Solution : https://service.sap.com/sap/support/notes/561338 (SAP Service marketplace login required)
Key words : 
unmap calls                          0the data cache hit ratio, local security policy ->    local policies ->      user, 42      0x8c4     54003 dynpool  datacache num cblocks, pae mode - physical address extensions, <password> db_cons show awe number, sap db supports awe, 42      0x8c4     53000 datacach awe freephysicalpages, 42      0x8c4     53000 datacach awe freemapareapages, 4 gb ram pae / awe, logical database page numbers
Related Notes : 
       
| 560528 | Using AWE with SAP DB Version 7.4 or higher | 
| 500843 | Composite SAP note for COM and SAP liveCache 7.2 or higher | 
| 490958 | Initial parameterization of liveCache 7.4.2 and 7.4.3 | 
| 398665 | How does the liveCache < 7.4 use PSE36/AWE | 
| 112403 | SAP DB: Addressing 3GB mem. under Windows/NT/2000/2003 |