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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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SQL для тестировщика Telegram | DID YOU KNOW?

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The messaging service and social-media platform owes creditors roughly $700 million by the end of April, according to people briefed on the company’s plans and loan documents viewed by The Wall Street Journal. At the same time, Telegram Group Inc. must cover rising equipment and bandwidth expenses because of its rapid growth, despite going years without attempting to generate revenue.

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