Database system having at least two host databases and a remote database, and method of synchronizing such databases
A database and mainframe technology, applied in the field of database systems, can solve problems such as work difficulties
Inactive Publication Date: 2004-04-28
OPTIS WIRELESS TECH LLC
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Problems solved by technology
The advantage of the system is that synchronization is immediate, but it also has the disadvantage of requiring an operational connection between the two calendars (i.e. the portable calendar system is within range of an infrared link or radio paging interface)
[0006] While synchronization between a single host database and a single remote database is a simple task, it becomes more difficult when there are more than two databases
Method used
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Embodiment Construction
[0016] figure 1 A database system according to the preferred embodiment of the present invention is shown. The first host processing device 100 is a desktop personal computer and has a first host database, which will be referred to below figure 2 Describe it in detail. The host database of the personal computer 100 may be, for example, a calendar, an address book, and the like.
[0017] Teleprocessing device 120 is a portable digital assistant that contains a remote database (see figure 2 ). The remote database contains a copy or version of the calendar 130, the original being stored on the personal computer 100. A user may connect portable digital assistant 120 to personal computer 100 via wireless link 102, such as a short-range radio link (eg, Bluetooth) or an infrared link.
[0018] also, figure 1 A second host processing device 110 is presented in the form of a laptop computer. Laptop 110 includes a second host database (see figure 2 ), which also includes a co...
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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.
Description
technical field [0001] The present invention relates to a database system of the type having at least two host processing devices, each with its own host database, the system further comprising a remote processing device with a remote database, the content of which is Synchronizes with the host database, so changes to any one database are propagated to the other databases. Background technique [0002] For the above terms, the host processing device may be, for example, a desktop personal computer which has a calendar or address book as its host database. Accordingly, the remote processing device may be a hand-held communicator, such as a portable digital assistant (PDA) or a mobile phone, which has a corresponding calendar or address book as its remote database. The mainframe and remote databases are designed to contain the same information, i.e. the same calendar and address book entries, and provide the user with a great deal of flexibility: when the user is in the offic...
Claims
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IPC IPC(8): G06F15/02G06F12/00G06F17/30
CPCY10S707/99952G06F17/30575G06F16/27G06F17/40
Inventor J·比尔克勒P·奥尔松L·诺瓦克
Owner OPTIS WIRELESS TECH LLC