The buffer manager is designed to enhance performance. The buffer manager uses sophisticated search and toss algorithms and is tightly integrated with the log manager. You configure buffer manager memory as a single buffer as opposed to specifying memory amounts for each database object type. This single buffer manager handles access to tables, indexes and dictionary information, and simplifies configuration by allowing more intelligent cache use. Memory is allocated by the cache manager at server start up and released at server shut down.
Use the Configuration Utility to specify the cache size at the server level, and to set the checkpoint frequency parameter, which controls periodic purging of logging system cache. See the chapter Server Configuration Utility chapter for information.