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I am developing a Windows desktop application (.exe) for billing and inventory management using NetBeans. The application will run on multiple systems (10 - 12 on average), all connected in a wired or wireless LAN and not connected to the internet. All applications on the different computers will communicate to a single common database that is also in the LAN (and not connected to the internet). Since it is a billing application we can expect concurrent read/write operations from many instances at a given time.

I am looking for a good database service that I can use for the above mentioned requirement. The needs-analysis is given below:

  1. The database will be used by a retail shopkeeper that use the application to generate bills/invoices and maintain inventory.
  2. The modification of data or updation of the database will happen continuously, probably for tens of thousands of times a day.
  3. The direct user ie. the retail shopkeeper do not know anything about databases or softwares in general. The IT support will be taken care of by me.
  4. The computers are basic windows 2007 or earlier systems with not-so-high hardware specs. They will also be NOT connected to the internet.
  5. The database should be able to manage concurrent read/write operations without delay, errors or loss of data.
  6. There should be a good level of security of the data in the database.
  7. Preferably a database that is free or at least is not so expensive.

Please help me with suggestions of database that I can use in this scenario. Thanks in advance.

P.S.: I am a novice developer, sorry for any half-baked or unclear information.

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