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I wanted to know, how SharePoint gets the name of a document when checking it in or uploading it to any document library. How can I imagine this architecture? I'm asking myself this question, because I am curious how SharePoint knows, that when a document already exists in a library it gives a new higher version number to it.

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As with all Web applications, when you upload a document, the file name is posted to the server along with the file content.
SharePoint gets the file name, and checks in the SQL content DB if a file with the same name exists in the same location. If it finds one, there's two options:

  1. Either the library is configured for versioning (this is checked again with a SQL query on the content DB): in that case, a new version is pushed into the DB.
  2. Or the library is not set for versioning: in that case, an error is displayed to the user.
  • Thank you for your helpful response. One more little question: Can one talk about a certain component (if so, whats the name of it?), which task is to compare the file name of an uploaded document with file names in the DB - or in other words, which can "read" the name of a document and compare it to others? – SteffPoint Jan 8 '17 at 13:14
  • That's a very simple task, coded in the DLLs/stored procedures of SharePoint. There's no real "component" for such a task. It's simply part of the core SharePoint code. – Evariste Jan 8 '17 at 13:15

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