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Depends SDE 32-bit/ 64-bit on the OS or on the RDBMS?

Question asked by kaspatoo on May 7, 2012
Latest reply on May 9, 2018 by vangelo-esristaff

I have a 64-bit operating system.
I do not know wether RDBMS (MS SQL Server) will be 32-bit or 64-bit.
When installing the Arc SDE need I install 64-bit because of the OS or will this depend on the RDBMS (wether this is 32-bit or 64-bit).

Or does this not matter and I am absolutely free to install SDE in 32-bit or 64-bit. What about the compatibility to OS and RDBMS, seen from bottom-up (SDE 32-bit while OS and/or RDBMS are 64-bit) or top-down (SDE 64-bit while OS and/ or RDBMS are 32-bit).