Two important
pieces of RDBMS architecture are the kernel, which is the software, and the
data dictionary, which consists of the system-level data structures used by the
kernel to manage the database
You might think of an RDBMS as an
operating system (or set of subsystems), designed specifically for controlling
data access; its primary functions are storing, retrieving, and securing data.
An RDBMS maintains its own list of authorized users and their associated
privileges; manages memory caches and paging; controls locking for concurrent
resource usage; dispatches and schedules user requests; and manages space usage
within its table-space structures.
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