Solution : https://service.sap.com/sap/support/notes/1379260 (SAP Service marketplace login required)
Key words : 
terms sql cache performance bw reporting query statement reason, tp monitor client accounting string attribute, rsadmin parameter execute program sap_rsadmin_maintain, bw reporting query, setting rsadmin parameter db6_set_bwqueryname, find long running statements, db6 sql cache, long running statements, sql statements executed, sql statement
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