Solution : https://service.sap.com/sap/support/notes/790879 (SAP Service marketplace login required)
Key words : 
pre-installed23 sep 05   2      remove pre-installed maxdb software20 jul 05   3      linux, contents 1     general2     pre-installation3     installation4     post-installationthis note, table dd04l12 nov 04   4      missing xuser entries 1 general 01 aug 10  installation, sql_execute update statistics dd04l estimate sample 100 percentsql_execute commit 3, 2 pre-installation 23 sep 05  remove pre-installed maxdb softwareproblemyou, data load process problemthe loading processes fail, 5 build 2822 apr 05   1      high availability installation08 mar 05   2      java add-, hpia64 problemthe sap unicode kernel cd/dvd, 0 sr1 netweaver 04 sr1 22 apr 05  high availability installation, max db database users problemcertain scripts
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| 382312 | CCMS for SAP systems with SAP MaxDB >= 7.2 (7.2,..., 7.9) | 
| 39439 | XUSER entries for SAP DB and MaxDB |