Final Answer:
In SQL Server, the row size can be calculated by summing the storage required for each column in a table, including fixed-length and variable-length columns, along with overhead for row metadata.
Step-by-step explanation:
The calculation of row size in SQL Server involves considering the storage requirements for each column within the table.
Fixed-Length Columns: For columns with fixed lengths (e.g., INT, CHAR), the storage size is constant and can be obtained from the data type.
Variable-Length Columns: For variable-length columns (e.g., VARCHAR, NVARCHAR), the storage size is based on the actual data stored and can vary.
Overhead: Additional storage is needed for row metadata, including a null bitmap to indicate null values and a status byte.
The formula for row size is the sum of storage for all columns plus overhead. It's essential to consider factors like variable-length columns, variable-length character sets, and potential row overflow data.