An application reserves space in the log when it has data that is to be written to the log in the future, but cannot write it immediately.
如果应用程序有将在日后写入记录档但无法立即写入的资料时，应用程序就会在记录档中保留空间。
An application reserves space in the log when it has data that is to be written to the log in the future, but cannot write it immediately.
如果应用程序有将在日后写入记录档但无法立即写入的资料时，应用程序就会在记录档中保留空间。
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