4030 errors relate to server process errors. That is a user is running a query and the session they are running hits this 4030 error because the server is not able to allocate more memory to the process.
questions to ask:
is there sufficient memory available on the server ?
is there an operating system limit present ?
which process is requesting too much memory ?
how to collect information on what the process is doing ?
Metalink Note of interest: 233869.1