Step 1

check who is connecting 










Step 2

disconnect all user









Step 3

make sure no lock, if there is, disconnect it










Step 4

upgrade geodatabase again without error








Step 5

must disconnect all connection first then lock second before upgrade

order matters, connection 1st, lock 2nd







Step 6

what if arcgis server always try to connect, even I disconnect, in 2 sec, a new connection created, cause failed to upgrade geodatabase






Step 7

what if I disconnect all user, I still getting error, try to open a new ArcPro project, current ArcPro maybe created with old version V2.x.  I am using new arcPro V3.2 may not compatible with old ArcPro project file.





Step 8



Step 9

don't forget to check allow new connection




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