This class usually gets its data from a filesystem directory that contains a certain set of files that follow a certain structure, but it doesn't absolutely have to be a directory.

通常，这个类获取数据是通过一个包含遵循某种结构的某一文件集合的目录，但并不一定是一个目录。

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file, on which the administrator can set many parameters that affect ANSI SQL compatibility. All database files (except for text table data files) must be kept in the same directory.

所有数据库文件（文本表数据文件除外）必须放在同一个目录中。

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Updates each page of the block so that it appears empty (the physical data remains, but their slot directory entries are set to deleted).

更新块中的每个页，使之看上去为空(物理数据仍然在，但是它们的slot目录项被设为已删除)。

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