The architecture of a relational DBMS typically consists of a layer that manages space on disk, a layer that manages available main memory and brings disk pages into memory as needed, a layer that supports the abstractions of files and index structures, a layer that implements relational operators, and a layer that parses and optimizes queries and produces an execution plan in terms of relational operators. In addition, there is support for concurrency control and recovery, which interacts with the buffer management and access method layers.
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