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To make sure that inserted (distributed) rows are removed in case the batch is cancelled. This to avoid duplicated rows. To handle this, the agent inserts its batch Transaction ID in the assigned Transaction ID column. If the batch is cancelled, all rows matching the batch Transaction ID will be removed again.
If a stored procedure is used to populate the table, the configured Cleanup SP must be able to do the same, or something similar, to avoid duplicates. For further information and an example of a cleanup stored procedure, see Cleanup Stored Procedure in 9.1213.3.3 Tables and Stored Procedures.
To make sure that a potential Database collection agent does not collect rows from the target table, before the current batch is closed. To handle this, the agent populates a pending transaction table with the current Transaction ID, database and table name in the beginning of the batch and removes the entry in the end of the batch. For a detailed description of this behavior, see 9.1213.3.1 Inter-Workflow Communication, Using Database Agents.
Emits
This agent does not emit anything.
Retrieves
The agent retrieves commands from other agents and based on them generates a state change of the file currently processed.
Command | Description |
|---|---|
Begin Batch | Retrieves a Transaction ID and inserts an entry in the pending transaction table. |
End Batch | Deletes the pending Transaction ID row. |
Cancel Batch | Removes the distributed rows with the current Transaction ID or calls the configured Cleanup SP. The pending Transaction ID row is deleted. |
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