MSDN has a very good link that explains in simple language on how we can estimate the size of the database. The size of the database would depend on the size of the tables and the indexes. The below link gives us easy formulas that can be used to calculate the database size.
http://msdn.microsoft.com/en-us/library/ms187445
A good samaritan also created excel templates that use these formulas for database sizing.
On Oracle, you can use PL/SQL SPROCs to calculate the table and index sizes. For e.g. you have the CREATE_TABLE_COST procedure of the DBMS_SPACE package that can be used to find out the bytes required for a table. You just have to input the potential number of rows expected.
http://msdn.microsoft.com/en-us/library/ms187445
A good samaritan also created excel templates that use these formulas for database sizing.
On Oracle, you can use PL/SQL SPROCs to calculate the table and index sizes. For e.g. you have the CREATE_TABLE_COST procedure of the DBMS_SPACE package that can be used to find out the bytes required for a table. You just have to input the potential number of rows expected.
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