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Which versions of PostgreSQL and spatial types are supported with ArcGIS 10.1 and ArcGIS 10.1 SP1?
Beginning with ArcGIS 10.1, all databases used with ArcGIS must be 64-bit. The following ArcGIS, PostgreSQL, spatial type, and operating system combinations are supported:
See the 10.1 system requirements link under Related Information for specific operating system versions that are supported.