Solution : https://service.sap.com/sap/support/notes/484548 (SAP Service marketplace login required)
Key words : 
solution 3 tier systems invariably display higher database response times, dbs/db4/opticonnect = 0 tcp/ip considerations, higher database response times, dbs/db4/allow_cancel = 1should, ensure problem-free operation, consistently hight cpu-usage, parameter dbs/db4/opticonnect, slower tcp/ip connections, application servers takes place, edrsql server withstrtcpsvr server
Related Notes : 
       
| 682281 | NT/DB4: Starting Win2K AppServer from iSeries Central Host | 
| 517515 | iSeries: When to use ASP balancing ? | 
| 494086 | iSeries: Cancelling long-running database operations | 
| 450351 | iSeries: Perf-problems on 3-tier or Virtual Host systems | 
| 428855 | IBM i system values | 
| 406701 | INST: iSeries: Installing 3-tier systems Rel. 6.10 | 
| 392080 | AS/400: Switching off the new Database Monitor | 
| 387085 | INST: AS/400: Installing 3-tier systems Rel.4.6C SR2 | 
| 386796 | INST: AS/400: Installing 3-tier 4.6C SR2 (ASCII) | 
| 382109 | AS/400: Switching off the new database monitor | 
| 353167 | AS/400: Work processes are permanently in MTXW status | 
| 328805 | INST: AS/400: Installing 3-tier 4.6C SR1 (ASCII) | 
| 324969 | INST: AS/400: Installing 3-tier systems Rel. 4.6C SR1 | 
| 321729 | AS/400: Additional functions for ST04 | 
| 320631 | INST: AS/400: Installing 3-tier systems Rel. 3.1I SR1 | 
| 318219 | INST: AS/400: Installing 3-tier systems Rel. 4.6D | 
| 300103 | INST: AS/400: Installing 3-tier systems Rel. 4.6C | 
| 202593 | iSeries: online backup with SAVR3SYS | 
| 139940 | INST: 4.5B R/3 Installation on IBM AS/400 | 
| 135369 | AS/400: Subsequent installation of the SQL Database Monitor | 
| 102039 | INST: AS/400: Installing 3-tier systems Rel. 3.1I | 
| 101113 | AS/400: Analysis of performance problems | 
| 99802 | INST: AS/400: Installing 3-tier systems Rel. 4.0B | 
| 93316 | AS/400: Start/stop all instances at the same time | 
| 92589 | AS/400: TCP/IP Read/Write buffer > 1 MB | 
| 60252 | iSeries: TCP/IP host name configured incorrectly | 
| 26317 | Set up for LOGON group for autom. load balancing | 
| 14754 | Profile parameters for buffer synchronization |