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Какой механизм в PostgreSQL обеспечивает согласованность данных при одновременном выполнении нескольких транзакций без блокировок чтения?
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Locking
Two-phase commit
MVCC (Multiversion Concurrency Control)
Snapshot isolation
Deadlock detection
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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.

A project of our size needs at least a few hundred million dollars per year to keep going,” Mr. Durov wrote in his public channel on Telegram late last year. “While doing that, we will remain independent and stay true to our values, redefining how a tech company should operate.

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