If the following error occurs when you start mysqld after upgrading, it means that the current version of
BDBdoesn't support the old log file format:
bdb: Ignoring log file: .../log.
NNNNNNNNNN: unsupported log version #
In this case, you must delete all
BDBlogs from your data directory (the files that have names of the form
log.) and restart mysqld. We also recommend that you then use mysqldump --opt to dump your
BDBtables, drop the tables, and restore them from the dump file.
If autocommit mode is disabled and you drop a
BDBtable that is referenced in another transaction, you may get error messages of the following form in your MySQL error log:
001119 23:43:56 bdb: Missing log fileid entry 001119 23:43:56 bdb: txn_abort: Log undo failed for LSN: 1 3644744: Invalid
This is not fatal, but the fix is not trivial. Avoid dropping
BDBtables except while autocommit mode is enabled.