If the db shutdown abnormally, does DBMaker do instance recovery?
If DB is abnormal shutdown, maybe the page buffer data will not write into data file. After the DB started,the DBMaker server will do a recovery. The recovery will check if the data file has abnormal transaction or not. If there is a transaction that isn't commit or rollback, server will do re-do and un-do to recovery the transaction to make the DB keep in consistency.