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2025-01-16 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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Data dictionary: the core of the database, recording the most basic information of the database
Includes basic tables (whose name ends with $, belongs to sys users, and is not allowed to modify), views (to facilitate the use of basic tables)
Dynamic performance view: stores the main activity information of the database; starts with V$
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