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The Ultimate Guide to Database High Availability

Percona

Defining high availability In general terms, high availability refers to the continuous operation of a system with little to no interruption to end users in the event of hardware or software failures, power outages, or other disruptions. If a primary server fails, a backup server can take over and continue to serve requests.

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Setting Up and Deploying PostgreSQL for High Availability

Percona

Where a high availability design once worked well, it can no longer keep up with more complex requirements. The tolerable downtime depends on business size, operations, and objectives, but that downtime must be minimal to minuscule (see the “Measuring high availability” chart below). there cannot be high availability.

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Progress Delayed Is Progress Denied

Alex Russell

Now in development in WebKit after years of radio silence, WebXR APIs provide Augmented Reality and Virtual Reality input and scene information to web applications. Apple's policy against browser engine choice adds years of delays beyond the (expected) delay of design iteration, specification authoring, and browser feature development.

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