Solution : https://service.sap.com/sap/support/notes/1488208 (SAP Service marketplace login required)
Key words :
sql statements alter table ep_attr_values volatile alter table ep_attr_headers volatile 3, prerequisites start_j2ee_ep performs frequent database operations, volatile alter table ep_attr_headers, ep_attr_headers alter table ep_attr_values, upgrade reaches breakpoint start_j2ee_ep, remove volatile flag, set tables ep_attr_values, symptom bad performance, terms db2portaljavaupgradestart_j2ee_ep reason, avoid bad performance
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