As per book online
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Because the Resource database file contains all system objects, an upgrade is now accomplished simply by copying the single Resource database file to the local server.
it means MS Service packs contain mssqlsystemresource.mdf/ldf and they simply replace these files
or
If i have server SP1 and want to upgrade it means i have to copy and replace the files from server with sp2.
Are above statements true?
Manish