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general such as using gdbm with pickle/shelve.
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If my program crashes with a bsddb (or anydbm) database open, it gets corrupted. How come?
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.. XXX move this FAQ entry elsewhere?
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The bsddb module is now available as a standalone package `pybsddb
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<http://www.jcea.es/programacion/pybsddb.htm>`_.
827
Databases opened for write access with the bsddb module (and often by the anydbm
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module, since it will preferentially use bsddb) must explicitly be closed using
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the ``.close()`` method of the database. The underlying library caches database
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contents which need to be converted to on-disk form and written.
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If you have initialized a new bsddb database but not written anything to it
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before the program crashes, you will often wind up with a zero-length file and
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encounter an exception the next time the file is opened.
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I tried to open Berkeley DB file, but bsddb produces bsddb.error: (22, 'Invalid argument'). Help! How can I restore my data?
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----------------------------------------------------------------------------------------------------------------------------
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.. XXX move this FAQ entry elsewhere?
844
The bsddb module is now available as a standalone package `pybsddb
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<http://www.jcea.es/programacion/pybsddb.htm>`_.
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Don't panic! Your data is probably intact. The most frequent cause for the error
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is that you tried to open an earlier Berkeley DB file with a later version of
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the Berkeley DB library.
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Many Linux systems now have all three versions of Berkeley DB available. If you
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are migrating from version 1 to a newer version use db_dump185 to dump a plain
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text version of the database. If you are migrating from version 2 to version 3
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use db2_dump to create a plain text version of the database. In either case,
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use db_load to create a new native database for the latest version installed on
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your computer. If you have version 3 of Berkeley DB installed, you should be
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able to use db2_load to create a native version 2 database.
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You should move away from Berkeley DB version 1 files because the hash file code
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contains known bugs that can corrupt your data.
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Mathematics and Numerics
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Doc/faq/library.rst
