best performance for storage of server information for python CGI web app?

[davidj411]

I am wondering what will give me the best performance for storing
information about the servers in our environment.
currently i store all info about all servers in a single shelve file,
but i have concerns.
1) as the size of the shelve file increases, will performance suffer ?
2) what about if 2 updates occur at the same time to the shelve file?
when a shelve file is opened, is the whole file read into memory?

if either scenario (1 or 2) is true, then should i think about
creating a shelve file per server?
i was also thinking about using SQL Lite with one DB to store all the
info.
with this option, i would not have to worry about concurrent updates,
but as the file size increases, i could expect performance to suffer
again?

I am running Python 2.6 CGI scripts on Apache web server on windows
platform. they interact with the current shelve file to pull info or
request info from a python service which will go collect the info and
put it into the shelve file.