Determining When the Books Close
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When a user clicks an ad, it can take up to four hours for the system to process the click and make it available for reporting. When all clicks for the previous day have been processed and made available for reporting, this state is referred to as Books Closed. If you schedule a report that requires the previous full day of data, you should consider the three-to-four hour rolling window and the time zone of the campaign before making your request (for time zone related details, see Time Zones in Reporting).
If you request a report that includes campaigns that span multiple time zones, the data is considered complete only after all of the click data is processed for the campaign that has the westernmost time zone. For example, say you request a report that includes Campaign A, (which specifies the PST time zone) and Campaign B, (which specifies the EST time zone), the data is not complete until all of the click data for Campaign A has processed for the specified time period.
Each report request includes the ReturnOnlyCompleteData element that you can set to specify whether you want the service to generate the report only if all the data is available (has been processed) based on the aggregation, scope, and time period values that you specify. If true, the request fails if the system has not finished processing all the data based on your criteria. However, if false, the request succeeds but the report will contain only the data that the system has finished processing at the time of the request, and there is no indication as to whether the data is complete. The default value is false.