| 摘要 |
A database system has at least two hose databases (204, 214) in respective host processing apparatuses (200, 210). A remote database (224) is provided in a remote processing apparatus (220). The host databases and the remote database store a plurality of database items. A synchronization engine (206, 216) is provided in each host processing apparatus for synchronizing its host database with the remote database. A first log file (227) contains entries, that represent changes made to the remote database (224), including additions and modifications of items in the remote database as well as deletions of items from the remote database in order to increase its free storage space available for storing new items. A second log file (229) contains entries, that represent deletions from the remote database upon respective deletions in either of the host databases (204, 214). The synchronization engine (206, 216) deletes items in its host database in accordance with the entries in the second log file but not in the first log file. |
