TG: sql_for_qa/816

SQL для тестировщика

Что такое "сериализуемая" изоляция транзакций в Oracle и какую проблему она предотвращает?

Anonymous Quiz

a) Самый низкий уровень, предотвращает грязное чтение.

b) Гарантирует, что транзакции выполняются последовательно, предотвращая фантомные чтения.

c) Предотвращает неповторяемое чтение.

d) Предотвращает потерянные обновления, но допускает грязное чтение.

e) Позволяет чтение несохраненных данных.

f) Используется только для системных таблиц.

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