How OnLine Manages Shared Memory
Shared memory is an area of the system's memory that is available to all OnLine users. Much of the shared memory is used by buffers. Using shared memory for these buffers enables OnLine to pool its memory resources for multiple servers rather than set aside individual buffer areas for each process.
These buffers are used to buffer pages to and from the physical disk storage on the system. Only the most recently used pages are kept in the shared memory buffers. Thus, if a needed disk page is in the buffers, it will be the latest version and can be accessed quickly. As the buffers begin to fill or as the system detects the need to flush the buffers, buffered pages are written back to disk. When the system needs ...
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