Уровни изоляции

[Olezha]

lost update, read committed, repeatable read, phantom read
https://uk.wikipedia.org/wiki/%D0%A0%D1%96%D0%B2%D0%BD%D1%96_%D1%96%D0%B7%D0%BE%D0%BB%D1%8C%D0%BE%D0%B2%D0%B0%D0%BD%D0%BE%D1%81%D1%82%D1%96_%D1%82%D1%80%D0%B0%D0%BD%D0%B7%D0%B0%D0%BA%D1%86%D1%96%D0%B9