I have as output log of my Orthanc server the follow:
W0131 14:53:09.576734 ServerContext.cpp:2520] W001: Accessing Dicom tags from storage when accessing study : 0020,000e;0020,0011;0020,0013
W0131 14:53:09.597958 ServerContext.cpp:2520] W001: Accessing Dicom tags from storage when accessing study : 0020,000e;0020,0011;0020,0013
W0131 14:53:09.625258 ServerContext.cpp:2520] W001: Accessing Dicom tags from storage when accessing study : 0020,000e;0020,0011;0020,0013
W0131 14:53:09.651928 ServerContext.cpp:2520] W001: Accessing Dicom tags from storage when accessing study : 0020,000e;0020,0011;0020,0013
W0131 14:53:13.292955 ServerContext.cpp:2520] W001: Accessing Dicom tags from storage when accessing study : 0008,0005;0008,1050;0032,4000;4008,0212
W0131 14:53:18.292645 ServerContext.cpp:2520] W001: Accessing Dicom tags from storage when accessing study : 0008,0005;0008,1050;0032,4000;4008,0212
W0131 14:53:24.694466 ServerContext.cpp:2520] W001: Accessing Dicom tags from storage when accessing study : 0008,0005;0008,1050;0032,4000;4008,0212
W0131 14:53:28.535694 ServerContext.cpp:2520] W001: Accessing Dicom tags from storage when accessing study : 0008,0005;0008,1050;0032,4000;4008,0212
W0131 14:53:33.529876 ServerContext.cpp:2520] W001: Accessing Dicom tags from storage when accessing study : 0008,0005;0008,1050;0032,4000;4008,0212
W0131 14:53:36.264820 ServerContext.cpp:2520] W001: Accessing Dicom tags from storage when accessing study : 0020,000e;0020,0011;0020,0013
W0131 14:53:38.517625 ServerContext.cpp:2520] W001: Accessing Dicom tags from storage when accessing study : 0008,0005;0008,1050;0032,4000;4008,0212
I tried to search something in different sources but don’t exists references about this. Some light of theses log messages?