Method, system, and networked embodiments for processing PDSE extended sharing violations are provided. A single special page referred to as a “sync” page is added to the PDSE dataset. The sync page is loaded from DASD to local cache at PDSE dataset open and remains open until the last close of the PDSE dataset. The in-core version of the sync page maintains a list of index update records for all computer systems within a sysplex and the on-DASD version of the sync page maintains a list of index update records for all computer systems connected to shared DASD. By leveraging properties of the sync page, and more particularly by monitoring any divergence in the in-core and on-DASD sync pages, a PDSE error handling module can programmatically determine when a PDSE dataset has been accessed by a rogue system, diagnose the type of error associated with the rogue update, log and notice of all systems in the sysplex of the error (and eventually connected systems outside the sysplex) and, for certain types of errors, fix the PDSE dataset.
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