database physical storage

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hai...

I have observed that the size of data (for example size of table in a database) stored by database system on physical storage is more than actual datasize.It seems database is storing data in some format.For example i have created a table with data 15MB considering each INTEGER of 4bytes.But after loading this data into database i have observed that database system is storing this table in 45MB memory.So can anybody tell me what is the reason to use so much memory? Is there any relation between actual dataset size and size of data stored on physical storage system.

thanks in anticipation

regards,
--
 N Praveen Kumar

	Imagination is more important than knowledge...
                                --Albert Einstein



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