You can estimate the database size of selected tables in the model.
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Select .
The Database Size Estimation dialog box is displayed.
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Select a package from the list.
The list of tables in the currently selected package is displayed.
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Select one or more tables from the list.

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If required, repeat steps 2 and 3 until all the tables of interest have been selected throughout the model.
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Click OK.
A confirmation box is displayed asking if you want to keep all previously selected objects in the database size estimate.
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Click OK.
The output list displays the estimated database size.