In contrast to circular logging, the archival logging process creates a new log file when the last log file is filled so that future transactions will not overwrite existing log files.

与循环日志记录相比，当最后一个日志文件写满时，归档日志记录过程会创建一个新的日志文件，这样将来的事务就不会覆盖现有的日志文件。

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The type option lets you replace an existing type tree file by selecting Overwrite file or replace existing types, and add new types by selecting Override type.

通过选择overwrite file或Replace existing types, type选项允许您替换一个现有类型树文件，并通过选择override type添加新类型。

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Note that this can only save you while you're trying to redirect output to an existing file — it isn't any help if you're using cp or mv to overwrite the file.

注意，这只能防止把输出重定向到现有文件；如果使用cp或mv覆盖文件，这个变量没有任何帮助。

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