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Kaaren's Corner
By Kaaren Linton, Librarian/Alexandria Trainer
WAN, CU, MDS???
Text message? Alphabet soup? No, in Alexandria, these acronyms represent different Alexandria options available to school districts. Alexandria offers distributed union, central union, multi-data station, and single-site systems for libraries. This diversity allows Alexandria to provide a perfect automation system to fit everyone’s needs.
At some point in time, your district may contemplate changes for the way library automation is handled in your district. Being aware of the multiple ways Alexandria can be set up for your district can help you to make wise choices.
In any of these system options, you have the ability to search the collections of the other libraries by setting the Address Books in the Administration Global Preferences.
Distributed Union (WAN)

For years, Alexandria has had the option of running as a Distributed Union system that is often referred to as a Wide Area Network (WAN) configuration. With an M license, this is an add-on feature; however, with an A license, it is included in the license.
In this configuration, each library’s database resides on a computer at that library site and the librarians operate autonomously setting their own policies and preferences. Inter-library loan is not so easily accomplished as on a Central Union system, but it is still possible.
Central Union

The best example of a Central Union system is to think public library system where there are multiple libraries, but only one database containing patrons and items. Alexandria has provided some specific school-oriented features to its Central Union system. For instance, you may set your preferences for the Researcher to show all titles available in the system or just those owned by your library, and holds and reservations may be limited to the items owned by the school library instead of patrons from all areas of the district being able to put holds on any item owned by any library within the system.
The advantage of a Central Union system is the ease of sharing resources via inter-library loan (ILL) because all items are in the same database. Your district tech support personnel will see the advantage of having only one computer necessary to act as a Data Station and only one person needs to handle the Backups, Archiving and Rebuilds.
The disadvantage of a Central Union system is that librarians generally feel a loss of autonomy since this system works best when there is community agreement on policies and many preferences must work the same way everywhere. Having a committee to discuss and resolve issues is valuable to making this system run smoothly. Another issue is that barcodes must be unique across the entire district and any duplicate barcode issues will need to be resolved before switching to this type of system.
Multi-Data Station

The Multi-Data Station system is a favorite of both techs and librarians. The easiest way to explain this type of system is to say “condo living” for libraries—one computer, but multiple, separate databases for each library with the libraries retaining control of the way they operate. Techs love that only one computer is needed to serve as a Data Station for all libraries and that saves money since additional computers are not needed to serve as individual Data Stations and it saves time for them because they are only maintaining the one Data Station/Server. As mentioned, librarians love it because they retain the ability to set policies and preferences for their library independently from the other libraries and they don’t need to worry about issues such as using the same barcode ranges as other libraries.
One concern is that the district tech responsible for the Data Station must truly understand the necessity for daily backups of the various data folders, how many must be retained and the need for these to be stored off-site. The Alexandria utility, Rebuild, should be run once a week on this type of system, but the Scheduled Events preferences will make this so easy for the tech to set. The only other minor disadvantage is that all libraries must update to the newest version of Alexandria at the same time. ∞
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