Red Hat SummitChapter 4. Networking
samba3x: New Format of the Trivial Database (TDB) Files
An update of the samba3x packages changes the format of the Trivial Database (TDB) files, and the existing TDB files are updated to conform to the new format when you upgrade your Samba packages. In addition, earlier versions of Samba are not compatible with the new TDB file format. In order to successfully downgrade to an earlier version of Samba, you must use a backed up version of your TDB files, which uses the previous formatting.
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