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>5.9. Upgrading to New Releases</H1
><P
>A plain Bugzilla is fairly easy to upgrade from one version to a
newer one. Always read the release notes to see if there are any issues
that you might need to take note of. It is recommended that you take a
backup of your database and your entire Bugzilla installation before attempting an
upgrade. You can upgrade a 'clean' installation by untarring a new
tarball over the old installation. If you are upgrading from 2.12 or
later, and have cvs installed, you can type <TT
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>cvs -z3 update</TT
>,
and resolve conflicts if there are any.
</P
><P
>However, things get a bit more complicated if you've made
changes to Bugzilla's code. In this case, you may have to re-make or
reapply those changes. One good method is to take a diff of your customised
version against the original, so you can survey all that you've changed.
Hopefully, templatisation will reduce the need for
this in the future.</P
><P
>From version 2.8 onwards, Bugzilla databases can be automatically
carried forward during an upgrade. However, because the developers of
Bugzilla are constantly adding new
tables, columns and fields, you'll probably get SQL errors if you just
update the code and attempt to use Bugzilla. Always run the
<TT
CLASS="filename"
>checksetup.pl</TT
>
script whenever you upgrade your installation.</P
><P
>If you are running Bugzilla version 2.8 or lower, and wish to
upgrade to the latest version, please consult the file,
"UPGRADING-pre-2.8" in the Bugzilla root directory after untarring the
archive.</P
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