High availability is a software design approach and implementation that ensures a prearranged level of operational performance will be met during a contractual measurement period.

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Principles behind writing highly-available fault-resilient systems.


A system’s capacity for self-healing when a fault occurs is a key measure of achieving high availability. Recently, Twilio used Chaos Engineering to close the gap and eliminate the need for human intervention for common faults involving our core queueing-and-rate-limiting system, Ratequeue.


GitHub uses MySQL as its main datastore for all things non-git, and its availability is critical to GitHub’s operation. The site itself, GitHub’s API, authentication and more, all require database access.


Azure SQL Database is deeply integrated with the Azure platform and is highly dependent on Service Fabric for failure detection and recovery, on Azure Storage Blobs for data protection and Availability Zones for higher fault tolerance. At the same time, Azure SQL database fully leverages the Always On Availability Group technology from SQL Server box product for replication and failover. The combination of these technologies enables the applications to fully realize the benefits of a mixed storage model and support the most demanding SLAs.