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If the program is written correctly, the files will get updated.
Programs written correctly? That can be a tall order. Some Yahoo will come along and place and retain a lock on one of the records within your transaction boundary, or forget to set the SIZE parameter on your file to *NOMAX records, or mess up some other configuration directive, or push the little white button on the UPS...
I agree however that using only record-level-access methods to update files avoids most problems. You can at least test whether you can get a lock on all records within your transaction boundary before performing an update, and writes hardly ever fail.
But some SQL programmer will eventually come along and design an application to perform set oriented updates using a set oriented user interface, and things get more complicated and become less reliable.
Nathan.
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