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What are the main challenges when working with both Oracle 64 bit and 32 bit versions?

An Oracle user asks about potential problems when importing and working with both 32-bit and 64-bit versions.

I have an Oracle 10g x86-64 on a SUSE Enterprise Edition 10 64 bit edition. I also have an Oracle 10g x86 on SUSE 9 32 bit. Can I import dumps from a 64 bit to a 32 bit version? What are the main challenges when working with both Oracle 64 bit and 32 bit versions?
The import utilities do not really care about whether it is a 32-bit or 64-bit version. So you should be able to import into 32-bit Oracle from a 64-bit dump file without problems.

For the most part, I really never worry about the word size (32 or 64 bit) when dealing with Oracle. If you have a 32-bit operating system, then you are constrained to a 32-bit Oracle version. If you are running a 64-bit OS, then you can run either Oracle word version, but in most cases, one would choose the 64-bit version. The 64-bit version will let you allocate a larger SGA than the 32-bit version, but other than that, most Oracle DBAs never give this much thought. There are probably a few minor points to consider for a very specific situation, but I haven't run into them.

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