An address translation unit is provided for use in a computer system. The unit contains a set of page table entries for mapping from a virtual address to a packet address. Each page table entry corresponds to one page of virtual memory, and typically includes one or more specifiers. Each specifier relates to a different portion of the page, and maps from that portion of the page to a corresponding range of packet addresses. Accordingly, the unit allows for address translation to be performed with a sub-page granularity.

An apparatus and method provide virtual memory mapping and transaction management in an object-oriented database system having a database for permanently storing data, a cache memory for temporarily storing data, and a processing unit which runs application programs which request data using virtual addresses. The system performs data transfers in response to memory faults resulting from requested data not being available at specified virtual addresses and performs mapping of data in cache memory. The database includes pointers containing persistent addresses, which pointers are relocated between persistent addresses and virtual addresses. When a data request is made, either for read or write, from a client computer in a system, other client computers in the system are queried to determine if the requested data is cached and/or locked in a manner inconsistent with the requested use, and the inconsistent caching is downgraded or the transfer delayed until such downgrading can be performed.

An internet based access point management system is accessible by at least one internet web browser configured to communicate one or more requests for modifying operation of one or more computer managed openings located at one or more facilities. The internet based access point management system includes at least one computer processor having a web server operative with the at least one computer processor. The web server is configured to receive and respond to one or more requests communicated from the at least one web browser. A database server which is also operative with the at least one computer processor and an application server further operative with the at least one computer processor are also provided. The application server is configured to communicate with the web server and the database server for processing requests. The processing of requests including formulating system commands in response to the requests. A communication link is configured to connect the application server and the one or more computer managed openings for communication therebetween. The communication includes system commands which modify operation of the one or more computer managed openings. A method of managing is also presented.

A database system providing methodology for extended memory support is described. In one embodiment, for example, a method is described for extended memory support in a database system having a primary cache, the method comprises steps of: creating a secondary cache in memory available to the database system; mapping a virtual address range to at least a portion of the secondary cache; when the primary cache is full, replacing pages from the primary cache using the secondary cache; in response to a request for a particular page, searching for the particular page in the secondary cache if the particular page is not found in the primary cache; if the particular page is found in the secondary cache, determining a virtual address in the secondary cache where the particular page resides based on the mapping; and swapping the particular page found in the secondary cache with a page in the primary cache, so as to replace a page in the primary cache with the particular page from the secondary cache.