I'm working in postgresql-9.1.1 on windows 7 ,so i want to know what is the pre-requiest to change the shared buffer in windows 7. In my test machine i've 4gb ram. I tried to increase the shared buffer 1gb to 2gb and restart the services, but it shown the error like " the postgresql-9.1 - postgresql server 9.1 service on local computer started and then stopped.some service stop automatically if they are not in use by other services or programs ". thanks for reply