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A SIP-based Synchronization Server Disclosure Number: IPCOM000022498D
Original Publication Date: 2004-Apr-25
Included in the Prior Art Database: 2004-Apr-25

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In a classical Information System Software, each client is connected to the database from which it retrieves or where it stores information. The information is usually stored in the cache memory. Two problems emerge in such systems. Firstly, some pieces of information on the database could be accessed and modified by several clients at the same time. It is necessary to ensure that only one application at a time can change a data item. The adequate mechanism used by DBMS (Database Management System) for the sharing of data is concurrency control and locking. Secondly, the information stored in the memory of a client can be out of date if another client has modified the relative information on the database. This problem is referred to as cache synchronization.