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PostgreSQL has no mature Vitess alternative. Hence, the largest oss OLTP database deployments tend to be MySQL. Like YouTube and Uber for example.

This is changing soon with Neki.

Nice. But it's not even available yet.

It will take years to call this mature. Certainly not "soon"

For me that page has basically 0 descriptive content.

YouTube has migrated mostly to Spanner from what I hear