Spanner, CockroachDB, YugabyteDB, TiDB or Aurora DSQL: which one takes the orders past one writer?

Inside the full comparison

• 6 questions to ask first, each pointing at the products it favours
• 5 problems from the shop, drawn with no product and then once for each of the 5 products: 30 drawings
• One drawing of how each of the 5 products is built, with what a read and a write do inside it and what limits it
• 12 more things compared, one short answer per product, with 85 checked claims and 20 warnings
• 2 scenarios, Past one writer and Keep Postgres, each showing how a changed requirement affects the choice or design
• The interview answer in four moves, filled in for this family
• 122 vendor pages checked in 2026-09, linked next to every claim