If the customer number is not null, that is, the customer is already known, the left hand path is followed (2), and the customer data is retrieved from the customer registration service (3).
如果客户编号不为空，即客户是已知客户，则遵循左侧的路径(2)，并从客户注册服务中检索客户数据(3)。
Mirrorlogpath (default: NULL) - This configuration parameter allows logs protection by keeping the same copy in the path specified.
mirrorlogpath(默认值是NULL)——这个配置参数允许通过在指定的路径中保存相同的副本来保护日志。
overflowlogpath (default: NULL) - Indicates the log path to use during rollforward recovery.
overflowlogpath（默认值是 NULL）—— 表示在前滚恢复期间使用的日志路径。
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