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In push mode, the application will take care of identifying the records for delta. The delta update reads these delta data records from the delta queue. The delta type supported is 'D', image will be AIM (After-Images Via Delta Queue)
In pull mode, the extractor provides the delta for the data source. The data source extractor determines the delta data records. The delta type supported is 'E', image will be AIE (After-Images Via Extractor)
Hence in push mode, the data will be posted to delta queue automatically by the application. Where as in pull, the extractor has the vital role in delta records
'D': The SAP application writes delta data records directly to the delta queue (“PUSH”) for the DataSource. Each data record is either a) stored in the delta queue individually on saving / updating the corresponding transactions in the application (for example, FI-AR/AP or direct delta in the LO Cockpit), or b) written in groups of delta data records (after updating the transaction) to the delta queue by means of application-specific jobs. In each case, however, the delta data records are in the delta queue for the SAP source system before the delta update is executed. In the case of a delta update for the DataSource, this delta queue is read and the data records that exist there are transferred to the BI system. This delta type is normally used in applications in which
delta data records cannot be determined through fields or control tables for
the underlying application tables.
'E': The DataSource determines the delta through the extractor on request. This means that the extractor must be capable of providing the delta records for the DataSource on request (“PULL”). The delta data records that have been determined are placed in the delta queue by the extractor and
transferred from the there to the requesting BI target system. If you have carried out delta initializations for more than one BI system, or several delta initializations for the same BI system, the extractor has to stage delta records for all the delta initializations and store them in all the delta queues that are specific to the BI target systems. This delta type is normally used in applications in which delta data records can be determined through fields or control tables for the underlying application tables (for example, time stamp information for each data record).
Go through TBW42_part 1, page num 254, for more info.
Regards
Chandu
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