Originally posted by BJE_DBA

Set tablespace to read-only

Export the DD info as Transportable Tablespace, Import it into the 2nd machine.

Query away....
Boy, you know what is RAC or OPS?!?! That is not even close, you are not reading same datafiles, you are reading each database own datafiles!

What you do is not even close, what you do is what we used to do since 2000 for DWH ETL processes.