Data integrity of the control file

The CICS BAC control file on the host mainframe is the permanent storage location for all resource and default properties records that you are using to control access to CICS® resources. When you use the workstation administration client to create and maintain control records, you should consider the existence of these objects on the workstation as temporary. That is, the mainframe components of CICS BAC do not use the copies residing on the workstation during any of its processing, and because there are no locks on the host control records when the records are downloaded to a workstation, they could be made obsolete by another user modifying the same object from a different workstation.

Because records on the control file are not locked when downloaded, when you create or edit objects on the workstation, you are recommended to upload them to the control file on the host and delete them from the workstation. Note that you can make deletion after upload an automatic function by using the appropriate option on the workstation administration client preferences panel. When you need to edit an object again, download it from the host, perform the required editing, and then upload it, assuring its integrity in the control file.