Combination (a + b) and (b + c) is successful because the total Shared memory required to initialize the databases are 1.5gb (894 + 608) and 1.46gb (608 + 850) respectively.

组合(A + B)和组合(B + C)获得成功，因为它们初始化数据库所需的共享内存总量分别是1.5 GB(894 + 608)和1.46 GB (608 + 850)。

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