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It is not entirely clear from MySQL documentation whether the InnoDB engine implements true serializable isolation1 or snapshot isolation, which is often confusingly called “serializable” too. Which one is it?
If MySQL InnoDB doesn’t, are there any completely free, production-quality RDBMS which do?
1 where “true serializable isolation” means the absence of not only read anomalies as per the SQL standard, but also the write skew anomaly, explained in further detail here.
Postgres has support for true serializable isolation starting with version 9.1. It certainly qualifies both as “completely free” and “production-quality”.