Solution : https://service.sap.com/sap/support/notes/1235952 (SAP Service marketplace login required)
Key words : 
alter system set encryption wallet open identified, br0978w database profile alert - level, <degree>auto - auto sample size, standard operating system copy command, set br_scp_cmd=scp2 -q6, null - default table sample size, stats_dict_sample = <percent><percent> - 1-100default, exec_parallel = 8_red_par_exec = 2brbackup starts, archive log file-pcp, 456/319123the statistic check phase
Related Notes : 
       
| 1553243 | ORA-06564 for table validation | 
| 1366660 | BRCONNECT warning BR0978W for MAX_DUMP_FILE_SIZE | 
| 1269911 | FAQ: Chained Rows | 
| 1060305 | Corrections in BR*Tools Version 7.10 | 
| 863811 | Using BRCONNECT to collect statistics for Oracle dictionary | 
| 849483 | Corrections for BR*Tools Version 7.00 | 
| 601395 | Collecting system statistics with BRCONNECT | 
| 23345 | Consistency check of ORACLE database |