Solution : https://service.sap.com/sap/support/notes/596423 (SAP Service marketplace login required)
Key words : 
sql> alter system reset event scope=spfile sid=' ', sql> alter system set      event='10181 trace, sql> alter session set events='10053 trace, = binary server side parameter file, server parameter file reason, date'      scope=spfile, show parameter spfile, show parameter event3, sql statements, terms event
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