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btr provides a B Tree recovery facility. Recovery of a B Tree index file may be required if it is left in an inconsistent state due to a hardware or software failure during update processing.
btr may also be used to migrate a Btree index file created with an earlier version of the Btree library to current version. Due to limited recovery information in earlier versions of the Btree index file, such migration is really only applicable to single-rooted B Tree index files.
