Solution : https://service.sap.com/sap/support/notes/457512 (SAP Service marketplace login required)
Key words : 
l-lock pageset/partition p-lock page p-lock, parent l-lock child l-lock, views streamlined sap business warehouse processing resulting, improved log write performance---------------------------------------------------------------db2 v7 introduces, frequent hpgrbrba updates virtual storage monitoring, improved log write performance row level locking, indicators include page p-locking requests, work process synchronizing db2 statistics trace, indexes default application encoding scheme performance, support higher log write rates
Related Notes : 
       
| 776547 | DB2/zOS: DB13 upload with stored procedure DSNACCDS | 
| 765983 | DB2/zOS: Reducing number of DSNACCOR REORG recommendations | 
| 717935 | DB2/zOS: FTP replacement by Stored Procedures | 
| 555486 | DB2/390: DB2 parameter APPENSCH = EBCDIC | 
| 507824 | DB2/390 V7: Real Time Statistics and DSNACCOR | 
| 493836 | DB2/390: 6.20 Installation on z/OS, UNIX and Windows | 
| 450752 | DB2/390: Initial problems with DB2 V7 exploitation | 
| 392194 | DB2/390: DB2 V7 now supported |