Solution : https://service.sap.com/sap/support/notes/846890 (SAP Service marketplace login required)
Key words : 
transaction db50 -> current status -> memory areas -> data area, central ccms scheduling calendar comprises transactions db13, note 352081 additional service-relevant functions, maxdb support split-mirror technology, log area- executing consistency checks, maxdb tools dbmgui/database studio, system table 'serverdbstatistics' displays information, optimizer statistics- database structure checks 7, single central scheduling calendar, processing complex sql statements
Related Notes : 
       
| 1377148 | FAQ: SAP MaxDB backup/recovery | 
| 1020860 | MaxDB/SAPDB Database does not start | 
| 990602 | FAQ: CCMS for MaxDB/SAP liveCache technology | 
| 952783 | FAQ: MaxDB high availability | 
| 940420 | FAQ: Database structure check (CHECK DATA/VERIFY) | 
| 927882 | FAQ: SAP MaxDB Update Statistics | 
| 869267 | FAQ: SAP MaxDB log area | 
| 820824 | FAQ: SAP MaxDB/liveCache technology | 
| 767598 | Available SAP MaxDB documentation | 
| 371247 | MaxDB and "Split Mirror" techniques | 
| 352081 | Additional service-relevant functions for MaxDB |