transaction in the way everyone else here is using it is referring to the primitive provided by the database which gives certain guarantees (depending on isolat

transaction in the way everyone else here is using it is referring to the primitive provided by the database which gives certain guarantees (depending on isolation level) wrt reads and writes. Even in the context of "transaction" the business activity, they are an extremely useful tool for building up exactly the kind of sequencing and dependency guarantees you refer to.