Solution : https://service.sap.com/sap/support/notes/91772 (SAP Service marketplace login required)
Key words :
key -adabas dmissing idx, 'hourly' repetition period, abap program 'rsoratdb', abap 'rscoll00', abap 'rsoratdb', symptom error, db02 reason, performance monitor, transaction 'sm36', button 'steps'