Due to the large amount of data in the audit log table, a single INSERT statement will usually fail because the data per transaction exceeds the log file size of the database system.
因为审核日志表格里有大量的数据，单独的insert语句通常会失败，这是因为每个事务的数据超过了数据库系统里的日志文件的容量。
Besides specifying the format of the data that is to be written to the output file, you must also provide the name of that file, and an SQL SELECT statement to specify the data that is to be exported.
除了要指定写到输出文件中的数据格式之外，还必须提供该文件的名称和一个用于指定输出数据的SQL SELECT语句。
This is important in Python programs because file input and output are, by default, buffered; data isn't written as soon as you call a print statement but is instead written in chunks.
在Python程序中这很重要，因为在默认情况下，文件输入和输出是缓冲的；在调用print语句时，数据实际未被写入；相反，数据是成批写入的。
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