Use sp_drv_text_locator_bytelength to find the byte length of a
LOB column referenced by a text locator.
sp_drv_text_locator_bytelength accesses the Transact-SQL function
data_length.
Syntax
sp_drv_image_locator_bytelength locator, data_length
Input Parameters
locator – a text_locator that references the
text column to manipulate.
Output Parameters
data_length – an integer specifying the byte length
of the text column referenced by locator.