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BDB Tables
Here follows the restrictions you have when using BDB tables:
BDB tables store in the `.db' file the path to the file as it was
created.
(This was done to be able to detect locks in a multi-user environment that
supports symlinks).
The effect of this is that BDB tables are not movable between directories!
BDB tables, you have to either use
mysqldump or take a backup of all table_name.db files and
the BDB log files. The BDB log files are the files in the base
data directory named log.XXXXXXXXXX (ten digits);
The BDB storage engine stores unfinished transactions in the log files
and requires these logs to be present when mysqld starts.