Applicationm with 3 backend-databases

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I have an application with 3 backend databases.
The 3. one is used for history and statistics.
The 1. one is the main database, the 2. is for customers (customerinfo)
I have done this to make the size of the database as small as possible.
Is there any disadvantges with the use of several backend-databases.
The problem is that in a network the saving process takes a lot of time.
(Saving a record)

reidarT


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