Strategy Selector: software that translates a user request into an effective form for execution.
Buffer Manager: software that controls the movement of data between main memory and disk storage.
File Manager: software that manages the allocation of storage locations and data structures.
Data Dictionary: this part of the DBMS defines the structure of user data and how they are to be used.
Main Memory: storage located in the central processing unit , used for data made and how they are to be used.
Disk Drive : Physical unit that contains the disk storage unit.
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