-a-business-grows)
* [How can ticketing businesses protect margins as they scale?](/scale-reliability/how-can-ticketing-businesses-protect-margins-as-they-scale)
* [How can ticketing platforms support new countries and event types?](/scale-reliability/how-can-ticketing-platforms-support-new-countries-and-event-types)

#### 4 · International operations

* [What should a ticketing company consider before entering a new country?](/scale-reliability/what-should-a-ticketing-company-consider-before-entering-a-new-country)
* [How do ticketing platforms support different languages and locales?](/scale-reliability/how-do-ticketing-platforms-support-different-languages-and-locales)
* [How do international ticketing businesses manage data residency and cross-border access?](/scale-reliability/how-do-international-ticketing-businesses-manage-data-residency-and-cross-border-access)
* [How do multi-country ticketing teams standardise reporting without losing local detail?](/scale-reliability/how-do-multi-country-ticketing-teams-standardise-reporting-without-losing-local-detail)

## How this subject connects to others

#### [Events & Inventory](/events-inventory)

Onsales stress the inventory model, from holds to overselling prevention.

#### [Strategy & Selection](/strategy-selection)

Scalability evidence is a criterion when choosing a provider.