memory release

Hi We are running Online 7.23UC4 on HP O/S 10.20 with 229 MB physical memory, 6 physical diskes, 1 CPU and KAIO-enabled. It seems that the Informix 7.23 requires a lot of memory. It dymanically allocates virtual memory all day long and frees very little until the user logs out. How can we free memory from a session that does not end until the user is ready to go home? We tried the onmode -F to free memory, but it does not free much. The users are complaining about the slow peformance. Sometimes it take them one or two minutes to get a next screen. Here is the onconfig information. # Root Dbspace Configuration ROOTNAME rootdbs # Root dbspace nameROOTPATH /dev/ifmx/cors1dbs # Path for device containing root dbspace ROOTOFFSET 10000 # Offset of root dbspace into device (Kbytes) ROOTSIZE 100000 # Size of root dbspace (Kbytes) # Disk Mirroring Configuration Parameters MIRROR 0 # Mirroring flag (Yes = 1, No = 0) MIRRORPATH # Path for device containing mirrored root MIRROROFFSET 0 # Offset into mirrored device (Kbytes) # Physical Log Configuration PHYSDBS phydbs # Location (dbspace) of physical log PHYSFILE 20000 # Physical log file size (Kbytes) # Logical Log Configuration LOGFILES 10 # Number of logical log files LOGSIZE 6000 # Logical log size (Kbytes) # Diagnostics MSGPATH /usr/informix/onlog.coris # System message log file path CONSOLE /usr/informix/colog.coris # System console message path ALARMPROGRAM /usr/informix/etc/log_full.sh # Alarm program path # System Archive Tape Device TAPEDEV /dev/rmt/1m # Tape device path TAPEBLK 2048 # Tape block size (Kbytes) TAPESIZE 4000000 # Maximum amount of data to put on tape (Kbytes) # Log Archive Tape Device LTAPEDEV /dev/rmt/0m # Log tape device path LTAPEBLK 16 # Log tape block size (Kbytes) LTAPESIZE 2000000 # Max amount of data to put on log tape (Kbytes) # Optical STAGEBLOB ,1 # INFORMIX-OnLine/Optical staging area # System Configuration SERVERNUM 91 # Unique id corresponding to a OnLineinstance DBSERVERNAME logan_coris # Name of default database server DBSERVERALIASES coris_soc # List of alternate dbservernames NETTYPE ipcshm,1,10,NET # Override sqlhosts nettype parameters NETTYPE soctcp,1,40,CPU # Override sqlhosts nettype parameters DEADLOCK_TIMEOUT 60 # Max time to wait of lock in distributed env. RESIDENT 1 # Forced residency flag (Yes = 1, No = 0) MULTIPROCESSOR 0 # 0 for single-processor, 1 formulti-processor NUMCPUVPS 1 # Number of user (cpu) vps SINGLE_CPU_VP 1 # If non-zero, limit number of cpu vps toone NOAGE 0 # Process aging AFF_SPROC 0 # Affinity start processor AFF_NPROCS 0 # Affinity number of processors # Shared Memory Parameters LOCKS 7000 # Maximum number of locks BUFFERS 7000 # Maximum number of shared buffers NUMAIOVPS 1 # Number of IO vps PHYSBUFF 32 # Physical log buffer size (Kbytes) LOGBUFF 32 # Logical log buffer size (Kbytes)LOGSMAX 48 # Maximum number of logical log files CLEANERS 2 # Number of buffer cleaner processes SHMBASE 0x0 # Shared memory base address SHMVIRTSIZE 160000 # initial virtual shared memory segmentsize SHMADD 8192 # Size of new shared memory segments (Kbytes) SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited CKPTINTVL 300 # Check point interval (in sec) LRUS 4 # Number of LRU queues LRU_MAX_DIRTY 30 # LRU percent dirty begin cleaning limit LRU_MIN_DIRTY 20 # LRU percent dirty end cleaning limit LTXHWM 40 # Long transaction high water markpercentage LTXEHWM 50 # Long transaction high water mark (exclusive) TXTIMEOUT 0x12c # Transaction timeout (in sec) STACKSIZE 32 # Stack size (Kbytes) WSTATS 1 # Enable wait statistics # System Page Size # BUFFSIZE - OnLine no longer supports this configuration parameter. # To determine the page size used by OnLine on your platform # see the last line of output from the command, 'onstat -b'. # Recovery Variables # OFF_RECVRY_THREADS: # Number of parallel worker threads during fast recovery or an offline restore. # ON_RECVRY_THREADS: # Number of parallel worker threads during an online restore. OFF_RECVRY_THREADS 10 # Default number of offline workerthreads ON_RECVRY_THREADS 1 # Default number of online workerthreads # Data Replication Variables # DRAUTO: 0 manual, 1 retain type, 2 reverse type DRAUTO 0 # DR automatic switchover DRINTERVAL 30 # DR max time between DR buffer flushes (in sec) DRTIMEOUT 30 # DR network timeout (in sec)DRLOSTFOUND /usr/informix/etc/dr.lostfound # DR lost+found file path # Read Ahead Variables RA_PAGES 34 # Number of pages to attempt to read ahead RA_THRESHOLD 30 # Number of pages left before next group # DBSPACETEMP: # OnLine equivalent of DBTEMP for SE. This is the list of dbspaces # that the OnLine SQL Engine will use to create temp tables etc. # If specified it must be a colon separated list of dbspaces that exist # when the OnLine system is brought online. If not specified, or if # all dbspaces specified are invalid, various ad hoc queries will create # temporary files in /tmp instead. DBSPACETEMP tempdbs # Default temp dbspaces # DUMP*: # The following parameters control the type of diagnostics information which # is preserved when an unanticipated error condition (assertion failure) occurs # during OnLine operations. # For DUMPSHMEM, DUMPGCORE and DUMPCORE 1 means Yes, 0 means No. DUMPDIR /home # Preserve diagnostics in this directory DUMPSHMEM 1 # Dump a copy of shared memory DUMPGCORE 0 # Dump a core image using 'gcore' DUMPCORE 0 # Dump a core image (Warning:this aborts OnLine) DUMPCNT 1 # Number of shared memory or gcore dumpsfor # a single user's session # ADT* # The following parameters control the type and level of secure auditing # present in the OnLine system. By default, ADTMODE is 0 and