是否可使用软引用的关键在于，应用程序是否可从大量缓存的数据恢复。
The key to whether a soft reference can be used is whether an application can recover from the loss of the data being cached.
可以花多少时间恢复数据库和应用程序配置？
How much time can you spend recovering the database and application configuration?
对于许多应用程序，尤其是日志文件和数据库，这种恢复删除文件的方法非常有用。
This method of recovering deleted files is handy for many applications, especially log files and databases.
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