Explain the characteristics of Data Files in oracle.

Explain the characteristics of Data Files in oracle.

One or more data files form a logical unit of database storage called a tablespace.

The size of the data file can't be changed once it is created.

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Define primary key and foreign key.

A column or combination of columns that identify a row of data in a table is Primary Key. A key in a table that identifies records in other table in called a foreign key.