When -pc+ is used, dbmlsync connects to the MobiLink server as usual, but it then keeps that connection open for use during
subsequent synchronizations. A persistent connection is closed when any of the following occur:
An error occurs that causes a synchronization to fail.
A synchronization is initiated in which the communication type or address are different. This could mean that the settings
are different (for example, a different host is specified), or that they are specified in a different way (for example, the
same host and port are specified, but in a different order).
When a persistent connection is closed, a new connection is opened that is also persistent.
The -pc+ option is most useful when the client synchronizes frequently and the cost of establishing a connection to the server
When -pc- is used, the connection is closed at the end of each synchronization and reopened at the start of the next synchronization.
By default, persistent connections are not maintained.