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Does ArcSDE support 64-bit Oracle on 64-bit operating systems?
ArcSDE is built as a 32-bit application on 32-bit operating systems with the exception of Compaq Tru64.
ArcSDE installation on the same machine with 64-bit Oracle is not a supported configuration.
If a 64-bit operating system is being used other than Compaq Tru64, use one of the following configurations:
1) Use a 32-bit version of Oracle ensuring the operating system vendor guarantees 32-bit compatibility with a 64-bit OS.
2) Install ArcSDE on a second machine using Net8 to connect to the 64-bit Oracle instance.
3) Use direct connect configuration to connect to the 64-bit Oracle 8i instance.