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I was wondering how much memory does a null value occupy in a database can anyone answer clearly?
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Nulls are stored in the database if they fall between columns with data values. In these cases, they require 1 byte to store the length of the column (zero).
Using Sparse Columns, NULL value will not consume any space regardless of using fixed-length or variable-length columns.
seems obvious, the answer would be no, null values don't take up space in pl/sql table in memory.
The DBNull class represents a nonexistent value. In a database, for example, a column in a row of a table might not contain any data whatsoever. That is, the column is considered to not exist at all instead of merely not having a value. A DBNull object represents the nonexistent column.
How much space it takes up depends on what the column is defined to be and on the storage engine being used. Some data types take a fixed amount of space regardless of the data stored. There is a small space penalty for declaring a column to accept NULL. Details can be found in this general discussion in the manual and more in the docs about each storage engine.
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