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What protocol is used by RMAN to communicate with the server used for backing up/restoring data?

I searched everywhere but couldn't find any docs with this information.

Background: I am developing a proxy that backs up an oracle database to a different store

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The thing you are looking for is called the SBT API. I can't find any free documentation on it, but the process is that a vendor of say a tape library implements the functions of SBT (e.g. sbtopen(), sbtwrite() and so on), compiles them as a shared library (a .so file) and this is placed in the ORACLE_HOME. When RMAN starts it looks for a file called libobk.so and dynamically links to it. RMAN then calls the functions, and in turn the protocol between the MML (media management layer) and the actual hardware e.g. a tape library, is proprietary.

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  • These guys seem to have figured out the actual C API, which Oracle (foolishly) hides from developers.
    – Mikhail T.
    Jun 12 '18 at 19:30
  • I expect they make available to hardware vendors
    – Gaius
    Jun 12 '18 at 21:31
  • 1
    There are lots of creative applications for this API, that could be offered by other developers. For example, how about backing up directly to a cloud? Or integrating with Amanda? Sigh... Sybase/SQL Server are making the same mistake...
    – Mikhail T.
    Jun 13 '18 at 14:26
  • With Oracle it is all about the $$$
    – Gaius
    Jun 13 '18 at 15:32
  • With me it is all about $$$ too, nothing wrong with that. I call them "fools", because I think, they are not getting as much money as they could be by keeping the source code and even the APIs of non-essential parts closed. Anyway, this is all off-topic... Sorry...
    – Mikhail T.
    Jun 13 '18 at 20:45

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