Solution : https://service.sap.com/sap/support/notes/638230 (SAP Service marketplace login required)
Key words : 
terms db6 db2udb sql5130 sql5130n util_impact_lim reason, ~> db2 update dbm cfg, db2 update dbm cfg, dbm cfg parameter util_impact_lim, db2 udb v7, db2 udb v8, database manager configuration, diaglevel 4  sql5130n, configuration parameter, util_impact_lim 100after
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