Process data synchronization log process
Activity Flow

You define the paging setup in these fields of the Process data synchronization log dialog:

• Number of pages: It can be that you can run only a limited number of batch jobs in parallel or that you want to use a limited number of batch jobs. If so, define the maximum allowed number of pages. 
• Page size: You can split the to-be-processed events over several batch task. Define the number of events to be processed by one batch task.

On the pages, the events are grouped by RecId, table, and event type. So, all events of a specific event type that are logged for a unique record, are grouped on the same page. For example, if five change events are logged for customer X, these five events are grouped on one page.
Example:
The Number of pages is 4 and the Page size is 1000.
- If 1.500 logged events are processed, these are split over 2 pages.
- If 10.000 logged events are processes, these are initially split over 10 pages. However, only 4 pages are allowed. Therefore, a recalculation is done splitting the 10.000 events over the 4 allowed pages. As a result, 4 pages with each 2.500 events are processed.
Notes:

In the data synchronization log, several events can be logged for a unique record and event type combination. To prevent processing duplicate events, all logged events for a unique record and event type combination are further processed as one event. Finally, this results in only unique records in the outbound queue.

Example:
A sales order is changed several times. So, several events of type Update are logged for the sales order. When the data synchronization log is processed, these events are first grouped on one page. When the page is processed, these events are combined into one event for the sales order for further processing.

If you split logged events over pages, combining events for a unique record and event type combination is done separately for each page.

The event is only further processed for the messages and web service actions that are 'subscribed' to the table and event type.

A message has a data synchronization setup for table events. One of the records is Customer (CustTable) for which only Update is selected. If an event is logged that a:

For each applicable message, a check is done if the record, for which the event is logged, complies with the source document of the message.

Checks are done if the record complies with, for example, the applicable document record ranges and join modes.

If an event is logged for the root record of the applicable source document, the Redirect event setting is not applicable. On processing the data synchronization log, the logged event on the root record of the source document is added to the outbound queue. When the outbound queue is processed, the root record is exported. If, in the applicable document, child records are defined for the root record, these child records are exported as well.

Before a record is added to the outbound queue, a check is done if already a record exists for the unique combination of:

- Record

- Message or web service action

- Event type

- Status
If, in the outbound queue, already a record exists for the unique combination, the record is not added to the outbound queue.

On processing the data synchronization log, by default, logged events for a child record of the source document are added to the outbound queue for the root record of the source document. When the outbound queue is processed, the root record and its child records are exported.

The source document has a root record 'Sales order' and a child record 'Sales line'. An event is logged for a sales line. If Redirect event is set to 'Yes', not the logged event on the sales line is added to the outbound queue. Instead, the event is added to the outbound queue as logged on the sales order. When the outbound queue is processed, the sales order and all its sales lines are exported by the message.

On processing the data synchronization log, by default, log entries for a child record of the source document are added to the outbound queue for the root record of the source document. However, if Redirect event is set to 'No', only the logged event on the child record is added to the outbound queue. When the outbound queue is processed, the child record is exported. Based on the applicable document setup, the applicable parent records and the root record are also exported.

The source document has a root record 'Sales order' and a child record 'Sales line'. An event is logged for a sales line. If Redirect event is set to 'No', the sales line record is added to the outbound queue. When the outbound queue is processed, the sales line and the sales order are exported.