CFDTWAIT
If you have a task waiting on resource type CFDTWAIT, the task is waiting on the coupling facility data table server for a file control request to complete. Requests to the CFDT server are normally processed synchronously. Therefore, this wait could indicate that:
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There is a high level of activity to the CFDT server
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The server is processing a request for a record that is longer than 4K bytes
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The task has issued a request for a record that is currently locked by another task within the sysplex.
Waiting on this resource can occur only for a file defined to access a coupling facility data table.