What does he mean by 'site'? I don't think it means 'place' here?
The transaction manager also orchestrates transaction recovery if a node or site fails. It provides generic services for the failure of a single object, the failure of a resource manager, and the failure of an entire site. The following paragraphs sketch how the transaction manager helps in system recovery. If a site fails, the TP system restarts all the resource managers. Several transactions may have been in progress at the time of the failure. The resource managers contact the transaction manager as part of their restart logic.
Transaction Processing, Gray
My guess is that it means a building or a part of a building where multiple computers are installed. g. power failure or fire.
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My guess is that it means a building or a part of a building where multiple computers are installed. The failure of an entire site could be caused by e.g. power failure or fire.