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When using direct connect with ArcSDE on a 64-bit operating system, the following error message is encountered:
"Failed to connect the specified server. Server library could not be loaded."
Because ArcGIS Desktop is a 32-bit application, it cannot work with applications created with 64-bit operating system libraries.
Select one of the two solutions described below.
In ArcGIS 10.1, the direct connection can be made using Oracle Instant Client. It does not require an Administrative Client as required in ArcGIS 9.3.1 and 10.0. See the ArcGIS Help under Related Information for more information.