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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0286556 (1988-12-19) |
| 발명자 / 주소 |
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| 출원인 / 주소 |
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| 인용정보 | 피인용 횟수 : 284 인용 특허 : 0 |
A method of monitoring objects in an interactive object-oriented database system. Any of a plurality of client programs can request monitoring of attributes of objects in the database. A record is kept of update transactions initiated by a client. When the client commits the changes, any client whic
A method of monitoring objects in an interactive object-oriented database system. Any of a plurality of client programs can request monitoring of attributes of objects in the database. A record is kept of update transactions initiated by a client. When the client commits the changes, any client which has requested monitoring is notified of any change in the value of an attribute being monitored at the request of that client. The notification interrupts the client and invokes a predesignated client procedure. Overhead is minimized by creating partial view materialization paths and defining monitors ahead of time and by localizing the monitoring.
In a computer database system, a method of monitoring an object in a database in response to a request from any of a plurality of client programs, the method comprising the following steps carried out by the system: keeping a record of any request from a client to monitor an attribute of the object,
In a computer database system, a method of monitoring an object in a database in response to a request from any of a plurality of client programs, the method comprising the following steps carried out by the system: keeping a record of any request from a client to monitor an attribute of the object, the attribute depending on another attribute; keeping a record indicating interdependence relationships among the attributes; keeping a record of the value of each attribute being monitored by accessing said interdependence relationship record; during a database update session, keeping a record of any database update transactions initiated by a client; and if a client which has initiated an update transaction requests that said update transaction be stored in the database: determining which monitored attributes may have been affected by said transaction; determining whether the values of any of said attributes have changed by computing updated values form said attributes and comparing the updated values with the values in the attribute value record; and for each value which has changed, notifying any client which had requested monitoring of that attribute.
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