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I want to install 8i and 10g on the same machine. Which to install first? Is there any procedure to follow the precedence of installations of different Oracle versions on same machine?
Since both Oracle8i and 10g will share the same global inventory on the server, my preferred method of installation is to first install Oracle8i, patch it to release 188.8.131.52 and then install Oracle 10g. It is possible to perform the installations in the reverse order but I think this is logical and should allow future patching of the 10g binaries or executables. I find the inventory to be somewhat finicky so after the installations have completed successfully, you might want to download the latest opatch and run 'opatch lsinventory' against the 10g binaries. If this runs successfully, your inventory is probably intact so you should not experience inventory problems patching in the future. You do not need to worry about the Oracle8i binaries as these will likely not be patched.