HELP on shared memory segments increasing in a MAD way

Hello, problems, problems, problems...... It seems that after less than 1 hour the engine collapses. With HELP from Neil Truby now is getting better(decreasing LRU_MAX_DIRTY and LRU_MIN_DIRTY) The system: HP9000 E35, 132MB RAM, Online 7.12.UC3 client/server application around 50 users was working fine with SE 5.04 and now....with OnLine... I'm taking Informix OnLine "off-line" each hour..... My parameters(continously changing and testing: LOCKS 2000 BUFFERS 40000(old=30000) NUMAIOVPS PHYSBUFF 32 LOGBUFF 32LOGSMAX 6 CLEANERS 12(old=24) SHMBASE 0x0 SHMVIRTSIZE 60000 SHMADD 8192 SHMTOTAL 0 CKPTINTVL 300 LRUS 12(old=24)LRU_MAX_DIRTY 30(old=50) Good suggestion from Neil Truby before=70 LRU_MIN_DIRTY 20(old=40) before=60 LTXHWM 50 LTXEHWM 60 TXTIMEOUT 0x12c STACKSIZE 32 I've migrated from Informix-SE 5.04 to Informix-OnLine 7.12.UC3. With SE, the system was slow, but I never had problems. Now After the users are using the system(with the same client/server application) OnLine adds new shared memory segment (size 8388608) continuosly!!! After some hours(even one), the system "sits" down and I need to take OnLine OFF Line. I'm taking the OnLine 7.12 "on-line"with the NEW above values. I've change BUFFERS from 5000 to 30000(and now to 40000)and SHMVISTSIZE from 8000 to 60000. It seems that the application that was running OK on SE, now does not release memory until it doesn't disconnetcs from the Database engine....Why???? Are my new parameters ok? HELP!!!! fernando.collalti@orbit.net