VSIZE returns the number of bytes in the internal representation of expr. If expr is
null, then this function returns null.

This function does not support CLOB data directly. However, CLOBs can be passed in
as arguments through implicit data conversion.

Examples
The following example returns the number of bytes in the last_name column of the
employees in department 10:

SELECT last_name, VSIZE (last_name) "BYTES"
FROM employees
WHERE department_id = 10;
LAST_NAME BYTES
--------------- ----------
Whalen 6

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ITPub博客

FUNCTION : vsize