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By default when the dal is used to create a new dataset, an existing dataset with the same name will be overwritten. This is referred to as clobbering.

If the environment variable SAS_CLOBBER is defined, to determines the clobber behaviour. It can take the following values:

no clobber: a task will produce an error when trying to overwrite an existing file.
clobber: a task will overwrite existing files. This is the default behaviour, in the event that the SAS_CLOBBER variable is undefined.

XMM-Newton SOC/SSC -- 2006-06-28