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