Transitioning notmuch/Xapian from 32-bit to 64-bit system

Olly Betts olly at
Tue Jul 9 23:59:49 BST 2019

On Tue, Jul 09, 2019 at 01:28:51PM -0300, David Bremner wrote:
> Thomas Schwinge <thomas at> writes:
> > sizes?).  Doing some light (read-only!) testing, it seems to work fine to
> > access the old 32-bit built Xapian "chert" database with 64-bit
> > notmuch/Xapian.  Is that (a) generally safe and expected to work fine,
> > (b) there may be issues, or (c) don't do that, or don't know?
> IIRC, Olly previously confirmed that the Xapian database is architecture
> independent.


> > (Of course, I'll eventually want to rebuild the database, to take
> > advantage of several new features both on the notmuch and Xapian sides,
> > but I'd prefer to do that later.)
> >
> It would be wise to make a backup with "notmuch dump" before going much further.

You can convert the database at the Xapian level:

However that probably doesn't allow taking advantage of all the new
notmuch features, so it's probably better to dump the tags, reindex
then restore the tags.


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