I wrote some pretty extensive ArcPy scripts for a project that required custom data-loading into PostgreSQL 9.4 using ArcGIS 10.4. In order to improve performance I created some large dictionary caches, which blew out 32-bit process space limits ("Out of client memory" errors), so I installed the 64-bit Background Geoprocessing module, changed the Windows batch script path to include "...\Python27\ArcGISx6410.4" and "...\ArcGIS10.4\bin64" (vice "..\Python27\ArcGIS10.4" and "...\ArcGIS10.4\bin") and I was in business.
When it came time to upgrade to 10.4.1, I experienced disaster -- My scripts weren't working! I couldn't even connect to PostgreSQL! Eventually, Tech Support walked me to a possible cause, and then I found the real cause: My connections failed because a PostgreSQL support library was missing from ArcGIS10.4\bin64 at 10.4.1. Unfortunately, the connections didn't fail in a useful way (say, by raising an exception), they sort of silently failed, only raising an exception when I tried to access the connectionProperties of the workspace description (props = arcpy.Describe(pathToDotSDEfile).connectionProperties)
So, for the record, the solution is to install a replacement for the missing "libintl-8.dll" library. This can be done by:
I'm sure a QFE will come out on this pretty quick, but at least there's lots of workarounds.
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