Paul> I have the problem that my shelve(s) sometimes corrupt (looks like
Paul> it has after python has run out of threads).
Paul> I am using the default shelve so on linux I get the dbhash
Paul> version. Is there a different DB type I can choose that is known
Paul> to be more resilient? And if so, what is the elegant way of doing
Paul> that?
You don't say what version of Python you're using or what version of the
Berkeley DB library underpins your installation, but I am going to guess it
is 1.85. This has been known to have serious bugs for over a decade. (Just
in the hash file implementation. The btree and recnum formats are ok.
Unfortunately, the hash file implementation is what everybody has always
gravitated to. Sort of like moths to a flame...)
If that's the case, simply pick some other dbm file format for your shelves,
e.g.:
>>> import gdbm
>>> import shelve
>>> f = gdbm.open("/tmp/trash.db", "c")
>>> f.close()
>>> db = shelve.open("/tmp/trash.db")
>>> db["mike"] = "sharon"
>>> db["4"] = 5
>>> db.keys()
['4', 'mike']
>>> db.close()
>>> f = gdbm.open("/tmp/trash.db", "c")
>>> f.keys()
['4', 'mike']
>>> f['4']
'I5\n.'
>>> f['mike']
"S'sharon'\np1\n."
As for "uncorrupting" your existing database, see if your Linux distribution
has a db_recover program. If it does, you might be able to retrieve your
data, though in the case of BerkDB 1.85's hash file I'm skeptical that can
be done. I hope you weren't storing something valuable in it like your bank
account passwords.
--
Skip Montanaro - s...@pobox.com - http://www.smontanaro.net/
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