可能没有足够的磁盘空间来完成该文件的写操作，或者由于没有足够的内存可用，分配缓冲区可能失败。
There might not be enough disk space to complete the file write operation, or allocating the buffer could fail if not enough memory is available.
如果将缓冲区大小设置为 0，那么将发生同步写日志操作，而不使用审计缓冲区。
When the size of the buffer is set to 0, synchronous log writing occurs, and the audit buffer is not used.
为了说明这一情况，让我们研究一个简单示例，该示例演示了从同一个缓冲区读和写一个字符。
Having said that, let's examine a quick example to demonstrate writing and reading a char from the same buffer.
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