If another log checkpoint record is encountered while it is in drain mode, it goes back to buffering mode.
如果服务器处于排出模式下时遇到另一条日志检查点记录，那么它会回到缓冲模式。
When this command is issued, all data files that are in the online backup mode will be issued checkpoint SCN.
当发出这个命令时，处于联机备份模式的所有数据文件都将被发放检查点 SCN。
The secondary may encounter another checkpoint log record while it is in drain or buffering mode, and you may see pending checkpoint increased.
次要服务器处于排出模式或缓冲模式下时，可能会遇到另一条检查点日志记录，您会看到挂起的检查点在增加。
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