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Какой механизм в MySQL позволяет выполнять атомарные операции обновления с условием, чтобы избежать гонок при конкурентном доступе?
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Использование транзакций с уровнем изоляции READ COMMITTED
Использование операторов LOCK IN SHARE MODE
Использование оператора SELECT ... FOR UPDATE
Использование триггеров BEFORE UPDATE
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