Checkpoint (CKPt) - Synchronizes the headers of data files and control files with the current redo log and checkpoint Numbers.
检查点(CKPt)——将数据文件头和控制文件头与当前重做日志和检查点数同步。
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While in buffering mode, the secondary stages any log page data coming from the HDR, onstat -g dri ckpt shows the log staging statistics as shown below.