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undo log是什么时候落盘的？

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undo log是什么时候落盘的？

网上大部分说的都是redo log的落盘时机，但是没说undo log，想知道undo log是什么时候落盘的？落盘机制是怎样的？是否也有参数控制落盘时机？


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undo log就是记录的旧版本，在插入这条记录的时候就已经落盘了。

而插入记录的时候首先把记录写在insert buffer里面，由master线程在事务commit时（默认）落盘，改策略通过innodb_flush_log_at_trx_commit参数配置


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