Polling For File Existence In SQL Agent

Bill Fellows gives us an example of polling for a file change using SQL Agent:

A fun question over on StackOverflow asked about using SQL Agent with SSIS to poll for a file’s existence. As the comments indicate, there’s a non-zero startup time associated with SSIS (it must validate the metadata associated to the sources and destinations), but there is a faster, lighter weight alternative. Putting together a host of TSQL ingredients, including undocumented extended stored procedures, the following recipe could be used as a SQL Agent job step.

If you’re going to limit yourself to just SQL Server-based solutions and running on a frequent schedule isn’t enough, this is one of the better options.

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