some questions about the delta operation in SVN

Can anyone help me make clear the following questions? Thanks very much.

I make some updates, and the SVN client generates the delta and sends it to
the SVN server. Does the server simply store this delta to the repository,
or do something more?

Sometimes I find the SVN client does not delta the updated version with the
latest version in the client. Is there any rule under which the client
decides which pristine version to be delta-ed against, or the client just
randomly chooses a pristine version to delta against?

Bo
Received on 2013-03-06 05:49:48 CET