Please help on BUFFERS configuration

Hello, This is the result of onstat -p: Profile dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached 55684746 62996402 402420642 86.16 585360 2321888 6684656 91.24 isamtot open start read write rewrite delete commit rollbk 158584062 4458019 16558239 84056182 1556625 188487 54974 555003 245 ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes 0 0 0 110635.37 31806.81 2896 6134 bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans 22304173 728 901103647 0 0 1076 398191 419941 ixda-RA idx-RA da-RA RA-pgsused lchwaits 5934157 2186 45893147 51743251 73950 Question: The actual BUFFERS=20000, the physical memory is 256MB RAM, I would like to increase the BUFFERS to 40000, because I have to many buffers waits and the "Read % cached" is to low (86.16). When I change the BUFFERS parameter from 20000 to 40000, in order to take effect, I need to bring down the engine (initialize), will my data be safe? Is changing this critical parameter safe? Other shared memory parameters: LOCKS 8000 # Maximum number of locks BUFFERS 20000 # Maximum number of shared buffers NUMAIOVPS # Number of IO vps PHYSBUFF 32 # Physical log buffer size (Kbytes) LOGBUFF 32 # Logical log buffer size (Kbytes)LOGSMAX 10 # Maximum number of logical log files CLEANERS 14 # Number of buffer cleaner processes SHMBASE 0x0 # Shared memory base address SHMVIRTSIZE 70000 # initial virtual shared memory segment size SHMADD 8192 # Size of new shared memory segments (Kbytes) SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited CKPTINTVL 100 # Check point interval (in sec) LRUS 14 # Number of LRU queues LRU_MAX_DIRTY 6 # LRU percent dirty begin cleaning limit LRU_MIN_DIRTY 3 # LRU percent dirty end cleaning limit LTXHWM 50 # Long transaction high water markpercentage LTXEHWM 60 # Long transaction high water mark (exclusive) TXTIMEOUT 0x12c # Transaction timeout (in sec) STACKSIZE 32 # Stack size (Kbytes) Regards. Fernando -- +----------------------------------------------------------------+ Fernando Collalti mailto:fernando.collalti@orbit.net Database Administrator http://dba.orbit.net Orbit Communications Company http://www.orbit.net Via Raffaele Costi, 60 Tel: +39 6 22543474 I-00155 Rome Fax: +39 6 22543810 ITALY Mob: +39 335 8373864 +----------------------------------------------------------------+