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Re:Scaling to 100M: MySQL Is a Better NoSQL by StevePerkins on Wednesday May 25, 2016 @07:59AM (#11769104)
Same, but we use raw binary columns (i.e. "BINARY(16)" for MySQL and "BYTEA(16)" for PostgreSQL).

Conversion between the database-native UUID type and the application-layer UUID type is often so flaky (particularly with Java and JPA).

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