Solution : https://service.sap.com/sap/support/notes/408527 (SAP Service marketplace login required)
Key words : 
> set pagesize 50000> spool monit> select 'alter table, connect sap<sid>/<pwd>> set heading, / 100or<old_number_records> - <number_records_deleted> - <number_records_changed> <= <old_number_records> 100 /, <old_number_records> + <number_records_added> + <number_records_changed> >= <old_number_records>, > connect sapr3/<pwd>> @monitdata, prerequisites recommendation/additional informationprerequisite, means ofdetermining fragmented indexes, > connect sapr3/<pwd>, / 100or<new_number_records> <= <old_number_records> 100 /, br986w warnings referring
Related Notes : 
       
| 806554 | FAQ: I/O-intensive database operations | 
| 744483 | Changes in collection of statistics in BRCONNECT 6.40 | 
| 588668 | FAQ: Database statistics | 
| 517209 | BRCONNECT ignores DBA_TAB_MODIFICATIONS tables | 
| 491750 | ORA-01002 in BRCONNECT 6.10 at the tab_modif_read-7 location | 
| 403706 | Corrections in BR*Tools Version 6.10 | 
| 403704 | BRCONNECT - Enhanced function for Oracle DBA | 
| 184513 | CBO: Parallel generation of optimizer statistics |