Checkpoint kinase 2 细胞周期检测点激酶
NiLFS (2) creates these checkpoints as changes are made, but you can also force a checkpoint to occur.
每当发生改变时，NiLFS(2)都会创建这些检查点，但是也可以强制创建检查点。
Top: an East German border soldier looking at a man hammering a section of the Berlin Wall near the Allied checkpoint Charlie on June 2, 1990.
上图：1990年6月2日，一名东德边防士兵看着一名男子锤击盟军查理检查站附近的一处柏林墙。
A checkpoint has two purposes: (1) to establish data consistency, and (2) enable faster database recovery.
一个检查点有两个目的：(1)确保数据一致性，和(2)更快的数据库恢复。
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