We also define a macro INBUFSIZ, which is the size of a character array used as a buffer while reading the input.
我们还定义了宏inbufsiz，它是在读取输入时用作缓冲区的字符数组的大小。
When the Database creates this file, it sets its size to 16 KB and allocates the first Chunk in the array to buffer.
当Database创建这个文件时，它将其大小设为16 KB，并分配数组中的第一个Chunk来进行缓冲。
An extremely common kind of buffer is simply an array of characters.
极其常见的缓冲区种类是简单的字符数组。
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