Solution : https://service.sap.com/sap/support/notes/556764 (SAP Service marketplace login required)
Key words :
svrmgrlsvrmgr> connect internalsvrmgr> select, sql> analyze table sapr3, sql net message, sql> exec dbms_stats, symptom r3up hangs, terms act_610act_620act_46cact_46dact_640act_700act46cact610act620act640act700r3uphangoracle reason, sap release hangs, source code correction, user ora<sid>, worst-case scenario
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