A data dictionary is the information and metadata (The metadata includes database name, table name, column data type, and access privileges) about the data objects themselves. The data dictionary ...

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The DICTIONARY tables component is specified in the FROM clause of a SELECT statement. DICTIONARY is a reserved libref for use only in PROC SQL. Data from DICTIONARY tables are generated at run time.

Therefore it is probably better to say that the system catalog is semi-active, instead of completely active. Nevertheless, for the most part, the system catalog operates as an active data dictionary, ...

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