The Maximum Sessions property defaults to 1, which prevents concurrent processing on the listener port.
Maximumsessions属性的缺省值为1，其阻止在侦听器端口上进行并发处理。
To use concurrent transactions within a single VM, we just open a db4o server on our database file, directing it to run on port 0, thereby declaring that no networking will take place.
要在单个VM上执行并行事务，只需要在数据库文件上打开一个服务器，指定其运行端口为0，这样声明就不会有网络的发生。
To use concurrent transactions within a single VM, we just open a db4o server on our database file, directing it to run on port 0, thereby declaring that no networking will take place.
要在单个VM上执行并行事务，只需要在数据库文件上打开一个服务器，指定其运行端口为0，这样声明就不会有网络的发生。
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