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What is the difference between data dictionary, metadata, and catalog ?

What is the difference between data dictionary, metadata, and catalog ?

1Comment
Ankit @aryakanpur
23 Oct 2015 02:09 pm

data dictionary tolds you how data represention in rdbms what tablespace user etc like in oracle we have dba_objects.

Metadata tolds about data other it help in queries ,mainly in materialized view query.

In short catalog contains metadata.

catalog->metadata->data dictionary