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POMulti-user application without need to install anything - embedded database that allows concurrent user writes?
 

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    <p>I need to create an application, that</p> <ol> <li>is used by multiple users concurrently </li> <li>does not require <strong>any</strong> installation</li> <li>has a centralized data storage</li> <li>data must be stored <strong>inside</strong> company's network</li> <li>i <strong>don't have access</strong> to company's internal database servers or webservers</li> </ol> <p><strong>These restrictions are not of my own</strong> - these are coming from my customer - this is a branch of a global company and there are some big IT policy restrictions on a global company level, that they can not impact on their level (something like that), but they still need a software. </p> <p>My intent was to find <strong>HOW</strong> to provide them with a working piece of software despite those restrictions. </p> <p>So the only option (to my understanding) is to store data on a network share - in one or more files. The problem was to find a way how to provide a concurrent write access to those files.</p> <p><strong>RESEARCH so far</strong></p> <ul> <li>First what came to my mind was using SQL Server Compact and place it on a network share</li> </ul> <p><a href="http://technet.microsoft.com/en-us/library/ms171817.aspx" rel="nofollow">SQL Server Compact allows only one connection when located on a network share</a></p> <ul> <li>Then I found SQLite - did some research and found out that it has some improvements over SQL CE</li> </ul> <p><a href="http://www.sqlite.org/faq.html#q5" rel="nofollow">SQLite database file locked when writing, but possible concurrent reading operations</a></p> <ul> <li>Then I found VistaDB, which seems to offer the functionality that I need but it is very expensive - it costs 1295$ per developer...</li> </ul> <p><a href="http://www.vistadb.net/technical/serverless.aspx" rel="nofollow">VistaDB embedded database provides row and table level locking!</a></p> <p><strong>So refined question is</strong></p> <p>Which embedded databases support concurrent user write access? (Is there alternatives for VistaDB in this respect?) - please, provide <strong>facts</strong>, not opinion.</p>
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    1. COI suggest you find a technology that works (such as sql server express) and work on getting the ridiculous restrictions removed.
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    2. CO@Dan-o well unluckily in this case I can not get those restrictions removed, but i found out that sql server compact could work the only thing is that i have to make disconnected app, but that could work for some 5-10 users, but in this case there will be up to 50 users. The only thing that might work would be to logicaly and physicaly split this database in multiple files so that for each file there would be only a few concurent users.
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    3. CO@Dan-o Wanted to put a bounty on my question, but... it happens that i am 4 reputation short... dammit :(((
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