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xiongcc
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optimize format
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How to break a database, Part 2- Simulate infamous transaction ID wraparound.md

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这个方法需要一些时间,但效果很好。已在多个地方讨论过:
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- [ [A question from Telegram chat](https://twitter.com/samokhvalov/status/1415575072081809409)](https://twitter.com/postgresql/status/1338516236636936192)
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- [A question from Telegram chat](https://twitter.com/samokhvalov/status/1415575072081809409)
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- [How to simulate the deadly, infamous, misunderstood & complex ‘Transaction Wraparound Problem’ in PostgreSQL](https://fatdba.com/2021/07/20/how-to-simulate-the-deadly-transaction-wraparound-problem-in-postgresql/)
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首先,开启一个"长时间运行的事务" (分配一个正常的 XID 给它,因为它将是一个写事务) — 并保持该会话处于开启状态 (我们将使用一个命名管道,也称为 FIFO,让 `psql` 会话夯住):

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